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Baker's cyst

60 citationsUpdated Sep 2026

Overview

Popliteal cysts in adults are almost never an isolated pathology and are usually secondary to intra-articular pathological processes, most commonly meniscal tears [3, 4]. In young and middle-aged adults, posterior medial meniscal disease should be given first consideration when a popliteal cyst is present [5]. Diagnostic accuracy is critical, as a dislocated polyethylene meniscal bearing in mobile bearing unicompartmental knee arthroplasty may generate images similar to a Baker cyst, leading to incorrect diagnosis and inappropriate management [1]. Additionally, a ganglion cyst can be generated by non-absorbable meniscal repair suture material [47]. Simple surgical removal of the cyst is not warranted without a pre-arthrotomy arthrogram to determine the etiology [3].

Nonoperative treatment of popliteal cysts seems to be insufficient in the majority of cases [31]. If a joint lesion is present, arthrotomy is the indicated treatment rather than cyst excision [5]. Arthroscopy is indicated for intra-articular symptoms associated with popliteal cysts [9] and has been recommended for future clinical interventions due to better clinical outcomes with minimal invasion [24]. Arthroscopic treatment of popliteal cysts is a relatively straightforward procedure that confirms the viability and value of the approach with excellent patient satisfaction and low incidence of reoccurrence [28]. Excision may be necessary if a cyst is resistant to conservative treatment or arthroscopy [9].

Surgical excision cannot be considered a definitive solution in the majority of patients with popliteal cysts [4]. However, surgical excision appears to be the treatment of choice for giant synovial cysts of the calf in patients with rheumatoid arthritis, offering immediate relief with no complications or recurrences following operation [41]. If surgery is performed for a ganglion cyst generated by non-absorbable meniscal repair suture material, cysts and suture materials should be removed [47]. Clinicians must be aware of the risk of compartment syndrome in patients with a ruptured Baker's cyst in whom inadvertent anticoagulation has occurred [10]. The use of an irrigation pump assisted arthroscopic synovectomy and a dressing with the knee in extension in the presence of a popliteal cyst is cautioned against due to the risk of inducing a pyogenic, ruptured Baker's cyst [39].

Anatomy & Pathophysiology

Bursae and Cyst Formation

A Baker cyst is a synovial-lined distended bursa located in the popliteal space [46]. These cysts form in the popliteal region of the knee [45] and develop secondarily via extravasation of joint fluid [45]. Symptoms most often arise from the bursa beneath the medial head of the gastrocnemius or the semimembranosus bursa [46]. The semimembranosus bursa is a double bursa situated between the semimembranosus tendon and the medial tibial condyle, and between the semimembranosus tendon and the medial head of the gastrocnemius [46]. Popliteal cysts are considered a distension of the bursa located between the medial head of the gastrocnemius muscle and semimembranosus [27].

Cyst formation occurs through two primary mechanisms: herniation of the synovial membrane through the posterior part of the knee capsule, or escape of fluid through the normal communication of a bursa with the knee, specifically the semimembranosus or medial gastrocnemius bursa [46]. The pathomechanism involves excessive intra-articular synovial fluid production owing to intra-articular pathologies and a valvular mechanism that allows only unidirectional flow [32]. In children, intra-articular pathology is rare [21], the cyst infrequently communicates with the joint, and intra-articular pathologic findings are uncommon [46]. Pediatric popliteal cysts typically are not associated with intra-articular pathology and may not always communicate with the joint [45]. The fluid in pediatric cases may involve the semimembranosus-gastrocnemius or subgastrocnemius bursa [45].

In adults, intra-articular pathologic findings are common, and the cyst can recur if the intra-articular pathologic condition is not corrected [46]. In most cases, popliteal cysts persist if only intra-articular lesions are treated [32]. In cases of osteoarthritis with grade III or IV chondral lesions, it may be impossible to successfully eliminate the effusion and cyst [11]. Giant synovial cysts of the calf often are associated with rheumatoid arthritis and arise from and communicate with the knee in the popliteal area [46]. A dissecting popliteal cyst in the presence of a total knee arthroplasty might be a sign of wear particles generation [87].

