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• #1 ACL Tear & Injury: Symptoms & Recovery

  https://my.clevelandclinic.org/health/diseases/16576-acl-tear

  Anything that puts enough force on your knee to bend or twist it farther than its natural limit can tear your ACL. […] Anything that puts too much force on your knee can tear your ACL. ACL tears happen when your knee moves or twists more than it naturally can. […] The most common causes of ACL tears include: Sports injuries. Car accidents. Falls. […] ACL injuries and tears are very common. The ACL is the most commonly injured knee ligament. Experts estimate that between 100,000 and 200,000 people in the U.S. tear an ACL each year.

• #1 ACL injury: Symptoms, treatment, and recovery

  https://www.medicalnewstoday.com/articles/325866

  An ACL injury develops when the ACL, a ligament that links the thighbone and shinbone, stretches beyond its capacity and tears. […] More than 70% of ACL injuries occur without any contact or blow to the knee. […] Although an individual of any age and fitness level can injure their ACL, these injuries usually occur during activity and in connection with: sudden starts, stops, or changes of direction while moving; a blow to the knee, especially from the side; overstretching the knee. […] ACL injuries are more common during sports that involve a lot of twisting and turning, such as soccer, tennis, football, skiing, and basketball. […] ACL injuries are common but serious. Most of these injuries take place during sports that involve sudden starts and stops, pivoting, and jumping. Females are more at risk of ACL injuries than males.

• #1 Anterior Cruciate Ligament Knee Injury – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK499848/

  Most ACL tears occur in athletes by non-contact mechanisms, non-contact pivoting injury where the tibia translates anteriorly while the knee is slightly flexed and in valgus. A direct hit to the lateral knee has also been encountered as an injury mechanism. The most at-risk athletes for non-contact injury include skiers, soccer players, and basketball players. The most at-risk athletes for contact injury are football players. […] Multiple intra-articular and extra-articular injuries can be associated with acute ACL ruptures. Among those are meniscal tears; lateral meniscus injury in over half of acute ACL tears, whereas the medial meniscus is more involved in chronic cases. The PCL, LCL, and PLC could also be injured in association with an ACL injury. Chronic ACL deficiency seems to have deleterious effects on the knee, with the development of chondral injuries and complex unrepairable meniscal tears. Such as bucket handle medial meniscus tears.

• #1 Anterior Cruciate Ligament (ACL) Injuries – OrthoInfo – AAOS

  https://orthoinfo.aaos.org/en/diseases–conditions/anterior-cruciate-ligament-acl-injuries/

  One of the most common knee injuries is an anterior cruciate ligament (ACL) sprain, or tear. […] Athletes who participate in high demand sports like soccer, football, and basketball are more likely to injure their ACL. […] The anterior cruciate ligament can be injured in several ways: Changing direction rapidly, Stopping suddenly, Slowing down while running, Landing from a jump incorrectly, Direct contact or collision, such as a football tackle. […] Several studies have shown that female athletes have a higher incidence of ACL injury than male athletes in certain sports. It has been proposed that this is due to differences in physical conditioning, muscular strength, and neuromuscular control. Other suggested causes include differences in pelvis and lower extremity (leg) alignment, increased looseness in ligaments, and the effects of estrogen on ligament properties.

• #1 Anterior cruciate ligament (ACL) injury Information | Mount Sinai – New York

  https://www.mountsinai.org/health-library/injury/anterior-cruciate-ligament-acl-injury

  An anterior cruciate ligament injury is the over-stretching or tearing of the anterior cruciate ligament (ACL) in the knee. A tear may be partial or complete. […] An ACL injury can occur if you: Get hit very hard on the side of your knee, such as during a football tackle; Overextend your knee joint; Quickly stop moving and change direction while running, landing from a jump, or turning. […] Basketball, football, soccer, and skiing are common sports linked to ACL tears. […] ACL injuries often occur with other injuries. For example, an ACL tear often occurs along with tears to the MCL and the shock-absorbing cartilage in the knee (meniscus). […] Most ACL tears occur in the middle of the ligament, or the ligament is pulled off the thigh bone. These injuries form a gap between the torn edges, and do not heal on their own.

• #1 ACL Tears – Causes, Prevention & Treatment » Virtual Physical Therapists

  https://www.virtualphysicaltherapists.com/blog/acl-tears-causes-prevention-rehabilitation/

  The Anterior Cruciate Ligament (ACL) is one of two ligaments that cross in the middle of the knee. ACL injuries are often higher in those who participate in high-risk sports, such as basketball, football, skiing, and soccer. […] Athletes and weekend warriors who participate in sports that involve a lot of knee cutting, sudden stops, or a change in direction have a higher risk of ACL injury. Most injuries are not by contact or colliding with another player. […] Instead, non-contact injury of the ACL is the most frequent, involving a combination of knee valgus and internal rotation or dropping your knee and foot arch down and in. […] Injury to the ACL ligament is caused by high-pressure loading of the knee in a valgus and internal rotated position (inward knee with a flat foot). This stress can occur when stopping suddenly, cutting, or turning quickly, especially during sports participation.

• #1 ACL injury – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/acl-injury/symptoms-causes/syc-20350738

  The anterior cruciate ligament (ACL) is one of the key ligaments that help stabilize the knee joint. It’s most commonly torn during sports that involve sudden stops and changes in direction such as basketball, soccer, tennis and volleyball. […] ACL injuries most commonly occur during sports that involve sudden stops or changes in direction, jumping and landing such as soccer, basketball, football and downhill skiing. […] ACL injuries often happen during sports and fitness activities that can put stress on the knee: Suddenly slowing down and changing direction (cutting), pivoting with your foot firmly planted, landing awkwardly from a jump, stopping suddenly, receiving a direct blow to the knee or having a collision, such as a football tackle. […] When the ligament is damaged, there is usually a partial or complete tear of the tissue. A mild injury may stretch the ligament but leave it intact.

• #1 Causes of ACL Injuries — Ski Knee Injury Prevention

  http://www.ski-knee.com/causes

  The tearing of the ACL occurs in situations where the knees collapse inwards into a position called valgus with an extended knee, but can also occur during hyperextension, extreme internal rotation of the tibia or situations of deep knee flexion. […] The knee is the most commonly injured area in skiing, accounting for 33% of total injuries, while 38% of knee injuries involve rupturing the ACL. […] Competitive skiers, high level skiers and ski instructors have 47% likelihood of sustaining a major knee injury during their career. […] This injury can be extremely painful and debilitating, often requiring re-constructive surgery. This is followed by 9- 12 months of extensive rehabilitation. Unfortunately, those who receive reconstructive surgery have 23% chance of the injury re-occurring and are 10-times more likely to develop osteoarthritis in adulthood.

• #1 ACL (Anterior Cruciate Ligament) Injuries Guide: Causes, Symptoms and Treatment Options

  https://www.drugs.com/health-guide/acl-anterior-cruciate-ligament-injuries.html

  Overall, most ACL injuries are severe Grade IIIs, with only 10% to 28% being either Grade I or Grade II. Currently, between 100,000 and 200,000 ACL injuries occur each year in the United States, affecting approximately one out of every 3,500 Americans. Although most of these injuries are related to athletic activities, especially contact sports, about 75% occur without any direct contact with another player. […] Women who play contact sports injure their ACLs about seven times more often than men who play such sports. So far, sports medicine experts have not been able to determine why women athletes have a higher risk of ACL injuries. Some researchers believe it’s related to a slight difference in the anatomy of the knee in males and females. Others blame it on the effects of female hormones on body ligaments. Still others point to differences between females and males in skill, training, conditioning or even athletic shoes.

• #1 ACL Tear: Symptoms and Treatments for a Torn ACL | HSS

  https://www.hss.edu/condition-list_torn-acl.asp

  Tears of the anterior cruciate ligament (ACL) are quite common among athletes and active individuals of all ages. […] The ACL is particularly vulnerable to injury during pivoting or side-to-side athletic activity or as the result of impact. A torn ACL is a common injury in athletes of all levels. It is especially common in sports with a lot of leg planting, cutting and pivoting, such as soccer, basketball, skiing, and football. […] A partial or complete ACL tear (rupture) often occurs during a sudden twisting movement, in which a person stops quickly and changes direction, especially while pivoting or landing after a jump. A sudden, high-energy impact to the knee can also cause the ACL to tear. […] ACL tears that occur in conjunction with multiple other ligament injuries are usually a result of a high-energy injury, such as a car accident.

• #1 Everything You Need to Know About ACL Injuries: Causes, Treatments, and Prevention – Advanced Orthopaedics Associates, P.A.

  https://www.aoaortho.com/everything-you-need-to-know-about-acl-injuries-causes-treatments-and-prevention/

  ACL injuries can also result from accidents or falls that involve a direct impact on the knee joint, such as car accidents or tripping and falling. […] Although less common, ACL injuries can also occur gradually over time due to repetitive stress on the knee joint. This is more common in individuals who engage in activities that require repetitive knee movements, such as long-distance running or dancing.

• #1 ACL (Anterior Cruciate Ligament) Injuries Guide: Causes, Symptoms and Treatment Options

  https://www.drugs.com/health-guide/acl-anterior-cruciate-ligament-injuries.html

  An ACL injury is a sprain or tear, in which the ligament is stretched beyond its normal range. When the ACL is torn, it’s almost always due to at least one of the following patterns of injury: A sudden stop, twist, pivot or change in direction at the knee joint — These knee movements are a routine part of football, basketball, soccer, rugby, gymnastics and skiing. For this reason, athletes who participate in these sports have an especially high risk of ACL tears. […] Extreme hyperextension of the knee — Sometimes, during athletic jumps and landings, the knee straightens out more than it should and extends beyond its normal range of motion, causing an ACL tear. This type of ACL injury often occurs because of a missed dismount in gymnastics or an awkward landing in basketball. […] Direct contact — The ACL may be injured during contact sports, usually during direct impact to the outside of the knee or lower leg. Examples are a sideways football tackle, a misdirected soccer kick that strikes the knee or a sliding tackle in soccer.

