Materiały źródłowe

• #1 Baker’s Cyst – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK430774/

  A Baker Cyst, also known as a popliteal or parameniscal cyst, is a fluid-filled sac that forms in the posterior aspect of the knee, typically located between the semimembranosus and medial head of the gastrocnemius. […] In adults, Baker’s Cysts tend to form in association with degenerative conditions of the knee. One of the most common associations seen is secondary to degenerative meniscal tears. Inflammatory conditions and arthritides are also known causes of popliteal cyst formation. When the cyst forms in association with a meniscal tear, the meniscus serves as a one-way valve and the extruded synovial fluid localizes and consolidates to form a viscous, gel-like material. […] Baker’s cysts form and can expand as a result of the accumulation and extrusion of synovial fluid that localizes between the semimembranosus and medial head of the gastrocnemius. In some instances, normal anatomic variants entail physiologic capsular openings or defects in the posterior knee joint capsule that is essentially contiguous with the gastrocnemius-semimembranosus bursa.

• #1 BAKER’S CYST

  https://pmc.ncbi.nlm.nih.gov/articles/PMC4799332/

  Baker’s cysts are located in the posteromedial region of the knee between the medial belly of the gastrocnemius muscle and semimembranosus tendon. […] In adults, these cysts are related to intra-articular lesions, which may consist of meniscal lesions or arthrosis. […] The pathogenesis of Baker’s cyst is explained by the presence of a connection between the knee joint and a bursa between the gastrocnemius muscle and the semitendinosus tendon, allowing the flow of fluid. There is a valve effect between the cyst and the joint, due to the action of the semitendinosus and gastrocnemius muscles. During flexion the valve opens and during extension the valve closes due to the tension of these muscles. Moreover, the intra-articular pressure of the knee interferes in the formation and in the filling of the popliteal cysts. The intra-articular pressure during partial knee flexion is negative (-6 mmHg), becoming positive with knee extension (16 mmHg). Hence, these three factors presence of communication between joint and bursa, valve effect and variation of intra-articular pressure in the knee correspond to the pathophysiologic explanation of the formation of Baker’s cysts.

• #1 Infected Baker’s Cyst: A New Classification, Diagnosis and Treatment Recommendations | Journal of Orthopaedic Case Reports

  https://jocr.co.in/wp/2018/11/10/2250-0685-1238-fulltext/

  Bakers cyst has a high prevalence in adult population. Despite being usually asymptomatic, cyst complications may develop, such as an infection, rupture and content dissemination into the calf. […] The Bakers cyst pathophysiology is based on unidirectional flow of intra-articular synovial fluid controlled by a valvular mechanism that is depicted by arthrographies. This valvular mechanism may be explained by the presence of a septum, pedicular bending or obstruction caused by loose bodies inside the cyst. […] Foucher described the synovial fluid flow between the joint and the cyst following a pressure gradient and how the communication is closed during the knee extension. He observed that, during manual compression of the cyst, the synovial fluid moved into the joint as long as the knee was inflexion, making the cyst smaller to palpation. This could not be done with the knee in extension. This is called the Fouchers sign.

• #1 Baker Cyst (Popliteal Cyst) Imaging: Practice Essentials, Radiography, Computed Tomography

  https://emedicine.medscape.com/article/387399-overview

  Jayson and Dixon studied the valvular mechanisms in juxta-articular cysts and postulated that joint effusion and fibrin are pumped from the knee joint into the Baker cyst but because of a valvelike communication (either a Bunsen or ball valve) not in the reverse direction. […] The effusion can be readily reabsorbed through the synovial membrane, leaving behind concentrations of fibrin, which on radiographs may appear as gaslike lucencies. […] Arthritis is the most common condition associated with Baker cysts, with osteoarthritis probably being the most frequent cause among the arthritides. […] The occurrence of Baker cysts relates directly to the presence of knee effusion and the severity of the osteoarthritis. […] The common underlying pathology for these medical conditions is synovial proliferation with effusion.

• #1 Baker’s Cyst – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK430774/

  The formation and maintenance of Baker’s cysts can occur through several mechanisms, including joint-cyst communication, sequestration of synovial fluid in the popliteal fossa due to a valve-like effect between the joint space and cyst (controlled by the gastrocnemius-semimembranosus muscle with flexion and extension at the knee), negative intraarticular knee pressure during partial flexion combined with a positive pressure during extension (as a result directing fluid flow towards the cyst from the suprapatellar bursa during flexion); gastrocnemius-semimembranosus bursa enlargement resulting from small traumas to the bursa with muscle contractions; and herniation of the joint capsule into the popliteal fossa.

• #1 Baker’s Cyst: Meaning, Causes, Symptoms, Prevention, Treatment, Ayurveda Understanding

  https://www.easyayurveda.com/2024/09/21/bakers-cyst-meaning-causes-symptoms-prevention-treatment/

  Bursa Enlargement: The gastrocnemius-semimembranosus bursa can enlarge due to minor traumas from muscle contractions. Repeated small injuries to the bursa can lead to its expansion, contributing to cyst formation. […] Joint Capsule Herniation: In some cases, part of the joint capsule may herniate into the popliteal fossa, forming a cystic structure that fills with synovial fluid. […] These mechanisms, individually or collectively, result in the formation and persistence of Bakers cysts.