Arthroscopic Anatomy and Pathogenesis

Kim et al. described an association between the presence of capsular folds and holes in the capsule between the incidence of popliteal cysts in 194 knees treated arthroscopically [46]. Comprehensive understanding and knowledge of the arthroscopic anatomy of the posteromedial capsule would contribute to the arthroscopic approach in understanding the pathogenesis of popliteal cyst [51]. The opening connection between the joint cavity and the popliteal cyst is located at the posteromedial side of the medial head of the gastrocnemius after inferior displacement of the capsular fold [37]. The capsular fold overlies this opening connection [37].

Arthroscopic internal drainage reestablishes the “two-way valve” mechanism between the bursa and the joint space [29]. This technique, using an anterior-anteromedial approach to expand communication, is effective and safe for treating Baker’s cyst [29]. Arthroscopic internal drainage shows satisfactory clinical results and a lower recurrence rate compared with open excision [29]. It offers small incision, less bleeding, shorter operation time, and no plaster compared with open excision [29]. Arthroscopic treatment for popliteal cysts exhibited better clinical outcomes with minimal invasion [24].

Cyst wall resection may improve therapeutic efficacy [6]. Relative to cyst wall preservation, popliteal cyst wall arthroscopic resection can yield more satisfactory clinical results and decrease rates of recurrence, though it can increase the incidence of complications [16]. High-level clinical research with large numbers of patients and long-term follow-up is required to draw definitive conclusions regarding cyst wall resection [6]. The direct extra-articular arthroscopic excision of popliteal cyst has favorable functional outcomes and low recurrence rate [12]. The cystic portal technique is effective in treating a giant synovial cyst of the knee even in the presence of meniscal tears and high grade chondral lesions [13].

Arthroscopic knee cavity internal drainage through the posteromedial portal and popliteal cyst cavity debridement through the superior posteromedial portal is an effective minimally invasive surgery method for the treatment of popliteal cyst without recurrence in knee osteoarthritis patients [27]. In a study of arthroscopic internal drainage and cystectomy in knee osteoarthritis, all patients had neither recurrence of popliteal cyst nor complaints of pain, swelling, or functional impairment at average 24 months follow-up [27]. Postoperatively, VAS score was decreased significantly and Lysholm score was raised significantly comparing preoperatively in this study [27]. The presented arthroscopic resection method offers accuracy in positioning and has a short learning curve [40]. This approach, combined with addressing intra-articular pathology, aims to decrease the recurrence rate of popliteal cysts [8].

Clinical Presentation and Differential Diagnosis

A dislocated polyethylene meniscal bearing may generate images similar to a Baker cyst [1]. A dislocated polyethylene meniscal bearing may lead to incorrect diagnosis and inappropriate management if mistaken for a Baker cyst [1]. Malignant tumors can clinically simulate popliteal cysts, particularly when located laterally in the popliteal fossa [26]. A nerve sheath ganglion of the tibial nerve can present as a Baker's cyst [20]. Careful physical evaluation combined with proper imaging study is necessary to differentiate Baker's cyst from nerve sheath ganglion of the tibial nerve [20]. When a knee tumor is initially misdiagnosed as an athletic injury, treatment may be adversely affected by the delay in diagnosis or an inappropriate invasive procedure that results in extension of the tumor [23]. A diagnosis of spontaneous osteonecrosis of the medial femoral condyle may avoid unnecessary arthroscopy [30].

A horseshoe-shaped Baker's cyst may represent an enlargement and fusion of two knee bursae rather than a mechanical herniation [36]. A popliteal cyst can dissect down into the calf in an intramuscular path [46]. Intramuscular dissection of a popliteal cyst has been reported involving the medial head of the gastrocnemius [46]. It is hypothesized that intramuscular dissection takes the path of least resistance through a weakness in the medial gastrocnemius fascia [46]. Intramuscular dissection of Baker’s cysts has been reported in three cases [44].