• #1 Anterior cruciate ligament injuries: etiology and prevention – PubMed

  https://pubmed.ncbi.nlm.nih.gov/20160623/

  The relatively high risk of noncontact anterior cruciate ligament (ACL) rupture among female athletes has been a major impetus for investigation into the etiology of this injury. A number of risk factors have been identified, both internal and external to the athlete, including neuromuscular, anatomical, hormonal, shoe-surface interaction, and environmental, such as weather. […] Although studies have shown that biomechanic-centered prevention programs can reduce the risk of ACL injury, many questions remain unanswered. More research is needed to increase our understanding of the risk factors for ACL injury; how injury prevention programs work and can the clinical application of such programs be optimized.

• #1 Anterior cruciate ligament injury – Wikipedia

  https://en.wikipedia.org/wiki/Anterior_cruciate_ligament_injury

  Female athletes are two to eight times more likely to strain their ACL in sports that involve cutting and jumping as compared to men who play the same particular sports. Differences between males and females identified as potential causes are the active muscular protection of the knee joint, differences in leg/pelvis alignment, and relative ligament laxity caused by differences in hormonal activity from estrogen and relaxin. […] Changes in sex hormone levels, specifically elevated levels of estrogen and relaxin in females during the menstrual cycle, have been hypothesized as causing predisposition of ACL ruptures. This is because they may increase joint laxity and extensibility of the soft tissues surrounding the knee joint. Study results have shown that female collegiate athletes with concentration levels of relaxin that are greater than 6.0 pg/mL are at four times higher risk of an ACL tear than those with lower concentrations.

• #1 Anterior cruciate ligament injury – Wikipedia

  https://en.wikipedia.org/wiki/Anterior_cruciate_ligament_injury

  The relatively wider female hip and widened Q angle may lead to an increased likelihood of ACL tears in women. During puberty, sex hormones also affect the remodeled shape of soft tissues throughout the body. The tissue remodeling results in female ACLs that are smaller and will fail (i.e. tear) at lower loading forces, and differences in ligament and muscular stiffness between men and women. […] Researchers have found that female athletes often land with the knees relatively straight and collapsing inwards towards each other, with most of their bodyweight on a single foot and their upper body tilting to one side; these four factors put excessive strain on the ligaments on the knee and thus increase the likelihood of ACL tear.

• #1 ACL Injury Causes, Symptoms, Treatment | Omaha, Ne

  https://www.omahaknee.com/anterior-cruciate-ligament/

  One of the most common knee injuries is an anterior cruciate ligament sprain or tear. […] Athletes who participate in high demand sports like soccer, football, and basketball are more likely to injure their anterior cruciate ligaments. […] The anterior cruciate ligament can be injured in several ways: Changing direction rapidly Stopping suddenly Slowing down while running Landing from a jump incorrectly Direct contact or collision, such as a football tackle. […] Several studies have shown that female athletes have a higher incidence of ACL injury than male athletes in certain sports. It has been proposed that this is due to differences in physical conditioning, muscular strength, and neuromuscular control. Other suggested causes include differences in pelvis and lower extremity (leg) alignment, increased looseness in ligaments, and the effects of estrogen on ligament properties.

• #1 ACL Tear: Causes and Risk Factors

  https://www.sports-health.com/sports-injuries/knee-injuries/acl-tear-causes-and-risk-factors

  Anterior cruciate ligament (ACL) knee injuries often happen suddenly and without warning. While any active adult can sustain an ACL injury, there are certain situations, activities, and risk factors that increase the likelihood of it occurring. […] An ACL tear is usually sudden and is regularly seen in both contact and non-contact sports. It often occurs: […] Sports injuries are the most common causes of ACL tears, however, the ACL can be injured during any trauma, such as during a car accident, falling off a ladder, or missing a step on a staircase. […] While anyone can injure their ACL, certain factors can put an individual at higher risk: […] Having a risk factor does not mean a person will have an ACL injury in his or her lifetime. […] Women tend to injure their ACL more often than men because of differences in: […] Experts have recently gained a better understanding of womens jumping and landing patterns and how they relate to ACL injuries. A particularly vulnerable and common landing position for ACL tears involves the knee and hip in an extended (straight) position when the athlete forcefully places an inward, or valgus, force on the knee. […] Recent attention has focused on prevention of ACL injuries, especially in young females who participate in high-risk sports. […] While some athletes wear knee braces to prevent ACL injuries, current clinical evidence does not support their use in ACL prevention.

• #1 The Risks and Causes of ACL Injury and How You Can Prevent Them » ForeverFitScience

  https://foreverfitscience.com/advice/the-risks-and-causes-of-acl-injury-and-how-you-can-prevent-them/

  Poor core strength and trunk control have previously been identified as a risk factor for ACL injury, as has single leg postural control both of which relate to your capacity to move and control your body during powerful athletic tasks. […] Similarly, lower limb muscular strength imbalances have also been shown to impact ACL injury risk. […] More specifically, the relative weakness of the hamstrings compared to the quadriceps can result in increased forward translation of the tibia on the femur, which as we know, can place the ACL under increased load. […] Similarly, weakness of the muscles that act on the hip (think gluteus medius, gluteus maximus, and the external rotators) can allow the knee to rotate inwards, which again, contributes to the acute incidence of ACL injury. […] In conjunction with the above, asymmetrical lower body strength has also been identified as a potential risk factor for ACL injury.

• #1 ACL Injuries in Young Athletes: Risk Factors and Prevention | Patient Education | UCSF Benioff Children’s Hospitals

  https://www.ucsfbenioffchildrens.org/education/acl-injuries-in-young-athletes-risk-factors-and-prevention

  Some ACL injuries are simply bad luck for example, two players colliding on the field. However, sports medicine experts have identified several factors that may raise an athlete’s risk of an ACL tear. […] Individual risk factors for an ACL injury include: […] ACL tears are more common in females than males. Several anatomical features of female bodies increase strain on the knee and consequently the ACL. […] Greater joint and ligament laxity: Some of this looseness is genetic, and some may be due to hormones, such as estrogen. Laxity makes the ACL tissue more susceptible to tearing. […] Athletes with poor proprioception or neuromuscular control have higher rates of ACL injury. […] Poor landing mechanics can dramatically raise the risk of an ACL injury, specifically landing with: […] Having excessively strong quadriceps (muscles in the front of the thighs) and weak hamstrings (muscles in the back of the thighs) pulls the shinbone forward from its natural position, increasing the risk of an ACL injury. […] Receiving a blow to the leg isn’t under an athlete’s control. […] Studies have shown that dry weather increases the friction between athletic shoes and the ground. […] Compared with a natural surface, artificial turf creates more friction between shoes and the ground.

• #1 ACL Injury Etiology in Its Context: A Systems Thinking, Group Model Building Approach

  https://www.mdpi.com/2077-0383/13/16/4928

  A recent meta-analysis found 19 risk factors for ACL injury in female team sports players, suggesting that only three are influential. These factors included previous ACL injury, bipedal increased postural sway during a 30 s stance with eyes open, and increased body mass. However, it appears that factors do not behave as significant when studied in isolation and may prove of significant impact on injury occurrence when they are examined in combination with each other. For example, a coexisting excessive lateral trunk excursion during landing along with knee valgus during a single leg drop vertical jump was a significant predictor of knee injury in female athletes. Furthermore, athletes with a combination of decreased notch width, increased anteroposterior laxity, and increased body mass index presented a relative risk 21.3 times compared with controls, while these variables, when studied in isolation, had a relative risk of 3.8, 2.6, and 2.0, respectively.

• #1 Physical therapy in Baltimore for Knee – 5468

  https://www.eagletherapy.org/Injuries-Conditions/Knee/FAQs/Can-you-give-me-a-quick-overview-of-what-causes-ACL-injuries/a~5468/article.html

  As you have found out the hard way, anterior cruciate ligament (ACL) injuries are more common than athletes would like and can be very disabling. They can take a long time to heal and rehab. An injury forceful enough to rupture a ligament like the ACL can also cause damage to other soft tissues in the knee making recovery an even greater challenge. For an overview, it may be helpful to recognize that there are many identified causes of ACL injuries. Most are multifactorial meaning there is more than one factor increasing the risk of ACL injury. Two broad categories for these risk factors are: intrinsic risk factors and extrinsic factors. […] Anything intrinsic refers to the patient or affected individual. Intrinsic risk factors potentially contributing to ACL injuries include sex (male or female), hormones, genetic factors, and anatomy. Females are at greater risk than males for ACL injuries for a combination of reasons including anatomy and hormone shifts. Previous injury(ies) to the leg (especially the knee) is also an important risk factor. Anatomical and neuromuscular features play a big role in ACL injuries. Variables such as knee geometry, alignment, and joint laxity are half the problem. Knee geometry refers to three specific measures of shape, depth, and angle that have been linked with ACL injuries. These include decreased intercondylar femoral notch size, decreased depth of concavity of the medial tibial plateau, and increased slope of the tibial plateaus.