• #1 Baker cyst – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/bakers-cyst/symptoms-causes/syc-20369950

  Swelling on the back of one knee may be a Baker cyst. This can form when joint-lubricating fluid fills a cushioning pouch (bursa) at the back of the knee. […] A Baker cyst is usually the result of a problem with the knee joint, such as arthritis or a cartilage tear. Both conditions can cause the knee to produce too much fluid. […] But sometimes underlying conditions can cause the knee to produce too much synovial fluid. When this happens, fluid can build up in the back of the knee, leading to a Baker cyst. […] This can be caused by: Inflammation of the knee joint, which can occur with various types of arthritis; A knee injury, such as a cartilage tear.

• #1 Baker Cyst: Symptoms, Causes & Treatment

  https://my.clevelandclinic.org/health/diseases/15183-bakers-cyst

  Baker cysts develop when something damages your knee joint or the tissues around it and extra fluid drains out of your knee. […] The fluid can only drain in one direction out the back of your joint. That buildup forms the sac that becomes a Baker cyst. […] Anything that damages your knee joint can cause swelling and trigger a Baker cyst. The most common causes are different types of knee arthritis and injuries. […] The most common forms of arthritis that cause Baker cysts include: Osteoarthritis, Rheumatoid arthritis, Gout. […] If you experience a knee injury, the damage can cause swelling in your knee that leads to a Baker cyst. […] Injuries that damage your knee ligaments can cause Baker cysts, including: ACL tears, MCL tears, LCL tears, PCL tears. […] A ruptured Baker cyst happens when the sac around the cyst fills up with fluid too fast or with too much pressure and bursts. […] As your knee heals, the fluid in the cyst is absorbed back into your body.

• #1 Popliteal (Baker’s) cyst – UpToDate

  https://www.uptodate.com/contents/popliteal-bakers-cyst/print

  Popliteal synovial cysts, also known as Baker’s cysts, are common in adults and children. They present as swelling in the popliteal fossa due to enlargement of the gastrocnemius-semimembranosus bursa, which lies between these two muscles on the medial side of the fossa, slightly distal to the center crease in the back of the knee. […] Popliteal cysts in adults are often associated with osteoarthritis, inflammatory joint disease, or joint injury. They usually communicate with the adjacent knee joint space, especially in older patients with knee pathology; communicating cysts contain synovial fluid. […] In children, popliteal cysts are usually a primary process, arising directly from the gastrocnemius-semimembranosus bursa; they do not communicate with the joint space. […] The epidemiology, pathogenesis, clinical features, diagnosis, and management of popliteal cyst will be presented here.

• #1 Sports Injury Bulletin – Diagnose & Treat – Baker’s cysts: an early indication of pathology?

  https://www.sportsinjurybulletin.com/diagnose–treat/bakers-cysts-an-early-indication-of-pathology

  It has been found that 38% of symptomatic knees show evidence of Bakers cysts on MRI imaging. […] The pathogenesis of a Bakers cyst is explained by the presence of a connection between the knee joint and the bursa allowing the flow of fluid via a 1-way valve effect. During flexion the valve opens. During extension, the valve closes due to the tension of these muscles. […] The combination of the connection between bursa and knee joint, the 1-way valve system and the pressure changes explain how Bakers cysts are formed. […] Cysts may range in size from small and clinically not palpable, to large masses causing visible swelling of the patients knee. […] Furthermore, it may compress the tibial or peroneal nerve, and may cause peripheral neuropathy. […] Histologically, the following features have been found in cysts: Cyst walls resemble synovial tissue with evident fibrosis.

• #1

  https://step2.medbullets.com/post/view.aspx?id=110678

  Baker’s cysts are commonly found in association with intra-articular knee disorders, such as osteoarthritis and meniscus tears. Histologically, the cyst walls resemble synovial tissue with fibrosis evident, and there may be chronic nonspecific inflammation present. […] It is thought that this can lead to the formation of a popliteal cyst in the presence of chronic knee effusions as a result of intra-articular pathology.

• #1 Baker Cyst | Cedars-Sinai

  https://www.cedars-sinai.org/health-library/diseases-and-conditions/b/bakers-cyst.html

  A Baker cyst forms when an injury or disease causes extra synovial fluid to leak into the extra space behind the knee. […] The synovial fluid inside the joint space may build up as a result of injury or disease. As the pressure builds up, the fluid may bulge into the back of the knee. This can cause the cyst. […] A Baker cyst is usually the result of some other problem with the knee. It may be caused by osteoarthritis or a tear of the knees cartilage. […] In rare cases, a Baker cyst may cause complications. The cyst may enlarge, which may cause redness and swelling. The cyst may also rupture, causing warmth, redness, and pain in your calf. […] Rupture can also lead to its own complications, such as: Trapping of a tibial nerve. This causes calf pain and numbness behind the leg. It can be treated with arthrocentesis and steroid injections. Blockage of the popliteal artery. This causes pain and lack of blood flow to the leg. It can also be treated with arthrocentesis and steroid injections. Compartment syndrome. This causes intense pain and problems moving the foot or toes. Compartment syndrome is a medical emergency. It needs immediate surgery. It can lead to permanent muscle damage if not treated right away.