Complications and Associated Pathologies

Development of acute compartment syndrome as a result of a ruptured Baker cyst has been reported [46]. Acute compartment syndrome in ruptured Baker’s cyst has been reported [44]. Spontaneous venous bleeding into popliteal cysts has been reported [46]. Patients on strong anticoagulants may bleed into popliteal cysts, leading to dissection into the calf [46]. Popliteal vein thrombosis can occur concurrently with a dissecting popliteal cyst [46]. Venous thrombosis should be excluded as part of the evaluation of suspected pseudothrombophlebitis caused by a dissecting or ruptured popliteal cyst [46]. A pyogenic, ruptured Baker's cyst can be induced by arthroscopic pressure pump irrigation [39]. The authors caution on the use of an irrigation pump assisted arthroscopic synovectomy and a dressing with the knee in extension in the presence of a popliteal cyst [39].

A popliteal artery pseudoaneurysm after arthroscopic cystectomy of a popliteal cyst has been reported [44]. Symptomatic loose bodies of the knee located in a popliteal cyst have been reported [44]. A popliteal cyst with a large osteochondral mass with communication to the knee joint has been reported [14]. A tumor-like meniscal cyst was diagnosed as a synovial cyst based on clinical, radiographic, and pathologic findings [18]. The lesion in the tumor-like meniscal cyst case was arising from the anterolateral part of the lateral meniscus without any tear being recognized during arthroscopy [18]. Histologic view of the tumor-like meniscal cyst showed dense fibrous connective walls without any thin layer of flattened cells lining the cyst consistent with a ganglion cyst [18]. Soft-tissue masses within the cavity of the knee joint are uncommon and are mostly incidental findings on MRI and arthroscopy [18]. Ganglia and cysts differ in their histology and etiology, but the 2 terms are used interchangeably because their clinical significance is equivalent [18]. Synovial cysts are fibrous or synovial membrane–lined and are filled with synovial fluid [18].

Imaging and Diagnostic Evaluation

Musculoskeletal ultrasound provides a rapid, noninvasive, and cost-effective method for diagnosis of popliteal cysts [22]. MRI is the preferred modality for diagnosing popliteal cysts because it can also show intraarticular pathology [46]. The classic popliteal cyst demonstrates low T1 and high T2 signal with communication of joint fluid with the semimembranosus-gastrocnemius bursa on MRI [45]. Popliteal cysts can become quite large and are not always homogenous on MRI because of debris, loose bodies, or hemorrhage that can accumulate in the cyst [45]. The lining of a popliteal cyst will show enhancement on contrast MRI and can be quite thickened and septated because of inflammation [45]. In cases with atypical MRI features, clear communication with the joint should be verified before the assumption of a popliteal cyst [45].

Management Principles

Surgical excision cannot be considered a definitive solution in the majority of patients [4]. Arthrotomy, not cyst excision, is the indicated treatment if a joint lesion is present in young and middle-aged adults [5]. The primary treatment of the popliteal cysts requires management of the underlying intra-articular pathology [45]. Following appropriate management, popliteal cysts may resolve without excision [45]. For larger cysts that are causing symptoms in the popliteal fossa, excision through a posterior or posteromedial approach may be performed [45]. In patients with rheumatoid arthritis who have a giant synovial cyst removed, a synovectomy should be performed later to prevent recurrence of the cyst [46]. The results of simple excision usually are excellent even if incomplete [46]. In a large series of children, popliteal cysts generally resolve with benign neglect [46]. Pediatric popliteal cysts usually resolve spontaneously without treatment [45]. Aspiration may be attempted occasionally, provided that the diagnosis is certain [46].

Associated Meniscal and Ligamentous Pathology

The study evaluated associations between meniscal tear patterns, tear locations, and Baker’s cysts, as well as concomitant chondral lesions [2]. An ossicle developed over time following an injury sufficient to require ACL reconstruction [17]. Meniscal tears in children are commonly seen and are often amenable to repair due to greater healing potential [34]. The meniscus should be probed carefully to differentiate between ring meniscus and incomplete discoid meniscus [35]. A positive double PCL sign does not always indicate a bucket-handle tear of the medial meniscus, as it can also be demonstrated by a thickened discoid meniscus [50]. Arthroscopy remains the diagnostic gold standard for bucket handle tears of menisci [86]. Cyst formation after meniscal repair appears to be independent of repair technique, though T-bar placement external to the joint may contribute [88]. If a patient can squat and waddle back and forth and from side to side without limited knee flexion, discomfort, or clicking at the joint, one may, with reasonable medical certainty, eliminate the probability that a posterior medial meniscal disorder is present [84]. Anterior cruciate ligament mucoid degeneration needs to be more broadly known and properly diagnosed so that progress can be made in its management [48].