• #1 Understanding ACL Tears: Comprehensive Guide to Symptoms, Treatments, and Recovery – Plancher Orthopedics

  https://plancherortho.com/understanding-acl-tears-comprehensive-guide-to-symptoms-treatments-and-recovery/

  Intriguingly, around 70% of all cases involving torn ACLs occur without direct contact. Instead, they happen when deceleration is paired with twisting motion. […] The risk is elevated by certain physical factors including narrower notch widths at the knee joint and increased tibial slopes that make individuals more prone to these types of injuries. […] Grasping the factors that lead to ACL injuries and how they are treated is just as vital as taking steps to prevent them. Year-long commitment to training, involving both strength-building and flexibility exercises, plays a key role in enhancing balance and coordination — important aspects for minimizing the likelihood of suffering from ACL injuries.

• #1 Understanding ACL Injuries: Causes and Risk Factors – UNIQ Physical Therapy

  https://uniqphysicaltherapy.com/understanding-acl-injuries-causes-and-risk-factors/

  ACL injuries are all too common, sidelining athletes and affecting everyday individuals alike. But what exactly causes these injuries, and are you at risk? […] This severe type of ACL injury often happens when you suddenly slow down, change direction, or land awkwardly after a jump. Contact sports like football and soccer increase the risk of this type of injury. […] A sprain occurs when the ligament stretches beyond its normal capacity, causing partial tearing. This can happen due to a sudden twist or direct blow to the knee. […] Several factors can increase your risk of ACL injuries: […] Women are more likely to experience ACL injuries than men, possibly due to differences in anatomy, muscle strength, and hormonal influences. […] High-risk sports like soccer, football, basketball, and skiing involve sudden stops, jumps, and changes in direction, increasing the risk of ACL injuries. […] Weak muscles around the knee and poor overall fitness can make the ACL more vulnerable to injury. […] Landing with your knee straight or collapsing inward increases the stress on the ACL. […] If you’ve injured your ACL before, you’re at higher risk of injuring it again.

• #1 ACL Injuries Causes, Symptoms, and Treatments

  https://www.upmc.com/services/orthopaedics/conditions/acl-injury

  ACL injuries can happen to anyone and can be a game-changer, especially for athletes. […] What causes an ACL injury? Any motion that causes your knee joint to move outside its natural range of motion can lead to an ACL tear or injury. This type of injury occurs more often in activities with: Stop/start motions. Pivoting. Rapid direction changes. […] Like other body parts, the ACL tends to weaken with age. People over age 40 may be more susceptible to ACL tears. […] An ACL sprain or tear isn’t limited to athletes, although many are at a higher risk because of the sport they play. An ACL injury can happen to anyone. […] ACL tears occur more often in athletes who play high-intensity sports, such as: Football. Basketball. Soccer. […] Sports like these involve quick, frequent movements like jumping, stopping, and changing direction, which can put you at higher risk for an ACL injury.

• #1 ACL injuries causes treatment – Mayo Clinic Health System

  https://www.mayoclinichealthsystem.org/hometown-health/speaking-of-health/acl-injuries-causes-treatment

  You may have just injured or torn your anterior cruciate ligament, or ACL. […] The factors that can lead to an ACL injury include: […] Athletic activity — Participating in sports, such as soccer, football, basketball, gymnastics or downhill skiing. […] Conditioning — Poor conditioning increases the risk of injury. […] Field surface — Playing on artificial turf compared to other surfaces like grass since your foot can become more securely planted. […] Gender — Women are more susceptible to ACL tears due to knee anatomy, muscle strength and hormonal influence. […] Sports gear — Wearing footwear that doesn’t fit properly or using poorly maintained sports equipment increases the risk of injury.

• #1 ACL Injuries: What are the Possible Causes? | BJIOS Orthopaedics

  https://www.bjios.sg/acl-injuries-what-are-the-possible-causes/

  In the majority of the cases, an ACL injury can be attributed to any of the following injury patterns: […] A drastic stop, pivot, change in direction, and twist at the knee joint. These knee movements are often considered a routine part in sports like rugby, gymnastics, football, basketball, soccer, and skiing. Understandably, athletes who are involved in the aforementioned sports are highly susceptible to ACL tears. […] Extreme knee hyperextension. In some cases, during athletic landings and jumps, the knee extends beyond its limit or is straightened more than it should. Similar scenarios may sometimes result in ACL tears. For instance, ACL tears can occur when landing awkwardly while playing basketball or missing a dismount when landing in gymnastics. […] Direct contact. The ACL can get injured during contact sports especially when there is a direct impact to the outside of the lower leg or the knee. A misdirected soccer kick that hits the knee, a sliding tackle while playing soccer and a sideways football tackle are some of the likely ways the ACL can get injured. A sideways fall while skiing also commonly injures the ACL.

• #1 ACL Tears – Causes, Prevention & Treatment » Virtual Physical Therapists

  https://www.virtualphysicaltherapists.com/blog/acl-tears-causes-prevention-rehabilitation/

  Factors associated with an increased risk include: Poor running mechanics – knee valgus, pronation, heel inward during swing; Participation in sports activities that requires cutting and pivoting; Age 14 -25; Female; Decreased physical condition; Fatigue – causes poor mechanics; Wearing ill-fitted footwear or improper equipment; Playing on artificial turf. […] The number one position of the knee when the ACL tears is valgus and internal rotation (inward with foot pronated). Athletes should be evaluated and learn about this faulty mechanic when they are young, especially females. […] Tired athletes are more likely to use poor mechanics, especially when they are making a split-second decision to execute an unexpected move. […] Studies show that specific training programs can improve athletes’ running form, leg strength, and jump-landing techniques. The techniques that improve ACL safety can also enhance performance and increase vertical jump height, acceleration, and the ability to change direction, as well as reduce overuse injuries.

• #1 ACL Tears: Symptoms, Causes, & Treatment | Pinnacle Orthopaedics

  https://www.pinnacle-ortho.com/acl-tears-and-treatment-options

  While ACL tears are often unavoidable, certain measures can help reduce the risk of sustaining such injuries: Proper warm-up and stretching: Always warm up before engaging in physical activity, and incorporate dynamic stretching to prepare the muscles and joints for movement. Strength training: Focus on building strength in the muscles surrounding the knee, particularly the quadriceps, hamstrings, and calves, to provide better support and stability to the joint. Technique and form: Learn and practice proper techniques for sports and activities to minimize the risk of awkward movements or sudden changes in direction that could lead to injury. Use protective gear: Wear appropriate protective gear, such as knee braces or padding, especially during high-risk activities or sports with a high incidence of ACL injuries. Cross-training: Incorporate a variety of activities into your fitness routine to avoid overuse injuries and maintain overall strength and flexibility.

• #1 Reddit – The heart of the internet

  https://www.reddit.com/r/nfl/comments/9fsxab/oc_3_potential_underlying_causes_of_the_nfls_acl/

  Hey everyone, Im back and on the latest edition I explore three potential underlying causes of one unfortunate reality that comes with the start of summer OTAs and camps, ACL tears. […] ACL tears have become a common reality for NFL players and hopefuls as they get back to OTAs and minicamps, known as phase 3 of the NFL offseason. […] The majority of these ACL tearsnearly 73 percent according to a recent studyare non-contact injuries. Unlike a contact ACL injury where blunt force trauma to the knee or surrounding area stresses the ACL beyond its capacity, a non-contact ACL tear points to to some underlying cause(s). […] If the workload ratio of Los Angeles Chargers Hunter Henry, who tore his ACL on the first day of OTAs, was out of whack as he transitioned from his summer programming to Chargers OTAs, that would increase his risk for increased soft tissue injury, which includes ligament injuries, five times.

• #1 Four reasons for rising ACL tears and other knee injuries | Northwell Health

  https://www.northwell.edu/orthopaedic-institute/news/insights/four-reasons-for-rising-acl-tears-and-other-knee-injuries

  Skeletal immaturity and decreased knee strength. How and when children play youth sports has changed. Long gone are the days of playing multiple sports to keep you busy. Instead, there is more pressure on these young student athletes to develop specific skills in one given sport, forcing them to play all year round. The fear is that if you don’t constantly develop these skills, you will not be able to obtain a scholarship or play at a higher level. Its created a problem because those participating in just one activity sustain more trauma on the same muscles and joints. Their bodies are just not fully developed and are not strong enough to withstand the impact. […] Injury prevention training is critical given the intensity of sport, especially for those between ages 8-23 playing the same game all year. Athletes need to properly prepare for high-intensity activity well before taking the field.

• #1 Anterior cruciate ligament (ACL) injury: MedlinePlus Medical EncyclopediaLock

  https://medlineplus.gov/ency/article/001074.htm

  An anterior cruciate ligament injury is the over-stretching or tearing of the anterior cruciate ligament (ACL) in the knee. A tear may be partial or complete. […] Women are more likely to have an ACL tear than men. […] An ACL injury can occur if you: Get hit very hard on the side of your knee, such as during a football tackle; Overextend your knee joint; Quickly stop moving and change direction while running, landing from a jump, or turning. […] Basketball, football, soccer, and skiing are common sports linked to ACL tears. […] ACL injuries often occur with other injuries. For example, an ACL tear often occurs along with tears to the MCL and the shock-absorbing cartilage in the knee (meniscus). […] Most ACL tears occur in the middle of the ligament, or the ligament is pulled off the thigh bone. These injuries form a gap between the torn edges, and do not heal on their own.

• #1 ACL Injury: Does It Require Surgery? – OrthoInfo – AAOS

  https://orthoinfo.aaos.org/en/treatment/acl-injury-does-it-require-surgery/

  The ACL is one of the most commonly injured ligaments of the knee. […] Approximately half of ACL injuries occur along with damage to the meniscus, articular cartilage, or other ligaments. […] About half of ACL injuries occur in combination with damage to the meniscus, articular cartilage (the smooth cartilage that covers the ends of bones), or other ligaments. […] Secondary (related) damage may occur in patients who have repeated episodes of instability due to ACL injury. […] Complete ACL tears have a much less positive outcome without surgery. […] Some patients with partial ACL tears may still have instability symptoms. […] There is increasing evidence that children with ACL tears are at high risk for future damage to the meniscus or cartilage with nonsurgical management. […] It is common to see ACL injuries combined with damage to the menisci, articular cartilage, collateral ligaments, joint capsule, or a combination of the above.