• #1 Baker Cysts – Bone, Joint, and Muscle Disorders – Merck Manual Consumer Version

  https://www.merckmanuals.com/home/bone-joint-and-muscle-disorders/muscle-bursa-and-tendon-disorders/baker-cysts

  A Baker cyst results from an accumulation of trapped joint fluid, which bulges from the joint capsule behind the knee as a protruding sac. […] Causes of the joint fluid accumulation include rheumatoid arthritis, osteoarthritis, other inflammatory joint diseases and overuse of the knees. […] A rapid increase in the amount and pressure of fluid within the cyst can cause it to rupture. […] The fluid released from the cyst can cause the surrounding tissues to become inflamed, resulting in symptoms that may mimic those of a blood clot in the calf (deep vein thrombosis [DVT]). […] Moreover, a bulging or ruptured Baker cyst can rarely actually cause thrombophlebitis in the popliteal vein (which is located behind the knee) by pressing on the vein.

• #1 popliteal-bakers-cyst-pathogenesis-and-clinical-findings | Calgary Guide

  https://calgaryguide.ucalgary.ca/popliteal-bakers-cyst-pathogenesis-and-clinical-findings/popliteal-bakers-cyst-pathogenesis-and-clinical-findings-2022/

  Muscle tension around cyst Channel between knee joint and cyst opens Knee joint pressure becomes negative Fluid flow from cyst into knee joint […] Fluid in popliteal cyst Knee joint pressure becomes positive Fluid flow from knee joint into cyst […] Cyst Rupture Abrupt and intense pain Stimulates inflammatory response Fluid pushed from veins into interstitial space […] Swelling and erythema (redness) in distal calf and foot […] Pseudo-Thrombophlebitis worse with extension or physical activity (shares symptoms with deep vein thrombosis but no associated clot)

• #1 What is a Baker’s Cyst? | Princeton Orthopaedic AssociatesVisit our FacebookVisit our InstagramVisit our LinkedInVisit our YouTube channelVisit our FacebookVisit our InstagramVisit our YouTube channelasterisksearchclosedownloadmap-markerchevron-leftinfo-c

  https://www.princetonorthopaedic.com/what-is-a-bakers-cyst/

  Several underlying conditions can lead to the formation of a Baker’s cyst: Osteoarthritis: As the most common cause, this wear-and-tear condition inflames the knee joint, increasing fluid production. Rheumatoid arthritis: Inflammatory arthritis can cause excessive fluid to accumulate in the affected joint. […] Meniscus tear: This injury is a tear in the cartilage of your knee and can trigger inflammation, leading to cyst development. Knee injuries: Trauma or repetitive stress can inflame the knee joint, prompting fluid buildup. Gout or other joint issues: Conditions that cause swelling in the knee may result in forming a Baker’s cyst. […] Treatment for a Baker’s cyst often begins conservatively. In many cases, if the underlying condition causing the cyst is treated, the cyst itself will improve. Here’s what medical treatment might involve: Aspiration: For aspiration of the cyst, your orthopaedic surgeon uses a needle to drain the excess fluid from the cyst, which can provide temporary relief from swelling and discomfort. […] Whether you need imaging, joint aspiration, or surgical intervention, our surgeons have the expertise to guide you through the best treatment options.

• #1 Baker’s cyst causes, symptoms, and treatment options (conservative vs. surgery)

  https://www.sports-injury-physio.com/post/baker-s-cyst-causes-symptoms-and-treatment-options-conservative-vs-surgery

  Research has shown that if you remove the Bakers cyst without doing anything about the injury or condition that caused it (e.g. meniscus tear or arthritis), it usually just ends up coming back. Therefore, surgery should rather be directed at fixing or improving whatever is causing the irritation in the knee, e.g. doing a meniscectomy or trimming frayed cartilage.

• #1 Baker’s Cyst Treatment West Bloomfield, MI | Knee Osteoarthritis Treatment Novi, MI

  https://www.drchristophercooke.com/bakers-cyst-orthopaedic-surgeon-sports-medicine-michigan.html

  Baker’s cyst is caused by underlying conditions such as rheumatoid arthritis, osteoarthritis and gout, an injury to the knee, or inflammation of the knee joint. […] If a cartilage tear is causing the over production of synovial fluid, surgery may be determined to repair the cartilage.

• #1 Treatment of baker cyst, by using open posterior cystectomy and supine arthroscopy on recalcitrant cases (103 knees) | BMC Musculoskeletal Disorders | Full Text

  https://bmcmusculoskeletdisord.biomedcentral.com/articles/10.1186/s12891-016-1291-5

  Associated joint disorders with popliteal cysts were stated approximately between the ranges of 4183 % in all reported cases. […] Combined treatment strategies that eliminate intra-articular pathologies and cyst-associated valve mechanisms are thought to be a good option in treatment of the disease. […] Moreover, clarifying the features of the one-way valve within the joint capsule, which leaks the effusion into the cyst, would improve our understanding of the causative factors of a Baker cyst and provide a justification for targeted treatments, including arthroscopic surgery to correct intra-articular pathologies, excision of the posterior cyst and elimination of the valve mechanism. […] It is now well-established that formation of Baker cysts is associated with intra-articular pathologies of the knee, and in particular with medial meniscus tears or other conditions that cause general effusion of the knee.