Classification

Adult Etiology: In adults, popliteal cysts are usually secondary to intra-articular pathological processes, most commonly meniscal tears [3].

Pediatric Etiology: In children with popliteal cysts, intra-articular pathology is rare, though it may be underestimated in previous studies [21].

Other Considerations: Several distinct pathologies can mimic a Baker's cyst, requiring careful differentiation. A dislocated polyethylene meniscal bearing in mobile bearing unicompartmental knee arthroplasty may generate images similar to a Baker cyst, leading to incorrect diagnosis [1]. A nerve sheath ganglion of the tibial nerve can present as a Baker's cyst, requiring careful physical evaluation and proper imaging to differentiate the two [20]. A popliteal cyst can present with a large osteochondral mass with communication to the knee joint [14]. Additionally, a diagnosis of spontaneous osteonecrosis of the medial femoral condyle (SONK) may avoid unnecessary arthroscopy in patients presenting with symptoms that could be misclassified as a popliteal cyst [30]. Musculoskeletal ultrasound provides a rapid, noninvasive, and cost-effective method for diagnosing popliteal cysts [22].

Clinical Presentation

In young and middle-aged adults presenting with a popliteal cyst, posterior medial meniscal disease should be given first consideration [5]. While intra-articular pathology is rare in children with popliteal cysts, this finding may have been underestimated in previous studies [21]. One third to one half of patients with popliteal cysts are children [46]. In this pediatric population, the popliteal cyst infrequently communicates with the joint, and intraarticular pathologic findings remain rare [46].

Physical examination and diagnostic maneuvers help differentiate the etiology. Transillumination of the cyst can usually establish the diagnosis of a popliteal cyst [46]. A nerve sheath ganglion of the tibial nerve can present as a Baker's cyst, requiring careful physical evaluation and imaging to differentiate [20]. MRI is the preferred diagnostic modality for popliteal cysts because it can also show intraarticular pathology [46].

Specific pathological variants and complications alter the clinical picture. A popliteal cyst may contain a large osteochondral mass with communication to the knee joint [14]. Giant synovial cysts of the calf are often associated with rheumatoid arthritis and arise from and communicate with the knee in the popliteal area [46]. A ruptured Baker's cyst can cause posterior compartment syndrome, particularly in patients who have undergone inadvertent anticoagulation [10].

Investigations

Plain radiography: Radiographs may demonstrate joint space narrowing, osteophytes, sclerosis, and cysts, though they can underestimate isolated chondral lesions [75]. A dislocated polyethylene meniscal bearing in mobile bearing unicompartmental knee arthroplasty may generate images similar to a Baker cyst, leading to incorrect diagnosis and inappropriate management [1].

MRI: Magnetic resonance imaging is useful for confirming MCL injury, identifying the site of injury, and detecting the presence of meniscal and other injuries to the knee [59]. MRI may be used to assess the margin of resection for a neoplasm, identify vascular malformation, or define the location of nerves or vessels relative to popliteal cysts [71]. Preoperative magnetic resonance images showing the popliteal artery close to the cyst can predict the complication of pseudoaneurysm following arthroscopic cystectomy [83]. MRI can be used to evaluate articular cartilage morphology [75].