• #1 ACL Tear: Symptoms and Treatments for a Torn ACL | HSS

  https://www.hss.edu/condition-list_torn-acl.asp

  Active, young, females experience a higher incidence of ACL injuries than males of the same age because of a multitude of factors, including landing mechanics, anatomy of the knee joint, inherent looseness of tissues. […] ACL injuries are also common in children, especially as youth sports become increasingly competitive. […] The long-term outcome for patients who are treated nonsurgically varies. Those who return to unrestricted activity are likely to experience some knee instability with side to side or pivoting movements. […] Without surgery, however, there is an increased risk of developing knee osteoarthritis.

• #1 ACL Injury: Does It Require Surgery? – OrthoInfo – AAOS

  https://orthoinfo.aaos.org/en/treatment/acl-injury-does-it-require-surgery/

  In young children or adolescents with ACL tears, early ACL reconstruction creates a possible risk of growth plate injury, leading to bone growth problems. […] Chronic instability due to rupture or stretching of the reconstructed ligament or poor surgical technique is possible. […] Growth plate injury. In young children or adolescents with ACL tears, early ACL reconstruction creates a possible risk of growth plate injury, leading to bone growth problems.

• #1 Mastering the Game: Deconstructing Anterior Cruciate Ligament Injuries in Sports – Causes, Treatments, and Prevention Strategies – The Cruciates

  https://thecruciates.com/mastering-the-game-deconstructing-anterior-cruciate-ligament-injuries-in-sports-causes-treatments-and-prevention-strategies/

  ACL injuries have the potential to derail careers and significantly impact an athletes quality of life. […] A significant number of ACL injuries in sports occur without direct contact with another player. Non-contact mechanisms typically involve abrupt changes in direction or landing from a jump. These movements place immense stress on the ACL, leading to injury. […] In high-impact sports like football, rugby, and basketball, direct collisions, tackles, or awkward falls can result in ACL injuries. The force exerted during these impacts can overstretch or completely tear the ligament, leading to significant knee instability. […] Repeated stress on the ACL without adequate rest and recovery can gradually weaken the ligament. Athletes who push their limits without proper recovery time may experience ligament strain, increasing the risk of a complete tear during intense activities.

• #1

  https://www.gleneagles.com.sg/conditions-diseases/acl-tear/symptoms-causes

  An anterior cruciate ligament (ACL) injury is commonly called an ACL tear. […] ACL tears commonly occur during sports and fitness activities that involve: […] Your risk of getting an ACL tear is higher if you: […] Play sports that involve start-stop movements, pivoting or sudden changes in direction, as these movements cause the knee to twist or turn. […] If you have an ACL tear, you have a significantly higher risk of developing knee arthritis. […] This increased risk remains regardless of whether the tear was surgically repaired. […] Experts believe that the inflammatory response of the knee to the injury itself contributes to arthritis.

• #1 ACL Injuries Causes, Symptoms, and Treatments

  https://www.upmc.com/services/orthopaedics/conditions/acl-injury

  Female athletes are especially at risk for ACL tears. […] Reinjury is the most common complication of an ACL tear. If you’ve already torn your ACL and you play sports regularly, you’re more likely to injure it again. […] If left untreated, ACL injuries may result in ongoing joint and mobility issues later in life.

• #1

  https://www.nhs.uk/conditions/knee-ligament-surgery/

  If you tear the anterior cruciate ligament (ACL) in your knee, you may need to have reconstructive surgery. […] ACL injuries are one of the most common types of knee injuries. […] You can tear your ACL if your lower leg extends forwards too much. It can also be torn if your knee and lower leg are twisted. […] Common causes of an ACL injury include: landing incorrectly from a jump, stopping suddenly, changing direction suddenly, having a collision, such as during a football tackle. […] If the ACL is torn, your knee may become very unstable and lose its full range of movement.

• #1

  https://www.advocatehealth.com/health-services/orthopedic-center/specialties/knee/acl-tear

  Factors such as poor conditioning, improper training techniques and inadequate footwear can also increase the risk of an ACL tear. […] Ignoring a torn ACL can lead to ongoing knee instability, making you more prone to additional injuries, including a meniscus tear. Chronic instability can also hinder your ability to engage in physical activities and increase your risk of developing arthritis. Timely treatment is crucial to prevent these complications and preserve knee function.

• #1 ACL Injury Etiology in Its Context: A Systems Thinking, Group Model Building Approach

  https://www.mdpi.com/2077-0383/13/16/4928

  The proposed CLD-ACLI model revealed a series of interesting complex nonlinear interrelationships causal loops between the likelihood of ACL injury and the number of risk factors. Particularly, the interaction among institutional, psychological, neurocognitive, neuromuscular, malalignment factors, and trauma history seem to affect neuromuscular control, which subsequently may alter the biomechanics of landing, predisposing the ACL to injury. Further, according to the proposed CLD-ACLI model, the risk for injury may increase further if specific environmental and anatomical factors affect the shear forces imposed on the ACL. […] The proposed ACLI-CLD constitutes a rigorous conceptual presentation of the dynamic interactions between the intrinsic and extrinsic factors that contribute to ACL injury. It may visually be observed through the proposed ACLI-CLD model that institutional, psychological, neurocognitive, neuromuscular, malalignment factors and trauma history affect neuromuscular control, which may alter the biomechanics of landing, predisposing the ACL to injury. The proposed model also suggests that the risk can increase further if specific environmental and anatomical factors affect the shear forces imposed on the ACL synthesizing a complex framework for the ACL injury etiology.

• #1 Anterior cruciate ligament (ACL) injury: MedlinePlus Medical EncyclopediaLock

  https://medlineplus.gov/ency/article/001074.htm

  Use proper techniques when playing sports or exercising. Some college sports programs teach athletes how to reduce stress placed on the ACL. This involves a series of warm up exercises and jumping drills. There are jumping and landing exercises that have been shown to reduce ACL injuries. […] The use of knee braces during vigorous athletic activity (such as football) is controversial. It has been shown to reduce the number of certain knee ligament injuries, but not specifically ACL injuries.

• #1 ACL Injuries in Football: Causes, Treatment, Prevention | HSS

  https://www.hss.edu/article_acl-injuries-football.asp

  Injuries to the anterior cruciate ligament, or ACL, are the most common major knee injuries in football. Interestingly, the damage usually occurs without contact with another player, but because of a sudden change in direction, says Robert Marx, MD, an attending orthopedic surgeon at HSS with special expertise in knee and shoulder surgery. […] Injuries often occur when a player plants their foot on the ground and attempts to rotate their body in relation to that planted foot, placing their weight on it. These motions create a twisting force across the knee joint that the ACL must absorb. When the ACL cannot cope with this force, it ruptures. […] Many of these injuries that occur without contact can be prevented with exercises in particular those that focus on balance, strength and plyometrics such as planks, Nordic hamstrings and squats.

• #1 Common Causes of ACL Injuries | Texas Orthopaedic Associates

  https://www.txorthopaedic.com/blog/common-causes-of-an-acl-injury/

  Playing sports is a great way to stay in shape and socialize. However, it’s not a good idea to go from zero to 60 when it comes to working out and getting competitive. It’s essential to start slow and build up to working hard when you start playing in a rec league or taking up a sport for fun and fitness. Working out hard when your body is not in shape can increase your risk of all types of injuries, including ACL tears or strains. […] It’s important to wear sneakers or other types of footwear, such as cleats, that fit properly and are comfortable. Wearing worn-out sneakers or improper footwear can result in strain on your joints and ligaments as well as falling or tripping. […] Another common cause of ACL injuries is getting hit in the knee, especially if your knee is overextended. This can result from a tackle, collision, or any kind of trauma on or off the field or court.

• #2 ACL (Anterior Cruciate Ligament) Injuries Guide: Causes, Symptoms and Treatment Options

  https://www.drugs.com/health-guide/acl-anterior-cruciate-ligament-injuries.html

  Overall, most ACL injuries are severe Grade IIIs, with only 10% to 28% being either Grade I or Grade II. Currently, between 100,000 and 200,000 ACL injuries occur each year in the United States, affecting approximately one out of every 3,500 Americans. Although most of these injuries are related to athletic activities, especially contact sports, about 75% occur without any direct contact with another player. […] Women who play contact sports injure their ACLs about seven times more often than men who play such sports. So far, sports medicine experts have not been able to determine why women athletes have a higher risk of ACL injuries. Some researchers believe it’s related to a slight difference in the anatomy of the knee in males and females. Others blame it on the effects of female hormones on body ligaments. Still others point to differences between females and males in skill, training, conditioning or even athletic shoes.

• #2 ACL Ruptures: Causes and Impact

  https://www.drandrewdutton.com/blog/acl-ruptures/

  Studies show that a staggering 82.4% of ACL tears are caused by sports-related activities, with non-contact injuries making up 72.5% of these cases (Surg, 2017). […] ACL injuries mostly happen without direct contact, making up about 70-80% of all cases (Orthop, 2016). They usually occur during sudden stops or quick pivots, especially when the foot is firmly planted. […] Most ACL tears happen without direct physical impact, highlighting how delicate this important ligament can be. These injuries often occur during specific movements that strain the knee excessively. For example, sudden stops combined with quick changes in direction, especially during cutting movements. […] Certain sports put athletes at a higher risk of ACL injuries. Activities like basketball, soccer, football, and skiing, which involve sudden directional changes, quick stops, and intense jumping movements, are particularly challenging for the ACL. The risk is even more significant during competitive games when athletes push their bodies to the limit.