• #1 Baker’s cyst in children: conservative management versus surgical excision according to clinical and imaging criteria | Annals of Pediatric Surgery | Full Text

  https://aops.springeropen.com/articles/10.1186/s43159-021-00071-1

  Bakers cyst is a distended gastrocnemius-semimembranosus bursa. The first description of Bakers cysts is referred to Adams in 1840, while Baker studied these cysts in the context of intra-articular pathologies and effusion of the knee joints. […] There is still a debate whether Bakers cysts or popliteal cysts in children communicate or not with the internal joint space. […] Surgical excision is the preferred decision in children presented with persistent painful symptoms. The procedure is carried out under general anesthesia with the patient in prone position, through a transverse incision in the popliteal fold, following the skin lines, dissecting all around the cyst. Once the base of the cyst was identified, excision and closure of the remaining orifice was done by absorbable suture in purse string fashion.

• #1 Baker’s Cyst: Causes, Symptoms, Diagnosis, Treatment

  https://www.verywellhealth.com/bakers-cyst-what-you-need-to-know-2552040

  Baker’s cysts, also called popliteal cysts, are fluid-filled sacs caused by excess knee-joint fluid. […] When excess fluid produced by the lining of the knee joint pushes through the back part of the joint capsule (the fibrous tissue surrounding the joint), forms a cyst and protrudes into the back area of the knee, known as the popliteal fossa. […] Simply put, a Baker’s cyst can develop after the joint capsule becomes damaged or weakened. […] The more severe an injury, such as cartilage tear, is, the greater the volume or size of the Baker’s cyst tends to be. […] A study published in 2020 showed that radiosynoviorthesis (a nonsurgical technique that uses radioactive agents to restore the joint lining) could significantly reduce the volume of Baker’s cysts. […] Even after it is surgically removed, a Baker’s cyst may recur. In most cases, however, treatment of the injury that caused the Baker’s cyst will alleviate symptoms and reduce the likelihood that it will recur.

• #1 Best Medical Devices for Treating Baker’s Cysts

  https://softwavetrt.com/treating-bakers-cysts/

  Bakers cysts, also known as popliteal cysts, are fluid-filled sacs that form at the back of the knee, often resulting from underlying joint issues like osteoarthritis, meniscal tears, or rheumatoid arthritis. […] SoftWave Therapy is one of the best types of shockwave therapy for treating Bakers cysts by addressing inflammation and promoting tissue healing. […] SoftWave Therapy promotes the formation of new blood vessels, enhancing local blood supply. […] Reduces inflammatory cytokines that exacerbate cyst formation and pain. […] Reactivates dormant stem cells to aid tissue regeneration. […] For Bakers cysts, SoftWave Therapy reduces inflammation surrounding the cyst, improves blood circulation, and enhances tissue elasticity. […] Ultrasound-guided aspiration combines imaging precision with fluid drainage, making it an essential tool for managing symptomatic Bakers cysts.

• #1 Best Medical Devices for Treating Baker’s Cysts

  https://softwavetrt.com/treating-bakers-cysts/

  High-frequency ultrasound devices provide precise visualization of the cyst and surrounding structures, reducing the risk of complications. […] Following aspiration, corticosteroids are often injected directly into the cyst to mitigate inflammation and delay recurrence. […] Intermittent Vacuum Therapy (IVT) is a non-invasive modality that uses oscillating negative pressure cycles to enhance lymphatic drainage, improve tissue perfusion, and reduce edema associated with Bakers cysts. […] By alternately creating a vacuum and atmospheric pressure, IVT promotes the movement of fluids and reduces tissue swelling. […] Low-Level Laser Therapy (LLLT), also known as photobiomodulation, offers a non-invasive approach to reducing inflammation and promoting healing in Bakers cysts. […] Laser energy stimulates mitochondrial activity, increasing ATP production to support cellular repair and regeneration. […] LLLT reduces inflammatory mediators, alleviating swelling and pain around the Bakers cyst. […] Enhanced cellular activity accelerates the repair of damaged tissues, improving mobility and reducing discomfort.

• #1 Baker’s cyst » Knee diseases | OZMO

  https://www.orthopaediezentrum-muenchenost.de/en/orthopedics/diseases/bakers-cyst/

  Bakers cyst is not a disease in itself, but a symptom that indicates the presence of other diseases or tissue weaknesses. The increased production of synovial fluid in the knee creates a bulge in the joint capsule, which fills with the natural synovial fluid. […] If this tissue is weakened, it cannot sufficiently resist the internal pressure. The weak spot in the joint tissue is stressed by the pressure created in the joint capsule when too much synovial fluid (synovium) is produced, and expands to form a protrusion that can be felt in the back of the knee as a Bakers cyst. Typically, the Bakers cyst emerges from between the large posterior thigh muscle and the calf muscle. […] However, if the knee joint is overstimulated by inflammation or damaged by injury, the tissues strive to improve protection and secrete more joint fluid than normal. However, because space in the joint capsule is limited, there is increased pressure that the connective tissue-like envelope must withstand. If the fabric is weakened, it will not crack, just like an old rubber, but the fabric will thin. This area yields slightly to the outside and fills with excess synovial fluid, creating the typical bulge of the Bakers cyst.