Arthrography and Arthroscopy: Simple surgical removal of the popliteal cyst is not warranted without a pre-arthrotomy arthrogram to determine the etiology [3]. In young and middle-aged adults, posterior medial meniscal disease should be given first consideration, and arthrotomy, not cyst excision, is the indicated treatment if a joint lesion is present [5]. Arthroscopy is indicated for intra-articular symptoms, and excision may be necessary if a cyst is resistant to conservative treatment or arthroscopy [9]. Arthroscopy is the ideal method to evaluate articular cartilage in vivo [75]. An examination under anesthesia can be valuable when physical examination is unreliable because of the patient guarding the knee, and diagnostic arthroscopy can also be used to evaluate for coexisting pathology [59].

Other Considerations: A diagnosis of spontaneous osteonecrosis of the medial femoral condyle (SONK) may avoid unnecessary arthroscopy [30]. Cortical desmoid is a benign, self-limiting entity that can exhibit aggressive radiologic features, making exact diagnosis important to avoid unnecessary biopsy and complicated therapeutic strategies [15]. Intra-articular pathology is rare in children with popliteal cysts, though it may be underestimated in previous studies [21].

Treatment

Non-Operative

Nonoperative treatment of popliteal cysts appears insufficient in the majority of cases [31]. However, following appropriate management of underlying pathology, popliteal cysts may resolve without excision [45].

Operative

Indications: The primary treatment of popliteal cysts requires management of the underlying intra-articular pathology [45]. In young and middle-aged adults, posterior medial meniscal disease should be given first consideration if a joint lesion is present [5]. Excision through a posterior or posteromedial approach may be performed for larger cysts that are causing symptoms in the popliteal fossa [45].

Surgical Approach / Technique: Arthroscopic treatment for popliteal cysts exhibits better clinical outcomes with minimal invasion compared to other approaches [24]. This procedure is relatively straightforward, offering excellent patient satisfaction and a low incidence of reoccurrence [28]. The all-inside arthroscopic suture technique combined with arthroscopic treatment of associated meniscal tears and/or chondral defects is a technical option for improving Baker's cyst-related symptoms [7]. Arthroscopic decompression using a posteromedial cystic portal shows good clinical results in terms of postoperative function [25]. The described arthroscopic technique with or without an additional posteromedial cystic portal is effective for treating popliteal cysts with combined intra-articular lesions [19]. Arthroscopic treatment using double posteromedial portals is a safe and effective surgical method [81]. Compared with open excision, arthroscopic internal drainage involves a small incision, less bleeding, shorter operation time, and no plaster [29]. Arthroscopic internal drainage shows satisfactory clinical results and a lower recurrence rate compared to open excision [29]. A direct posterior portal by inside-out technique for intracystic debridement aims to decrease the recurrence rate of popliteal cysts when combined with addressing intra-articular pathology [8]. Direct extra-articular arthroscopic excision of popliteal cyst has favorable functional outcomes and a low recurrence rate [12]. The open posterior technique is a safe, effective, and straightforward method to achieve symptomatic relief for refractory popliteal cysts [49]. This open approach minimizes the risk of neurovascular complications and soft-tissue damage [49].

Cyst Wall Management: Popliteal cyst wall arthroscopic resection can increase the incidence of complications compared to cyst wall preservation [16].

Other Considerations: The use of an irrigation pump assisted arthroscopic synovectomy and a dressing with the knee in extension is cautioned against in the presence of a popliteal cyst [39]. The dislocated polyethylene meniscal bearing may generate images similar to a Baker cyst, leading to incorrect diagnosis and inappropriate management [1].

Complications

Wound complications: Cyst wall resection increases the incidence of perioperative complications compared with arthroscopic internal drainage alone [16]. Additional resection of the cyst wall further increases the incidence of perioperative complications compared with arthroscopic internal drainage of popliteal cysts alone [38].

Other Considerations: In patients with a ruptured Baker's cyst in whom inadvertent anticoagulation has occurred, there is a risk of posterior compartment syndrome [10].

Recovery

Postoperative Course and Complications: The postoperative course following excision of a tumor-like meniscal cyst is typically uneventful, with the wound healing well [18]. In patients with a ruptured Baker's cyst who have undergone inadvertent anticoagulation, the clinician must remain vigilant for the risk of posterior compartment syndrome [10]. Regarding arthroscopic interventions, cyst wall resection can increase the incidence of complications compared to internal drainage alone [16, 38]. Furthermore, cyst wall resection with drainage is associated with greater blood loss compared to internal drainage alone [52].