• #2 Epidemiology, Injury Mechanism, and Etiology of ACL Injuries | SpringerLink

  https://link.springer.com/10.1007/978-3-031-29430-3_30

  With an estimated annual incidence of 120,000 in the United States, anterior cruciate ligament (ACL) injuries are commonly encountered in athletes of all skill levels. […] The etiology of ACL tears is multifactorial, with varying contributions from variations in landing mechanics, anatomy of the ACL and intercondylar notch, hormonal effect on ligamentous laxity, as well as neuromuscular control and strength of the core muscles, hip abductors, and hamstrings. […] The majority of ACL tears are noncontact injuries occurring during landing, pivoting, or cutting. The typical mechanism is an abrupt axial force applied to a slightly flexed knee causing a dynamic valgus moment with internal tibial rotation.

• #2 ACL Injuries Causes, Symptoms, and Treatments

  https://www.upmc.com/services/orthopaedics/conditions/acl-injury

  ACL injuries can happen to anyone and can be a game-changer, especially for athletes. […] What causes an ACL injury? Any motion that causes your knee joint to move outside its natural range of motion can lead to an ACL tear or injury. This type of injury occurs more often in activities with: Stop/start motions. Pivoting. Rapid direction changes. […] Like other body parts, the ACL tends to weaken with age. People over age 40 may be more susceptible to ACL tears. […] An ACL sprain or tear isn’t limited to athletes, although many are at a higher risk because of the sport they play. An ACL injury can happen to anyone. […] ACL tears occur more often in athletes who play high-intensity sports, such as: Football. Basketball. Soccer. […] Sports like these involve quick, frequent movements like jumping, stopping, and changing direction, which can put you at higher risk for an ACL injury.

• #2 Anterior cruciate ligament (ACL) injury: MedlinePlus Medical EncyclopediaLock

  https://medlineplus.gov/ency/article/001074.htm

  An anterior cruciate ligament injury is the over-stretching or tearing of the anterior cruciate ligament (ACL) in the knee. A tear may be partial or complete. […] Women are more likely to have an ACL tear than men. […] An ACL injury can occur if you: Get hit very hard on the side of your knee, such as during a football tackle; Overextend your knee joint; Quickly stop moving and change direction while running, landing from a jump, or turning. […] Basketball, football, soccer, and skiing are common sports linked to ACL tears. […] ACL injuries often occur with other injuries. For example, an ACL tear often occurs along with tears to the MCL and the shock-absorbing cartilage in the knee (meniscus). […] Most ACL tears occur in the middle of the ligament, or the ligament is pulled off the thigh bone. These injuries form a gap between the torn edges, and do not heal on their own.

• #2 What Is an ACL Tear? Symptoms, Causes, Diagnosis, Treatment, and Prevention

  https://www.everydayhealth.com/acl-tear/guide/

  ACL injuries tend to happen more often in people who play high-impact sports where rapid pivoting and turning are common, such as basketball, football, skiing, and soccer. Roughly 70 percent of ACL tears happen without direct contact to the knee. […] In these instances, the tears tend to happen when a person is running and quickly changes direction, suddenly twists or cuts, or if they hyperextend their knee coming down from a jump. […] The rest of ACL tears result from direct contact with an object or perhaps with another player while engaged in a sport. An example might be taking a direct hit to the knee during a football tackle. […] There are a number of factors that increase your risk of an ACL injury, including: Being female (it may be that hormonal differences and differences in muscle strength play a role), Playing soccer, football, or basketball, Participating in gymnastics or downhill skiing, Insufficient conditioning, Playing with worn and poorly adjusted equipment, Wearing improperly fitted footwear, Playing on artificial turf. […] The higher rates among females could be due to differences in physical conditioning and muscular strength. Other possible factors include differences in pelvis and leg alignment, increased looseness in ligaments, and the effects of estrogen on ligaments.

• #2 Anterior cruciate ligament (ACL) injury Information | Mount Sinai – New York

  https://www.mountsinai.org/health-library/injury/anterior-cruciate-ligament-acl-injury

  An anterior cruciate ligament injury is the over-stretching or tearing of the anterior cruciate ligament (ACL) in the knee. A tear may be partial or complete. […] An ACL injury can occur if you: Get hit very hard on the side of your knee, such as during a football tackle; Overextend your knee joint; Quickly stop moving and change direction while running, landing from a jump, or turning. […] Basketball, football, soccer, and skiing are common sports linked to ACL tears. […] ACL injuries often occur with other injuries. For example, an ACL tear often occurs along with tears to the MCL and the shock-absorbing cartilage in the knee (meniscus). […] Most ACL tears occur in the middle of the ligament, or the ligament is pulled off the thigh bone. These injuries form a gap between the torn edges, and do not heal on their own.

• #2 ACL (Anterior Cruciate Ligament) Injuries Guide: Causes, Symptoms and Treatment Options

  https://www.drugs.com/health-guide/acl-anterior-cruciate-ligament-injuries.html

  An ACL injury is a sprain or tear, in which the ligament is stretched beyond its normal range. When the ACL is torn, it’s almost always due to at least one of the following patterns of injury: A sudden stop, twist, pivot or change in direction at the knee joint — These knee movements are a routine part of football, basketball, soccer, rugby, gymnastics and skiing. For this reason, athletes who participate in these sports have an especially high risk of ACL tears. […] Extreme hyperextension of the knee — Sometimes, during athletic jumps and landings, the knee straightens out more than it should and extends beyond its normal range of motion, causing an ACL tear. This type of ACL injury often occurs because of a missed dismount in gymnastics or an awkward landing in basketball. […] Direct contact — The ACL may be injured during contact sports, usually during direct impact to the outside of the knee or lower leg. Examples are a sideways football tackle, a misdirected soccer kick that strikes the knee or a sliding tackle in soccer.

• #2

  https://www.advocatehealth.com/health-services/orthopedic-center/specialties/knee/acl-tear

  ACL injuries can be debilitating, affecting your ability to perform everyday activities and participate in sports. […] An ACL injury occurs when the anterior cruciate ligament (ACL) suffers a strain or a complete tear, as seen in the image. […] ACL injury refers to damage to the anterior cruciate ligament (ACL), one of the key ligaments in your knee that connects the femur (thigh bone) to the tibia (shin bone). […] An ACL injury, commonly referred to as an ACL tear, can range from a minor sprain (stretch in ligament) to a complete ACL tear, significantly impacting your ability to perform daily activities and participate in sports. […] ACL tears commonly occur during sports that involve rapid changes in direction, jumping or sudden stops, such as basketball, baseball, football and skiing. These injuries can also result from direct trauma to the knee or accidents that cause the knee to twist or hyperextend unnaturally.

• #2 Why Did My ACL Tear?: W. Joseph Absi, MD: Sports Medicine Specialist

  https://www.absiortho.com/blog/why-did-my-acl-tear

  Poor conditioning and participating in sports when youre out of shape can increase your risk of an ACL tear and other injuries. […] Improper or ill-fitting footwear can also make you vulnerable to an ACL tear. The wrong shoes can put extra strain on your joints and ligaments, making you susceptible to falls or trips. […] Most ACL tears happen without contact, typically the result of an abrupt, twisting movement: You stop suddenly and change direction, often while pivoting or landing incorrectly after a jump. The injury can occur during sports or everyday activities. […] An ACL tear can also occur as the result of a sudden impact to your knee, for example, when a player is hit by the hard helmet or foot of another player. […] Sports that involve landing on your heels or planting your feet in sharp, weight-bearing motions can make your knees vulnerable to ACL tears. Sports with higher risks of ACL tears include football, basketball, lacrosse, soccer, skiing, and volleyball.

• #2 ACL Tear: Symptoms and Treatments for a Torn ACL | HSS

  https://www.hss.edu/condition-list_torn-acl.asp

  Tears of the anterior cruciate ligament (ACL) are quite common among athletes and active individuals of all ages. […] The ACL is particularly vulnerable to injury during pivoting or side-to-side athletic activity or as the result of impact. A torn ACL is a common injury in athletes of all levels. It is especially common in sports with a lot of leg planting, cutting and pivoting, such as soccer, basketball, skiing, and football. […] A partial or complete ACL tear (rupture) often occurs during a sudden twisting movement, in which a person stops quickly and changes direction, especially while pivoting or landing after a jump. A sudden, high-energy impact to the knee can also cause the ACL to tear. […] ACL tears that occur in conjunction with multiple other ligament injuries are usually a result of a high-energy injury, such as a car accident.

• #2 ACL Injury Etiology in Its Context: A Systems Thinking, Group Model Building Approach

  https://www.mdpi.com/2077-0383/13/16/4928

  To facilitate the understanding of the etiology of ACL injury and suggest solutions for its prevention, researchers have been able to categorize potential risk factors into two main areas. Internal risk factors involve athletic capacities and external risk factors include all those interactions between the athlete and the environment. These factors can be further divided into those that can be modified through specific interventions, named modifiable factors, and those that cannot change (non-modifiable). Intrinsic and modifiable factors have attracted the attention of clinicians and researchers worldwide, and many exercise injury prevention programs have been established that focus on modifying the neuromuscular and biomechanical risk factors. However, it is still up to investigate the level of influence of these well-studied intrinsic and modifiable factors on the risk of ACL injury.