• #1 What’s a Baker’s Cyst and How’s It Treated? – Total Orthopedics and Sports Medicine

  https://www.totalorthosportsmed.com/bakers-cyst-treatment/

  A Bakers cyst is typically caused by inflammation related to the following conditions: […] Worn cartilage causes the knee to become inflamed. This inflammation causes the capsule to make extra fluid which then collects in the Bakers cyst in the back of the knee. […] This inflammation can cause significant swelling which collects in the back of the knee. […] Meniscal tears can cause inflammation as they flip up and down between the cartilage on the bone. […] The most important way to treat a Bakers cyst is to effectively treat the underlying cause of knee swelling. When a Bakers cyst doesn’t go away on its own, an orthopedic specialist may use a needle and syringe to drain the cyst and/or use a corticosteroid injection to decrease pain, inflammation, and swelling.

• #2 Popliteal (Baker’s) cyst – UpToDate

  https://www.uptodate.com/contents/popliteal-bakers-cyst/print

  Popliteal synovial cysts, also known as Baker’s cysts, are common in adults and children. They present as swelling in the popliteal fossa due to enlargement of the gastrocnemius-semimembranosus bursa, which lies between these two muscles on the medial side of the fossa, slightly distal to the center crease in the back of the knee. […] Popliteal cysts in adults are often associated with osteoarthritis, inflammatory joint disease, or joint injury. They usually communicate with the adjacent knee joint space, especially in older patients with knee pathology; communicating cysts contain synovial fluid. […] In children, popliteal cysts are usually a primary process, arising directly from the gastrocnemius-semimembranosus bursa; they do not communicate with the joint space. […] The epidemiology, pathogenesis, clinical features, diagnosis, and management of popliteal cyst will be presented here.

• #2 Baker Cyst: Symptoms, Causes & Treatment

  https://my.clevelandclinic.org/health/diseases/15183-bakers-cyst

  Baker cysts develop when something damages your knee joint or the tissues around it and extra fluid drains out of your knee. […] The fluid can only drain in one direction out the back of your joint. That buildup forms the sac that becomes a Baker cyst. […] Anything that damages your knee joint can cause swelling and trigger a Baker cyst. The most common causes are different types of knee arthritis and injuries. […] The most common forms of arthritis that cause Baker cysts include: Osteoarthritis, Rheumatoid arthritis, Gout. […] If you experience a knee injury, the damage can cause swelling in your knee that leads to a Baker cyst. […] Injuries that damage your knee ligaments can cause Baker cysts, including: ACL tears, MCL tears, LCL tears, PCL tears. […] A ruptured Baker cyst happens when the sac around the cyst fills up with fluid too fast or with too much pressure and bursts. […] As your knee heals, the fluid in the cyst is absorbed back into your body.

• #2 Baker’s Cyst: Meaning, Causes, Symptoms, Prevention, Treatment, Ayurveda Understanding

  https://www.easyayurveda.com/2024/09/21/bakers-cyst-meaning-causes-symptoms-prevention-treatment/

  Bakers cysts, or popliteal cysts, form due to the accumulation of excess synovial fluid in the popliteal bursa, a fluid-filled sac located at the back of the knee. This condition arises from various underlying causes that lead to inflammation or overproduction of synovial fluid. […] The knee joint comprises bones, tendons, and cartilage, all of which require lubrication provided by synovial fluid to facilitate smooth movement and reduce friction. Synovial fluid circulates through several bursae, which are small fluid-filled sacs within the knee. A valve-like system between the knee joint and the popliteal bursa regulates the flow of synovial fluid. When the knee produces an excessive amount of synovial fluid, it can accumulate in the popliteal bursa, leading to the formation of a Bakers cyst.

• #2 popliteal-bakers-cyst-pathogenesis-and-clinical-findings | Calgary Guide

  https://calgaryguide.ucalgary.ca/popliteal-bakers-cyst-pathogenesis-and-clinical-findings/popliteal-bakers-cyst-pathogenesis-and-clinical-findings-2022/

  Popliteal (Bakers) Cyst: Pathogenesis and clinical findings […] Repeated contraction of muscles surrounding the bursa micro trauma to bursa Inflammatory response Idiopathic (common: kids 4-7 years old) Bursa located between medial head of gastrocnemius and semimembranosus tendon Accumulation of inflammatory fluid into the bursa forming a cyst […] Meniscal Tear Tear creates a channel between joint capsule and bursa posterior to the knee joint […] Rheumatoid Arthritis Auto-immune mediated inflammation of knee joint […] Osteoarthritis Destruction of articular cartilage inflammation within knee joint […] Damage to joint capsule and accumulation of inflammatory fluid Proteolytic enzyme dysregulation Local muscle action influences fluid flow and pressure changes […] Intra-articular Popliteal Cyst Known as Bakers cyst Knee extension Muscle tension around cyst Channel between knee joint and cyst gradually closes with tension at full extension, no fluid flow between the joint and cyst (trapping the fluid in the cyst)

• #2 Infected Baker’s Cyst: A New Classification, Diagnosis and Treatment Recommendations | Journal of Orthopaedic Case Reports

  https://jocr.co.in/wp/2018/11/10/2250-0685-1238-fulltext/

  This phenomenon is attributed to the gastrocnemius and soleus muscles relaxation, producing cyst hardness in full knee extension followed by cyst softening with knee flexion. In knee flexion, the communication between compartments is open, allowing flowing of the synovial fluid, with the subsequent balance of pressures. This may explain why patients refer to feel more pain while the knee is extended and relief during knee flexion. […] Based on this case report and the literature review, we propose a new classification, diagnosis and treatment algorithm for infected Bakers cysts.