Recurrence and Long-term Outcomes: Simple surgical removal of the cyst is not warranted without a pre-arthrotomy arthrogram to determine the etiology, as popliteal cysts in adults are usually secondary to intra-articular pathological processes [3]. Consequently, surgical excision cannot be considered a definitive solution in the majority of patients with a popliteal cyst [4]. Arthroscopic treatment of popliteal cysts has a low incidence of reoccurrence [28], and direct extra-articular arthroscopic excision of popliteal cyst also demonstrates a low recurrence rate [12]. Relative to cyst wall preservation, popliteal cyst wall arthroscopic resection can decrease rates of recurrence [16]. Additional resection of the cyst wall can result in a lower recurrence rate of cysts compared with arthroscopic internal drainage alone [38]. Partial arthroscopic resection of a meniscal cyst might induce spontaneous resorption of the extra-articular rest, as evidenced by complete resolution of the cyst and absence of symptoms at 16 months post-operation [33].

Functional Outcomes: Direct extra-articular arthroscopic excision of popliteal cyst has favorable functional outcomes [12]. Arthroscopic treatment of popliteal cysts is associated with excellent patient satisfaction [28]. Cyst wall resection with drainage provides superior cyst resolution compared to internal drainage alone [52]. Surgical excision of giant synovial cysts of the calf in patients with rheumatoid arthritis offers immediate relief with no complications or recurrences following operation [41].