• #2 The Risks and Causes of ACL Injury and How You Can Prevent Them » ForeverFitScience

  https://foreverfitscience.com/advice/the-risks-and-causes-of-acl-injury-and-how-you-can-prevent-them/

  Females that compete in high impact sports suffer ACL injuries at a rate somewhere between 4 and 6 times greater than their male counterpart (Hewett, 2005). […] This increased angle is the result of females having wider hips than their male counterparts, which can increase the risk of the knee collapsing into valgus, and therefore resulting in an increased risk of ACL rupture (Kzlgz, 2018). […] Those individuals who land with a greater knee abduction angle (AKA, with their knee collapsing in more) are at a much greater risk of ACL injuries than those who do not (Ishida, 2018).

• #2 ACL Tear: Symptoms and Treatments for a Torn ACL | HSS

  https://www.hss.edu/condition-list_torn-acl.asp

  Active, young, females experience a higher incidence of ACL injuries than males of the same age because of a multitude of factors, including landing mechanics, anatomy of the knee joint, inherent looseness of tissues. […] ACL injuries are also common in children, especially as youth sports become increasingly competitive. […] The long-term outcome for patients who are treated nonsurgically varies. Those who return to unrestricted activity are likely to experience some knee instability with side to side or pivoting movements. […] Without surgery, however, there is an increased risk of developing knee osteoarthritis.

• #2 Anterior cruciate ligament injury: towards a gendered environmental approach | British Journal of Sports Medicine

  https://bjsm.bmj.com/content/55/17/984

  To improve movement control in high risk positions, many exercise-based ACL injury prevention programmes have been developed. […] However, girls and women participate in resistance training at a much lower rate than boys and men, and this gap is associated with strong gendered expectations of how a woman’s body is supposed to look and the gender typing of weightlifting as masculine. […] The current paradigm for ACL injury displaces bodies from the conditions of our existence, instead focusing heavily on biomechanical explanations, as if our muscles and joints are not impacted by the weight of our life experiences. […] The addition of gender as an environmental factor in the ACL injury model moves us toward a more dynamic consideration of sex/gender in ACL injury research. […] Our gendered environmental approach offers additional explanations for the sex/gender disparity in ACL injury rates, and opens up new avenues of research. […] The ACL injury cycle requires a holistic and intersectional approach; for example, we cannot simply tell girls/women to get stronger to reduce injury risk if society and the environment do not support those types of activities for everyone.

• #2 Anterior cruciate ligament injury – Wikipedia

  https://en.wikipedia.org/wiki/Anterior_cruciate_ligament_injury

  The relatively wider female hip and widened Q angle may lead to an increased likelihood of ACL tears in women. During puberty, sex hormones also affect the remodeled shape of soft tissues throughout the body. The tissue remodeling results in female ACLs that are smaller and will fail (i.e. tear) at lower loading forces, and differences in ligament and muscular stiffness between men and women. […] Researchers have found that female athletes often land with the knees relatively straight and collapsing inwards towards each other, with most of their bodyweight on a single foot and their upper body tilting to one side; these four factors put excessive strain on the ligaments on the knee and thus increase the likelihood of ACL tear.

• #2 ACL Injury Causes, Symptoms, Treatment | Omaha, Ne

  https://www.omahaknee.com/anterior-cruciate-ligament/

  One of the most common knee injuries is an anterior cruciate ligament sprain or tear. […] Athletes who participate in high demand sports like soccer, football, and basketball are more likely to injure their anterior cruciate ligaments. […] The anterior cruciate ligament can be injured in several ways: Changing direction rapidly Stopping suddenly Slowing down while running Landing from a jump incorrectly Direct contact or collision, such as a football tackle. […] Several studies have shown that female athletes have a higher incidence of ACL injury than male athletes in certain sports. It has been proposed that this is due to differences in physical conditioning, muscular strength, and neuromuscular control. Other suggested causes include differences in pelvis and lower extremity (leg) alignment, increased looseness in ligaments, and the effects of estrogen on ligament properties.

• #2 ACL Injury Etiology in Its Context: A Systems Thinking, Group Model Building Approach

  https://www.mdpi.com/2077-0383/13/16/4928

  A recent meta-analysis found 19 risk factors for ACL injury in female team sports players, suggesting that only three are influential. These factors included previous ACL injury, bipedal increased postural sway during a 30 s stance with eyes open, and increased body mass. However, it appears that factors do not behave as significant when studied in isolation and may prove of significant impact on injury occurrence when they are examined in combination with each other. For example, a coexisting excessive lateral trunk excursion during landing along with knee valgus during a single leg drop vertical jump was a significant predictor of knee injury in female athletes. Furthermore, athletes with a combination of decreased notch width, increased anteroposterior laxity, and increased body mass index presented a relative risk 21.3 times compared with controls, while these variables, when studied in isolation, had a relative risk of 3.8, 2.6, and 2.0, respectively.

• #2 ACL Injuries in Young Athletes: Risk Factors and Prevention | Patient Education | UCSF Benioff Children’s Hospitals

  https://www.ucsfbenioffchildrens.org/education/acl-injuries-in-young-athletes-risk-factors-and-prevention

  Some ACL injuries are simply bad luck for example, two players colliding on the field. However, sports medicine experts have identified several factors that may raise an athlete’s risk of an ACL tear. […] Individual risk factors for an ACL injury include: […] ACL tears are more common in females than males. Several anatomical features of female bodies increase strain on the knee and consequently the ACL. […] Greater joint and ligament laxity: Some of this looseness is genetic, and some may be due to hormones, such as estrogen. Laxity makes the ACL tissue more susceptible to tearing. […] Athletes with poor proprioception or neuromuscular control have higher rates of ACL injury. […] Poor landing mechanics can dramatically raise the risk of an ACL injury, specifically landing with: […] Having excessively strong quadriceps (muscles in the front of the thighs) and weak hamstrings (muscles in the back of the thighs) pulls the shinbone forward from its natural position, increasing the risk of an ACL injury. […] Receiving a blow to the leg isn’t under an athlete’s control. […] Studies have shown that dry weather increases the friction between athletic shoes and the ground. […] Compared with a natural surface, artificial turf creates more friction between shoes and the ground.

• #2 Mastering the Game: Deconstructing Anterior Cruciate Ligament Injuries in Sports – Causes, Treatments, and Prevention Strategies – The Cruciates

  https://thecruciates.com/mastering-the-game-deconstructing-anterior-cruciate-ligament-injuries-in-sports-causes-treatments-and-prevention-strategies/

  Poor strength and conditioning of the muscles surrounding the knee can elevate the risk of ACL injuries. Athletes with muscle imbalances, particularly weak quadriceps or hamstrings, are more prone to ligament strain due to insufficient support and stability. […] Overuse injuries are a common cause of ACL tears. Prioritizing recovery through adequate rest, proper nutrition, and hydration ensures the body is well-prepared for rigorous physical activity. […] Educating athletes on the warning signs of ACL injuries such as knee instability, pain, or swelling encourages early intervention, which can prevent minor injuries from worsening into severe tears.

• #2 Physical therapy in Baltimore for Knee – 5468

  https://www.eagletherapy.org/Injuries-Conditions/Knee/FAQs/Can-you-give-me-a-quick-overview-of-what-causes-ACL-injuries/a~5468/article.html

  Neuromuscular risk factors include posture, landing biomechanics, ground reaction forces, core stability, trunk displacement, and active proprioceptive repositioning error. Changes in movement patterns from any one of these factors increase the strain on the ACL and seem to be contributing to the increased risk of ACL injuries. […] Extrinsic refers to something outside the body such as the type of playing surface or equipment in use. Sometimes weather and field condition contribute to increasing the risk of any injury including ACL tears or ruptures. […] Further research is needed to fully understand all ACL risk factors and find appropriate prevention strategies. The role of skeletal and muscular maturation versus conditioning must be evaluated as well.

• #2 The Risks and Causes of ACL Injury and How You Can Prevent Them » ForeverFitScience

  https://foreverfitscience.com/advice/the-risks-and-causes-of-acl-injury-and-how-you-can-prevent-them/

  Poor core strength and trunk control have previously been identified as a risk factor for ACL injury, as has single leg postural control both of which relate to your capacity to move and control your body during powerful athletic tasks. […] Similarly, lower limb muscular strength imbalances have also been shown to impact ACL injury risk. […] More specifically, the relative weakness of the hamstrings compared to the quadriceps can result in increased forward translation of the tibia on the femur, which as we know, can place the ACL under increased load. […] Similarly, weakness of the muscles that act on the hip (think gluteus medius, gluteus maximus, and the external rotators) can allow the knee to rotate inwards, which again, contributes to the acute incidence of ACL injury. […] In conjunction with the above, asymmetrical lower body strength has also been identified as a potential risk factor for ACL injury.

• #2 Understanding ACL Tears: Comprehensive Guide to Symptoms, Treatments, and Recovery – Plancher Orthopedics

  https://plancherortho.com/understanding-acl-tears-comprehensive-guide-to-symptoms-treatments-and-recovery/

  Intriguingly, around 70% of all cases involving torn ACLs occur without direct contact. Instead, they happen when deceleration is paired with twisting motion. […] The risk is elevated by certain physical factors including narrower notch widths at the knee joint and increased tibial slopes that make individuals more prone to these types of injuries. […] Grasping the factors that lead to ACL injuries and how they are treated is just as vital as taking steps to prevent them. Year-long commitment to training, involving both strength-building and flexibility exercises, plays a key role in enhancing balance and coordination — important aspects for minimizing the likelihood of suffering from ACL injuries.