• #2 Baker Cyst (Popliteal Cyst) Imaging: Practice Essentials, Radiography, Computed Tomography

  https://emedicine.medscape.com/article/387399-reference

  Jayson and Dixon studied the valvular mechanisms in juxta-articular cysts and postulated that joint effusion and fibrin are pumped from the knee joint into the Baker cyst but because of a valvelike communication (either a Bunsen or ball valve) not in the reverse direction. […] The effusion can be readily reabsorbed through the synovial membrane, leaving behind concentrations of fibrin, which on radiographs may appear as gaslike lucencies. […] Arthritis is the most common condition associated with Baker cysts, with osteoarthritis probably being the most frequent cause among the arthritides. […] The occurrence of Baker cysts relates directly to the presence of knee effusion and the severity of the osteoarthritis. […] The common underlying pathology for these medical conditions is synovial proliferation with effusion.

• #2 Baker’s Cyst: Meaning, Causes, Symptoms, Prevention, Treatment, Ayurveda Understanding

  https://www.easyayurveda.com/2024/09/21/bakers-cyst-meaning-causes-symptoms-prevention-treatment/

  The development and persistence of Bakers cysts, also known as popliteal cysts, involve several intricate mechanisms: Joint-Cyst Communication: There is a direct communication between the knee joint and the cyst. This allows synovial fluid to flow into the cyst from the joint space. […] Valve-Like Effect: The gastrocnemius and semimembranosus muscles create a valve-like mechanism that affects the flow of synovial fluid. During knee movements, particularly flexion and extension, this effect can trap fluid in the popliteal fossa, contributing to cyst formation and maintenance. […] Negative Intraarticular Pressure: When the knee is partially flexed, negative pressure within the joint can draw fluid towards the cyst. […] Positive Pressure During Extension: Conversely, during knee extension, positive pressure within the joint directs fluid into the cyst. This dynamic helps maintain the cyst as fluid continuously flows towards it, particularly from the suprapatellar bursa during flexion.

• #2 Popliteal (Baker) Cyst | 5-Minute Clinical Consult

  https://www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/1688688/all/Popliteal__Baker__Cyst?q=Arthritis

  A fluid-filled synovial sac arising in the popliteal fossa as a distention of (typically) the gastrocnemial-semimembranous bursa; not a true cyst. […] Primary cysts are a distention of the bursa (arise independently without an intra-articular disorder). […] Secondary cysts occur if there is a communication between the bursa and knee joint, allowing articular fluid to fill the cyst. […] Associated with synovial inflammation. […] Extension or herniation of synovial membrane of the knee joint capsule or connection of normal bursa with the joint capsule. […] May result from increased intra-articular pressure. […] Commonly seen with knee effusions. […] Direct trauma to the bursa is likely the primary cause in children because of no communication between the bursa and the joint. […] A valve-like mechanism allowing one-way passage of fluid from the joint to the bursal connection has been described.

• #2 Baker’s Cyst Causes, Symptoms, Treatment, Medications, Prevention

  https://www.medicinenet.com/baker_cyst/article.htm

  A Baker’s cyst is swelling caused by fluid from the knee joint protruding to the back of the knee. […] When an excess of knee joint fluid (synovitis) is compressed by the body weight between the bones of the knee joint, it can become trapped and separate from the joint to form the fluid-filled sac of a Baker’s cyst. […] Baker’s cysts are not uncommon and can be caused by virtually any cause of joint swelling (arthritis). The excess joint fluid (synovial fluid) bulges to the back of the knee to form Baker’s cyst. […] The most common type of arthritis associated with Baker’s cysts is osteoarthritis, also called degenerative arthritis. […] Baker’s cysts can occur in children with juvenile arthritis of the knee. […] Baker’s cysts also can result from cartilage tears (such as a torn meniscus), rheumatoid arthritis, and other knee problems.

• #2

  https://www.nhs.uk/conditions/bakers-cyst/

  A Baker’s cyst, also called a popliteal cyst, is a fluid-filled swelling that develops at the back of the knee. […] It’s caused when the tissue behind the knee joint becomes swollen and inflamed. […] Knee damage caused by a sports injury or a blow to the knee can lead to a Baker’s cyst developing. […] A Baker’s cyst can also sometimes occur if you have a health condition such as osteoarthritis usually caused by age-related „wear and tear” of joints; it particularly affects the knees, hips, hands and big toe. […] A Baker’s cyst can also sometimes occur if you have a health condition such as inflammatory arthritis including rheumatoid arthritis, which is a less common type of arthritis and is caused by the immune system attacking the joints. […] A Baker’s cyst can also sometimes occur if you have a health condition such as gout a type of arthritis that usually affects the big toe and is caused by a build-up of the waste product uric acid in the blood.

• #2 Baker’s cyst – Dworska Hospital

  https://dworskahospital.com/treatments-and-operations/orthopedic-operations/knee-surgery/baker-s-cyst

  Baker’s cyst most often develops in children aged 4-7 years and in adults aged 35-70 years, and its location is in most cases constant. […] Cyst formation may result from damage to the joint capsule or inflammation of one of the synovial bursae. […] The first factor that is decisive in the formation of a popliteal cyst, which is crucial for any patient, is the excess amount of exudate in the knee joint. […] This leads to the limitation of the knee movements and creates the possibility of increased fluid leakage through the places of weakened resistance in the joint capsule, which may result in the formation of a popliteal cyst. […] The second factor influencing the formation and persistence of Baker’s cyst is the existing valve mechanism of the articular capsule, which forces a unidirectional flow of exudate fluid. […] All of the above-mentioned factors contribute to the excessive production of synovial fluid and, consequently, the possibility of cysts.