Key Evidence

  • [L4] The dislocated polyethylene meniscal bearing may generate images similar to a Baker cyst, leading to incorrect diagnosis and inappropriate management. [1] (10.1016/j.arth.2011.04.045)
  • [L3] The study evaluated associations between meniscal tear patterns, tear locations, and Baker’s cysts, as well as concomitant chondral lesions. [2] (10.1186/s12891-026-09896-6)
  • [L5] The popliteal cyst is almost never an isolated pathology in an adult knee, and surgical excision cannot be considered a definitive solution in the majority of patients. [4] (10.1007/s00167-005-0028-z)
  • [L1] Cyst wall resection may improve therapeutic efficacy, but high-level clinical research with large numbers of patients and long-term follow-up is required to draw definitive conclusions. [6] (10.1186/s13018-016-0356-3)
  • [L4] The all-inside arthroscopic suture technique combined with arthroscopic treatment of associated meniscal tears and/or chondral defects stands as a technical option that could be effective at improving Baker's cyst-related symptoms by either disappearance or reduction of the cyst. [7] (10.1007/s00167-007-0383-z)
  • [Paper] This approach, combined with addressing intra-articular pathology, aims to decrease the recurrence rate of popliteal cysts. [8] (10.1016/j.eats.2014.12.002)
  • [L5] Arthroscopy is indicated for intra-articular symptoms, and excision may be necessary if a cyst is resistant to conservative treatment or arthroscopy. [9] (10.5435/00124635-199605000-00002)
  • [L5] In patients with a ruptured Baker's cyst in whom inadvertent anticoagulation has occurred, the clinician should be aware of the risk of compartment syndrome. [10] (10.1016/s0020-1383(97)00105-8)
  • [L3] In cases of osteoarthritis with grade III or IV chondral lesions, it may be impossible to successfully eliminate the effusion and cyst. [11] (10.1177/03635465020300010401)
  • [L4] The direct extra-articular arthroscopic excision of popliteal cyst has favorable functional outcomes and low recurrence rate. [12] (10.1016/j.otsr.2018.09.022)
  • [L4] The cystic portal technique is effective in treating a giant synovial cyst of the knee even in the presence of meniscal tears and high grade chondral lesions. [13] (10.1007/s00167-007-0405-x)
  • [L4] The case represents a unique presentation of a popliteal cyst containing a large osteochondral mass with communication to the knee joint. [14] (10.2106/00004623-197961010-00030)
  • [L4] Cortical desmoid is a benign, self-limiting entity that can exhibit aggressive radiologic features; exact diagnosis is important to avoid unnecessary biopsy and complicated therapeutic strategies. [15] (10.1007/s00402-008-0687-6)
  • [L1] Relative to cyst wall preservation, popliteal cyst wall arthroscopic resection can yield more satisfactory clinical results and decrease rates of recurrence, but can also increase the incidence of complications. [16] (10.1007/s00402-021-03812-4)
  • [L5] The ossicle developed over time following an injury sufficient to require ACL reconstruction. [17] (10.1016/s0020-1383(02)00288-7)
  • [L4] [18] (10.1016/j.arthro.2005.08.054)
  • [L4] The described arthroscopic technique with or without an additional posteromedial cystic portal is effective for treating popliteal cysts with combined intra-articular lesions. [19] (10.1016/j.arthro.2010.02.012)
  • [Case_report] Careful physical evaluation combined with proper imaging study is necessary to differentiate Baker's cyst from nerve sheath ganglion of the tibial nerve. [20] (10.1007/s00167-006-0062-5)
  • [L3] Intra-articular pathology is rare in children with popliteal cysts, though it may be underestimated in previous studies. [21] (10.1007/s004020050358)
  • [Case_report] Musculoskeletal ultrasound provides a rapid, noninvasive, and cost-effective method for diagnosis. [22] (10.1186/s12891-018-2263-8)
  • [L4] When a knee tumor is initially misdiagnosed as an athletic injury, treatment may be adversely affected by the delay in diagnosis or an inappropriate invasive procedure that results in extension of the tumor. [23] (10.2106/00004623-200307000-00005)
  • [L2] Arthroscopic treatment for popliteal cysts exhibited better clinical outcomes with minimal invasion and can be recommended for future clinical interventions. [24] (10.1186/s13018-017-0659-z)
  • [L4] Arthroscopic decompression of popliteal cyst showed good clinical results in terms of postoperative function. [25] (10.1016/j.arthro.2009.04.049)
  • [L4] Malignant tumors can clinically simulate popliteal cysts, particularly when located laterally in the popliteal fossa. [26] (10.2106/00004623-198163030-00026)
  • [L4] [27] (10.1186/s13018-017-0670-4)
  • [Paper] Arthroscopic treatment of popliteal cysts is a relatively straightforward procedure that confirms the viability and value of the approach with excellent patient satisfaction and low incidence of reoccurrence. [28] (10.1016/j.eats.2018.07.006)
  • [L3] [29] (10.1186/s12891-022-05658-2)
  • [L3] A diagnosis of SONK may avoid unnecessary arthroscopy. [30] (10.1007/s00167-002-0285-z)
  • [L4] Nonoperative treatment of popliteal cyst seems to be insufficient in majority cases. [31] (10.1016/j.arthro.2009.04.050)
  • [Paper] [32] (10.1016/j.eats.2018.11.015)
  • [Case_report] Partial arthroscopic resection of a meniscal cyst might induce spontaneous resorption of the extra-articular rest, as evidenced by complete resolution of the cyst and absence of symptoms at 16 months post-operation. [33] (10.1007/s00167-008-0553-7)
  • [L4] Meniscal tears in children are commonly seen and are often amenable to repair due to greater healing potential. [34] (10.5435/00124635-200911000-00004)
  • [Case_report] The meniscus should be probed carefully to differentiate between these conditions. [35] (10.1007/s00167-009-0924-8)
  • [L4] [37] (10.1016/j.arthro.2006.07.050)
  • [L3] Additional resection of cyst wall can result in a lower recurrence rate of cysts but extend the operation time and increase the incidence of perioperative complications compared with arthroscopic internal drainage of popliteal cysts alone. [38] (10.1186/s12891-020-03453-5)
  • [L4] The authors caution on the use of an irrigation pump assisted arthroscopic synovectomy and a dressing with the knee in extension in the presence of a popliteal cyst. [39] (10.1007/s00167-008-0679-7)
  • [L4] The presented method offers accuracy in positioning and has a short learning curve. [40] (10.1016/j.eats.2022.06.024)
  • [L4] Surgical excision appears to be the treatment of choice, offering immediate relief with no complications or recurrences following operation. [41] (10.2106/00004623-196850040-00006)
  • [L5] They recommend removing cysts and suture materials if surgery is performed. [47] (10.1016/j.otsr.2011.12.006)
  • [L4] Anterior cruciate ligament mucoid degeneration needs to be more broadly known and properly diagnosed so that progress can be made in its management. [48] (10.1007/s00167-011-1433-0)
  • [Paper] The open posterior technique is a safe, effective, and straightforward method to achieve symptomatic relief for refractory popliteal cysts while minimizing the risk of neurovascular complications and soft-tissue damage. [49] (10.1016/j.eats.2013.04.001)
  • [L4] A positive double PCL sign does not always indicate a bucket-handle tear of the medial meniscus, as it can also be demonstrated by a thickened discoid meniscus. [50] (10.1007/s00167-014-3468-5)
  • [L2] Comprehensive understanding and knowledge of the arthroscopic anatomy of posteromedial capsule would contribute to the arthroscopic approach in understanding the pathogenesis of popliteal cyst. [51] (10.1007/s00402-014-2001-0)
  • [L1] Although requiring slightly longer operative time and greater blood loss, cyst wall resection with drainage provides superior cyst resolution, making it preferable for patients seeking optimal results or those with cyst inflammation, loose bodies, or multi-compartment cysts. [52] (10.1186/s13018-025-05978-8)
  • [L3] Arthroscopic treatment of popliteal cysts using double posteromedial portals was a safe and effective surgical method. [81] (10.1186/s13018-023-04132-6)
  • [L5] The advantages include a good visualization of the entire cyst wall and posteromedial capsular fold, ease in performing cystectomy with minimized complications, and no need to add a transcystic portal. [82] (10.1016/j.eats.2024.103138)
  • [L4] Preoperative magnetic resonance images showing the popliteal artery close to the cyst can predict the complication of pseudoaneurysm. [83] (10.1016/j.arthro.2009.05.005)
  • [L4] If a patient can squat and waddle back and forth and from side to side without limited knee flexion, discomfort, or clicking at the joint, one may, with reasonable medical certainty, eliminate the probability that a posterior medial meniscal disorder is present. [84] (10.2106/00004623-196547060-00020)
  • [L4] Arthroscopy remains the diagnostic gold standard for bucket handle tears of menisci. [86] (10.1007/s00167-005-0678-x)
  • [L4] A dissecting popliteal cyst in the presence of a TKA might be a sign of wear particles generation and should be excised to eliminate polyethylene debris that induces prosthetic loosening. [87] (10.1007/s00167-006-0155-1)
  • [L4] Cyst formation after meniscal repair appears to be independent of repair technique, though T-bar placement external to the joint may contribute. [88] (10.1177/03635465990270052001)