• #2 Physical therapy in Baltimore for Knee – 5468

  https://www.eagletherapy.org/Injuries-Conditions/Knee/FAQs/Can-you-give-me-a-quick-overview-of-what-causes-ACL-injuries/a~5468/article.html

  As you have found out the hard way, anterior cruciate ligament (ACL) injuries are more common than athletes would like and can be very disabling. They can take a long time to heal and rehab. An injury forceful enough to rupture a ligament like the ACL can also cause damage to other soft tissues in the knee making recovery an even greater challenge. For an overview, it may be helpful to recognize that there are many identified causes of ACL injuries. Most are multifactorial meaning there is more than one factor increasing the risk of ACL injury. Two broad categories for these risk factors are: intrinsic risk factors and extrinsic factors. […] Anything intrinsic refers to the patient or affected individual. Intrinsic risk factors potentially contributing to ACL injuries include sex (male or female), hormones, genetic factors, and anatomy. Females are at greater risk than males for ACL injuries for a combination of reasons including anatomy and hormone shifts. Previous injury(ies) to the leg (especially the knee) is also an important risk factor. Anatomical and neuromuscular features play a big role in ACL injuries. Variables such as knee geometry, alignment, and joint laxity are half the problem. Knee geometry refers to three specific measures of shape, depth, and angle that have been linked with ACL injuries. These include decreased intercondylar femoral notch size, decreased depth of concavity of the medial tibial plateau, and increased slope of the tibial plateaus.

• #2 ACL Injuries Causes, Symptoms, and Treatments

  https://www.upmc.com/services/orthopaedics/conditions/acl-injury

  Female athletes are especially at risk for ACL tears. […] Reinjury is the most common complication of an ACL tear. If you’ve already torn your ACL and you play sports regularly, you’re more likely to injure it again. […] If left untreated, ACL injuries may result in ongoing joint and mobility issues later in life.

• #2 Causes of ACL Injuries — Ski Knee Injury Prevention

  http://www.ski-knee.com/causes

  The tearing of the ACL occurs in situations where the knees collapse inwards into a position called valgus with an extended knee, but can also occur during hyperextension, extreme internal rotation of the tibia or situations of deep knee flexion. […] The knee is the most commonly injured area in skiing, accounting for 33% of total injuries, while 38% of knee injuries involve rupturing the ACL. […] Competitive skiers, high level skiers and ski instructors have 47% likelihood of sustaining a major knee injury during their career. […] This injury can be extremely painful and debilitating, often requiring re-constructive surgery. This is followed by 9- 12 months of extensive rehabilitation. Unfortunately, those who receive reconstructive surgery have 23% chance of the injury re-occurring and are 10-times more likely to develop osteoarthritis in adulthood.

• #2 Common Causes of an ACL Tear | Bowen Hefley Orthopedics

  https://www.drbillhefley.com/common-causes-of-an-acl-tear/

  An ACL tear is a painful injury to the anterior cruciate ligament (ACL) in the knee. […] If you are active and athletic, you may be at risk of an ACL tear – one of the most common knee injuries. […] Repetitive movements, a strong twisting action, or any motion that puts a great amount of stress on the knee can lead to a torn ACL. […] Common causes of an ACL tear include the following activities: […] Start/stop motions (such as in basketball and tennis), as well as frequent changes in direction, can cause an ACL tear. […] Most ACL tears are not due to direct, forceful contact, but a direct blow to the knee, such as a football tackle, may indeed cause a torn ACL. […] An ACL tear can also happen in labor-intensive jobs and activities, especially those that require heavy lifting. […] A car accident can cause knee injuries, including a torn ACL. […] An awkward landing during a fall may twist the knee and cause it to give out. This accident may cause a stretch or tear in the ligaments holding your knee together, possibly causing a torn ACL.

• #2 ACL Tears – Causes, Prevention & Treatment » Virtual Physical Therapists

  https://www.virtualphysicaltherapists.com/blog/acl-tears-causes-prevention-rehabilitation/

  Footwear or equipment that is ill-fitted or compromised can cause altered biomechanics and lead to unusual tweaking of the knee, causing undo stress on the ACL. […] It has been shown that artificial turf does not give as much as natural grass and has been correlated to increased injury and ACL tears.

• #2 Common Causes of ACL Injuries | Texas Orthopaedic Associates

  https://www.txorthopaedic.com/blog/common-causes-of-an-acl-injury/

  Playing sports is a great way to stay in shape and socialize. However, it’s not a good idea to go from zero to 60 when it comes to working out and getting competitive. It’s essential to start slow and build up to working hard when you start playing in a rec league or taking up a sport for fun and fitness. Working out hard when your body is not in shape can increase your risk of all types of injuries, including ACL tears or strains. […] It’s important to wear sneakers or other types of footwear, such as cleats, that fit properly and are comfortable. Wearing worn-out sneakers or improper footwear can result in strain on your joints and ligaments as well as falling or tripping. […] Another common cause of ACL injuries is getting hit in the knee, especially if your knee is overextended. This can result from a tackle, collision, or any kind of trauma on or off the field or court.

• #2 Reddit – The heart of the internet

  https://www.reddit.com/r/nfl/comments/9fsxab/oc_3_potential_underlying_causes_of_the_nfls_acl/

  The maintenance of joint stability by the neuromuscular system is critical for preventing ACL injuries because most non-contact ACL injuries happen during spontaneous cutting and changes in direction in which the knee drops into a valgus (inward) and internally rotated (rotated towards midline) position. […] The more traction a playing surface has, the more likely a player is to suffer an ACL injury. […] Each time Los Angeles Rams defensive end Morgan Fox, who tore his ACL during the first week of OTAs, stuck his foot in the ground to make a cut or change direction on the drought-stricken, high-traction grass fields, that foot had a higher chance of getting caught in the ground and torque-ing the knee. […] When you combine all three factorsan inappropriate training quantity and intensity plus lack of neuromuscular reaction training plus a higher-traction surface, it might explain this trend of non-contact ACL ruptures.

• #2 Four reasons for rising ACL tears and other knee injuries | Northwell Health

  https://www.northwell.edu/orthopaedic-institute/news/insights/four-reasons-for-rising-acl-tears-and-other-knee-injuries

  Skeletal immaturity and decreased knee strength. How and when children play youth sports has changed. Long gone are the days of playing multiple sports to keep you busy. Instead, there is more pressure on these young student athletes to develop specific skills in one given sport, forcing them to play all year round. The fear is that if you don’t constantly develop these skills, you will not be able to obtain a scholarship or play at a higher level. Its created a problem because those participating in just one activity sustain more trauma on the same muscles and joints. Their bodies are just not fully developed and are not strong enough to withstand the impact. […] Injury prevention training is critical given the intensity of sport, especially for those between ages 8-23 playing the same game all year. Athletes need to properly prepare for high-intensity activity well before taking the field.

• #2 Reddit – The heart of the internet

  https://www.reddit.com/r/nfl/comments/9fsxab/oc_3_potential_underlying_causes_of_the_nfls_acl/

  Hey everyone, Im back and on the latest edition I explore three potential underlying causes of one unfortunate reality that comes with the start of summer OTAs and camps, ACL tears. […] ACL tears have become a common reality for NFL players and hopefuls as they get back to OTAs and minicamps, known as phase 3 of the NFL offseason. […] The majority of these ACL tearsnearly 73 percent according to a recent studyare non-contact injuries. Unlike a contact ACL injury where blunt force trauma to the knee or surrounding area stresses the ACL beyond its capacity, a non-contact ACL tear points to to some underlying cause(s). […] If the workload ratio of Los Angeles Chargers Hunter Henry, who tore his ACL on the first day of OTAs, was out of whack as he transitioned from his summer programming to Chargers OTAs, that would increase his risk for increased soft tissue injury, which includes ligament injuries, five times.

• #2 ACL Injury: Does It Require Surgery? – OrthoInfo – AAOS

  https://orthoinfo.aaos.org/en/treatment/acl-injury-does-it-require-surgery/

  The ACL is one of the most commonly injured ligaments of the knee. […] Approximately half of ACL injuries occur along with damage to the meniscus, articular cartilage, or other ligaments. […] About half of ACL injuries occur in combination with damage to the meniscus, articular cartilage (the smooth cartilage that covers the ends of bones), or other ligaments. […] Secondary (related) damage may occur in patients who have repeated episodes of instability due to ACL injury. […] Complete ACL tears have a much less positive outcome without surgery. […] Some patients with partial ACL tears may still have instability symptoms. […] There is increasing evidence that children with ACL tears are at high risk for future damage to the meniscus or cartilage with nonsurgical management. […] It is common to see ACL injuries combined with damage to the menisci, articular cartilage, collateral ligaments, joint capsule, or a combination of the above.

• #2

  https://www.advocatehealth.com/health-services/orthopedic-center/specialties/knee/acl-tear

  Factors such as poor conditioning, improper training techniques and inadequate footwear can also increase the risk of an ACL tear. […] Ignoring a torn ACL can lead to ongoing knee instability, making you more prone to additional injuries, including a meniscus tear. Chronic instability can also hinder your ability to engage in physical activities and increase your risk of developing arthritis. Timely treatment is crucial to prevent these complications and preserve knee function.

• #2 Knee Ligament Injuries: Causes, Symptoms & Treatment | UW MedicineStethascopeHeart

  https://www.uwmedicine.org/conditions-symptoms/bone-joint-muscle/knee-ligament-injuries

  Knee ligament injuries can be caused by trauma, such as a car accident. Or they can be caused by sports injuries. […] The ACL is one of the most common ligaments to be injured. The ACL is often stretched or torn during a sudden twisting motion. This is when the feet stay planted one way, but the knees turn the other way. Slowing down while running or landing from a jump incorrectly can cause ACL injuries. Skiing, basketball, and football are sports that have a higher risk for ACL injuries. […] The MCL is injured more often than the LCL. Stretch and tear injuries to the collateral ligaments are usually caused by a blow to the outer side of the knee. This can happen when playing hockey or football.