• #2

  https://step2.medbullets.com/post/view.aspx?id=110678

  Baker’s cysts are commonly found in association with intra-articular knee disorders, such as osteoarthritis and meniscus tears. Histologically, the cyst walls resemble synovial tissue with fibrosis evident, and there may be chronic nonspecific inflammation present. […] It is thought that this can lead to the formation of a popliteal cyst in the presence of chronic knee effusions as a result of intra-articular pathology.

• #2 Baker’s Cyst: Causes, Symptoms, & Treatment

  https://www.webmd.com/arthritis/what-is-bakers-cysts

  While its possible for your Bakers cyst to go away on its own with no treatment, in some cases you can have complications from it. A Bakers cyst that grows large can press on vessels, nerves, and tissues around the knee and cause swelling, pain, and numbness. Rarely, a Bakers cyst can burst or cause a blood clot to form, which needs immediate medical care.

• #2 Baker’s cyst | Better Health Channel

  https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/bakers-cyst

  A Baker’s cyst is a swelling on the back of the knee, caused by a build-up of excess fluid inside the bursa. […] When your knee produces too much synovial fluid, the excess fluid causes the bursa behind the knee to expand and bulge. This is a Baker’s cyst (also known as a popliteal cyst). […] Some of the common causes of a Baker’s cyst include: injury trauma or injury to the knee that can cause a build-up of excess fluid, torn cartilage, arthritis particularly rheumatoid arthritis and osteoarthritis, infection can cause fluid to build up around the knee joint, unknown causes Baker’s cysts can sometimes develop for no apparent reason. […] The symptoms of a Baker’s cyst are mild usually, however sometimes complications can develop, such as: the cyst continues to grow, causing your symptoms to worsen, the cyst extends down into your calf muscles, the cyst bursts, leaking fluid into the calf region, typically causing increased pain and bruising around the ankle.

• #2 Sports Injury Bulletin – Diagnose & Treat – Baker’s cysts: an early indication of pathology?

  https://www.sportsinjurybulletin.com/diagnose–treat/bakers-cysts-an-early-indication-of-pathology

  It has been found that 38% of symptomatic knees show evidence of Bakers cysts on MRI imaging. […] The pathogenesis of a Bakers cyst is explained by the presence of a connection between the knee joint and the bursa allowing the flow of fluid via a 1-way valve effect. During flexion the valve opens. During extension, the valve closes due to the tension of these muscles. […] The combination of the connection between bursa and knee joint, the 1-way valve system and the pressure changes explain how Bakers cysts are formed. […] Cysts may range in size from small and clinically not palpable, to large masses causing visible swelling of the patients knee. […] Furthermore, it may compress the tibial or peroneal nerve, and may cause peripheral neuropathy. […] Histologically, the following features have been found in cysts: Cyst walls resemble synovial tissue with evident fibrosis.

• #2 Baker’s Cyst

  https://www.amssm.org/bakers_cyst-csaus-1061.html?StartPos=20&Part=

  Bakers cysts are common findings and arise between the distal semimembranosus and proximal medial gastrocnemius tendons, representing leakage of fluid from the joint space via a valvular opening of the posterior joint capsule. […] Recurrence is common especially if the patient has significant intraarticular pathology such as arthritis or meniscal injury. […] Bakers cysts may rupture with spread of fluid which can mimic signs and symptoms of DVT. […] If large enough, Bakers cysts may compress surrounding structures including peroneal nerve, popliteal artery and tendons though this is rare.

• #2 Baker’s cyst causes, symptoms, and treatment options (conservative vs. surgery)

  https://www.sports-injury-physio.com/post/baker-s-cyst-causes-symptoms-and-treatment-options-conservative-vs-surgery

  When something in the knee joint is irritated and inflamed, it triggers an increase in synovial fluid production. Some of this extra fluid gets pushed into the bursa at the back of the knee, and as the pressure from the fluid increases, it causes the bursa to swell, forming what is known as a Bakers cyst. […] Common conditions that can cause a significant increase in fluid inside the knee joint that may induce a Bakers cyst include: Meniscus tears, Anterior cruciate ligament tears, Injuries to the cartilage, Osteoarthritis, Inflammatory arthritis, e.g. rheumatoid arthritis. […] To treat a Bakers cyst, you have to understand what is causing the irritation inside your knee and take steps to address that. If you focus the treatment solely on the Bakers cyst (like draining the excess fluid), it will likely just return.