See Also

References

[1] Posterior Dislocation of Meniscal Bearing Insert in Mobile Bearing Unicompartmental Knee Arthroplasty Mimicking a Baker Cyst. The Journal of Arthroplasty. 2012. DOI: 10.1016/j.arth.2011.04.045

[2] Linking meniscal pathology to Baker’s cyst formation: the role of tear type, location and chondral damage. BMC Musculoskeletal Disorders. 2026. DOI: 10.1186/s12891-026-09896-6

[3] Popliteal Cysts: AN ARTHROGRAPHIC STUDY AND REVIEW OF THE LITERATURE.. The Journal of Bone and Joint Surgery. American Volume. 1972.

[4] The popliteal cyst. Knee Surgery, Sports Traumatology, Arthroscopy. 2005. DOI: 10.1007/s00167-005-0028-z

[5] Popliteal Cysts Associated with Undiagnosed Posterior Lesions of the Medial Meniscus: THE SIGNIFICANCE OF AGE IN DIAGNOSIS AND TREATMENT.. The Journal of Bone and Joint Surgery. American Volume. 1970.

[6] Surgical treatment of popliteal cyst: a systematic review and meta-analysis. Journal of Orthopaedic Surgery and Research. 2016. DOI: 10.1186/s13018-016-0356-3

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