• #2 Causes of Knee Ligament Injuries | Stanford Health Care

  https://stanfordhealthcare.org/medical-conditions/bones-joints-and-muscles/knee-ligament-injury/causes.html

  The anterior cruciate ligament (ACL) is the most common ligament to be injured. The ACL is often stretched and/or torn during a sudden twisting motion (when the feet stay planted one way, but the knees turn the other way). Skiing, basketball, and football are sports that have a higher risk of ACL injuries. […] The posterior cruciate ligament (PCL) is also a common ligament to become injured in the knee. However, the PCL injury usually occurs with sudden, direct impact, such as in a car accident or during a football tackle.

• #2 ACL Injury: Does It Require Surgery? – OrthoInfo – AAOS

  https://orthoinfo.aaos.org/en/treatment/acl-injury-does-it-require-surgery/

  In young children or adolescents with ACL tears, early ACL reconstruction creates a possible risk of growth plate injury, leading to bone growth problems. […] Chronic instability due to rupture or stretching of the reconstructed ligament or poor surgical technique is possible. […] Growth plate injury. In young children or adolescents with ACL tears, early ACL reconstruction creates a possible risk of growth plate injury, leading to bone growth problems.

• #2 ACL injury and osteoarthritis: causes, symptoms and treatment

  https://www.penningtonslaw.com/news-publications/latest-news/2020/acl-injury-and-osteoarthritis-causes-symptoms-and-treatment

  ACL injuries can be treated surgically or non-surgically, depending on the patient, but may lead to an increased risk of osteoarthritis in later life. […] Unfortunately, patients who suffer an ACL injury also have a higher risk of developing arthritis, and in particular osteoarthritis, in the knee as they grow older. […] The recent study in Scientific Reports has suggested that production of a specific protein that helps lubricate the knee joint may be a predictor of future arthritis in patients with ACL injury. […] The researchers concluded that increased levels of this protein may therefore be a marker for predicting osteoarthritis earlier, thus allowing patients to seek treatment more promptly and to make the lifestyle changes that could prevent their osteoarthritis from deteriorating.

• #2

  https://www.gleneagles.com.sg/conditions-diseases/acl-tear/symptoms-causes

  An anterior cruciate ligament (ACL) injury is commonly called an ACL tear. […] ACL tears commonly occur during sports and fitness activities that involve: […] Your risk of getting an ACL tear is higher if you: […] Play sports that involve start-stop movements, pivoting or sudden changes in direction, as these movements cause the knee to twist or turn. […] If you have an ACL tear, you have a significantly higher risk of developing knee arthritis. […] This increased risk remains regardless of whether the tear was surgically repaired. […] Experts believe that the inflammatory response of the knee to the injury itself contributes to arthritis.

• #2 Anterior cruciate ligament (ACL) injury: MedlinePlus Medical EncyclopediaLock

  https://medlineplus.gov/ency/article/001074.htm

  Use proper techniques when playing sports or exercising. Some college sports programs teach athletes how to reduce stress placed on the ACL. This involves a series of warm up exercises and jumping drills. There are jumping and landing exercises that have been shown to reduce ACL injuries. […] The use of knee braces during vigorous athletic activity (such as football) is controversial. It has been shown to reduce the number of certain knee ligament injuries, but not specifically ACL injuries.

• #2 ACL Injuries in Football: Causes, Treatment, Prevention | HSS

  https://www.hss.edu/article_acl-injuries-football.asp

  Injuries to the anterior cruciate ligament, or ACL, are the most common major knee injuries in football. Interestingly, the damage usually occurs without contact with another player, but because of a sudden change in direction, says Robert Marx, MD, an attending orthopedic surgeon at HSS with special expertise in knee and shoulder surgery. […] Injuries often occur when a player plants their foot on the ground and attempts to rotate their body in relation to that planted foot, placing their weight on it. These motions create a twisting force across the knee joint that the ACL must absorb. When the ACL cannot cope with this force, it ruptures. […] Many of these injuries that occur without contact can be prevented with exercises in particular those that focus on balance, strength and plyometrics such as planks, Nordic hamstrings and squats.

• #2 ACL Tears & Injuries: Symptoms & Causes | NewYork-Presbyterian

  https://www.nyp.org/orthopedics/columbia-orthopedics/ligament-injuries/acl-injury-tear

  Tearing your ACL can lead to other injuries and arthritis. The best way to prevent an ACL tear is to learn the right exercises and muscle strengthening techniques to reduce the risk of damaging your ACL. Engaging in physical conditioning and muscular strength exercises can minimize your ACL’s injury chance.

• #2 ACL Tears: Symptoms, Causes, & Treatment | Pinnacle Orthopaedics

  https://www.pinnacle-ortho.com/acl-tears-and-treatment-options

  While ACL tears are often unavoidable, certain measures can help reduce the risk of sustaining such injuries: Proper warm-up and stretching: Always warm up before engaging in physical activity, and incorporate dynamic stretching to prepare the muscles and joints for movement. Strength training: Focus on building strength in the muscles surrounding the knee, particularly the quadriceps, hamstrings, and calves, to provide better support and stability to the joint. Technique and form: Learn and practice proper techniques for sports and activities to minimize the risk of awkward movements or sudden changes in direction that could lead to injury. Use protective gear: Wear appropriate protective gear, such as knee braces or padding, especially during high-risk activities or sports with a high incidence of ACL injuries. Cross-training: Incorporate a variety of activities into your fitness routine to avoid overuse injuries and maintain overall strength and flexibility.

• #3 Reddit – The heart of the internet

  https://www.reddit.com/r/nfl/comments/9fsxab/oc_3_potential_underlying_causes_of_the_nfls_acl/

  The maintenance of joint stability by the neuromuscular system is critical for preventing ACL injuries because most non-contact ACL injuries happen during spontaneous cutting and changes in direction in which the knee drops into a valgus (inward) and internally rotated (rotated towards midline) position. […] The more traction a playing surface has, the more likely a player is to suffer an ACL injury. […] Each time Los Angeles Rams defensive end Morgan Fox, who tore his ACL during the first week of OTAs, stuck his foot in the ground to make a cut or change direction on the drought-stricken, high-traction grass fields, that foot had a higher chance of getting caught in the ground and torque-ing the knee. […] When you combine all three factorsan inappropriate training quantity and intensity plus lack of neuromuscular reaction training plus a higher-traction surface, it might explain this trend of non-contact ACL ruptures.

• #3 Physical therapy in Baltimore for Knee – 5468

  https://www.eagletherapy.org/Injuries-Conditions/Knee/FAQs/Can-you-give-me-a-quick-overview-of-what-causes-ACL-injuries/a~5468/article.html

  As you have found out the hard way, anterior cruciate ligament (ACL) injuries are more common than athletes would like and can be very disabling. They can take a long time to heal and rehab. An injury forceful enough to rupture a ligament like the ACL can also cause damage to other soft tissues in the knee making recovery an even greater challenge. For an overview, it may be helpful to recognize that there are many identified causes of ACL injuries. Most are multifactorial meaning there is more than one factor increasing the risk of ACL injury. Two broad categories for these risk factors are: intrinsic risk factors and extrinsic factors. […] Anything intrinsic refers to the patient or affected individual. Intrinsic risk factors potentially contributing to ACL injuries include sex (male or female), hormones, genetic factors, and anatomy. Females are at greater risk than males for ACL injuries for a combination of reasons including anatomy and hormone shifts. Previous injury(ies) to the leg (especially the knee) is also an important risk factor. Anatomical and neuromuscular features play a big role in ACL injuries. Variables such as knee geometry, alignment, and joint laxity are half the problem. Knee geometry refers to three specific measures of shape, depth, and angle that have been linked with ACL injuries. These include decreased intercondylar femoral notch size, decreased depth of concavity of the medial tibial plateau, and increased slope of the tibial plateaus.

• #3 ACL Ruptures: Causes and Impact

  https://www.drandrewdutton.com/blog/acl-ruptures/

  Studies show that a staggering 82.4% of ACL tears are caused by sports-related activities, with non-contact injuries making up 72.5% of these cases (Surg, 2017). […] ACL injuries mostly happen without direct contact, making up about 70-80% of all cases (Orthop, 2016). They usually occur during sudden stops or quick pivots, especially when the foot is firmly planted. […] Most ACL tears happen without direct physical impact, highlighting how delicate this important ligament can be. These injuries often occur during specific movements that strain the knee excessively. For example, sudden stops combined with quick changes in direction, especially during cutting movements. […] Certain sports put athletes at a higher risk of ACL injuries. Activities like basketball, soccer, football, and skiing, which involve sudden directional changes, quick stops, and intense jumping movements, are particularly challenging for the ACL. The risk is even more significant during competitive games when athletes push their bodies to the limit.

• #3 ACL Tears: Symptoms, Causes, & Treatment | Pinnacle Orthopaedics

  https://www.pinnacle-ortho.com/acl-tears-and-treatment-options

  While ACL tears are often unavoidable, certain measures can help reduce the risk of sustaining such injuries: Proper warm-up and stretching: Always warm up before engaging in physical activity, and incorporate dynamic stretching to prepare the muscles and joints for movement. Strength training: Focus on building strength in the muscles surrounding the knee, particularly the quadriceps, hamstrings, and calves, to provide better support and stability to the joint. Technique and form: Learn and practice proper techniques for sports and activities to minimize the risk of awkward movements or sudden changes in direction that could lead to injury. Use protective gear: Wear appropriate protective gear, such as knee braces or padding, especially during high-risk activities or sports with a high incidence of ACL injuries. Cross-training: Incorporate a variety of activities into your fitness routine to avoid overuse injuries and maintain overall strength and flexibility.

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