• #2 Treatment of baker cyst, by using open posterior cystectomy and supine arthroscopy on recalcitrant cases (103 knees) | BMC Musculoskeletal Disorders | Full Text

  https://bmcmusculoskeletdisord.biomedcentral.com/articles/10.1186/s12891-016-1291-5

  The classic paper by Wolfgang Rauschning provides a thorough description, with illustration, of the etiopathogenesis of popliteal (Baker) cysts, including the presence of capsular openings (communication link) between the gastrocnemius-semimembranosus bursa and the knee joint. […] This slit-shaped capsular orifice behaves as a valve, which opens during knee flexion due to pulling force of semimembranosus tendon and closes with extension due to compressing forces of overlying tendons. […] We postulate that the low recurrence rates is that we targeted intra-articular pathologies with cyst excision and capsule repair using strong absorbable suturing materials (Vicryl/1). […] We agree with the idea that treating intra-articular pathologies and performing closure of the valve, in addition to cyst excision, is beneficial and provided evidence of successful clinical outcomes of this combined approach in our case series.

• #2 Baker’s Cyst Treatment Minneapolis | Popliteal Cyst Treatment Rochester, St. Paul, MN

  https://www.kelechiokorohamd.com/bakers-cyst-orthopedic-surgeon-knee-specialist-sports-medicine-minneapolis-st-paul-rochester-mn.html

  Bakers cyst is caused by underlying conditions such as rheumatoid arthritis, osteoarthritis, and gout, an injury to the knee or inflammation of the knee joint. […] The knee consists of a fluid called synovial fluid, which reduces the friction between the bones of the knee joint while you move your leg. Sometimes this fluid is produced in excess, resulting in its accumulation in the back of your knee. A Bakers cyst or popliteal cyst is a fluid-filled swelling that develops into a lump behind the knee. […] If a cartilage tear is causing the overproduction of synovial fluid, surgery may be suggested to repair the cartilage.

• #2 Baker’s cyst in children: conservative management versus surgical excision according to clinical and imaging criteria | Annals of Pediatric Surgery | Full Text

  https://aops.springeropen.com/articles/10.1186/s43159-021-00071-1

  The original surgical procedure described by Van Demark and Meyer involved the removal of the cyst and the primary closure of the pedicle connecting the cyst with the joint capsule and had been plagued with a high rate of recurrence. […] In the current study, the recurrent cases after surgical removal occurred in the first cases because of rupture of the cyst and inability to close the connection between the cyst and the knee joint and closure and using vicryl sutures, we tried to decrease the recurrence rate by closure of the residual orifice with purse string stitches using long-lasting absorbable (P.D.S. 5/0) in two layers after meticulous dissection and excision of the cyst.

• #2 Best Medical Devices for Treating Baker’s Cysts

  https://softwavetrt.com/treating-bakers-cysts/

  High-frequency ultrasound devices provide precise visualization of the cyst and surrounding structures, reducing the risk of complications. […] Following aspiration, corticosteroids are often injected directly into the cyst to mitigate inflammation and delay recurrence. […] Intermittent Vacuum Therapy (IVT) is a non-invasive modality that uses oscillating negative pressure cycles to enhance lymphatic drainage, improve tissue perfusion, and reduce edema associated with Bakers cysts. […] By alternately creating a vacuum and atmospheric pressure, IVT promotes the movement of fluids and reduces tissue swelling. […] Low-Level Laser Therapy (LLLT), also known as photobiomodulation, offers a non-invasive approach to reducing inflammation and promoting healing in Bakers cysts. […] Laser energy stimulates mitochondrial activity, increasing ATP production to support cellular repair and regeneration. […] LLLT reduces inflammatory mediators, alleviating swelling and pain around the Bakers cyst. […] Enhanced cellular activity accelerates the repair of damaged tissues, improving mobility and reducing discomfort.

• #2 Baker’s cyst | Hirslanden

  https://www.hirslanden.ch/en/corporate/disease-patterns/baker-cyst.html

  A Baker’s cyst usually indicates an underlying disease or damage to the knee joint and occurs predominantly in middle and old age. […] The injuries or underlying diseases listed lead to the formation of excessive fluid in the knee. This increases the pressure in the knee joint and can lead to the joint capsule protruding into the hollow of the knee. […] Because Baker’s cysts often develop as a reaction to damage to the knee or a joint disease, it is important to treat the underlying cause.

• #2 What is a Baker’s cyst? – MSK Injections

  https://mskinjections.com/what-is-a-bakers-cyst/

  Bakers cysts are strongly associated with intra-articular lesions particularly among the elderly with established OA along with other co-existing pathologies such as meniscal tears (medial predominantly) and Rheumatoid Arthritis (RA) […] A distended bursa is normally referred to as a Bakers or Popliteal cyst. […] The take home message though is to make sure you manage the whole joint and not just the Bakers cyst.

• #3 Popliteal (Baker) Cyst | 5-Minute Clinical Consult

  https://www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/1688688/all/Popliteal__Baker__Cyst?q=Arthritis

  A fluid-filled synovial sac arising in the popliteal fossa as a distention of (typically) the gastrocnemial-semimembranous bursa; not a true cyst. […] Primary cysts are a distention of the bursa (arise independently without an intra-articular disorder). […] Secondary cysts occur if there is a communication between the bursa and knee joint, allowing articular fluid to fill the cyst. […] Associated with synovial inflammation. […] Extension or herniation of synovial membrane of the knee joint capsule or connection of normal bursa with the joint capsule. […] May result from increased intra-articular pressure. […] Commonly seen with knee effusions. […] Direct trauma to the bursa is likely the primary cause in children because of no communication between the bursa and the joint. […] A valve-like mechanism allowing one-way passage of fluid from the joint to the bursal connection has been described.

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