Pes Anserinus Bursitis: Difference between revisions

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<div class="noeditbox">Welcome to [[Vrije Universiteit Brussel Evidence-based Practice Project|Vrije Universiteit Brussel's Evidence-based Practice project]]. This space was created by and for the students in the Rehabilitation Sciences and Physiotherapy program of the Vrije Universiteit Brussel, Brussels, Belgium. Please do not edit unless you are involved in this project, but please come back in the near future to check out new information!!</div> <div class="editorbox">
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== Search Strategy ==
== Definition/Description ==


Databases Searched: Pubmed, Web of Knowledge, PEDro<br>Keywords: pes anserine bursitis, knee bursitis, medial knee pain, physical therapy, treatment, bursitis.<br>
Pes Anserine [http://www.physio-pedia.com/index.php5?title=Bursitis bursitis] as an inflammatory condition of the conjoined insertion of the sartorius, gracilis and semitendinosus. We can locate this at the proximal medial aspect of the knee<ref name="Moschowitz">Moschowitz E. Bursitis of the sartorius bursa: an undescribed malady simulating chronic arthritis. JAMA 1937; 109:1362</ref>.<br>  
 
== Definition/Description<br>  ==
 
Pes anserinus bursitis (www.physio-pedia.com/Bursitis), also known as intertendinous bursa, is an inflammation of the bursa of the conjoined insertion of the M. Sartorius, M. Gracilis and M. Semitendinosus muscles along the proximal medial aspect of the tibia [4]. The bursa is located approximately two inches below the medial knee joint line between the pes anserinus tendons. The bursa doesn’t communicate with the knee joint [3,5].<br>


== Clinically Relevant Anatomy  ==
== Clinically Relevant Anatomy  ==


add text here
The Pes Anserine bursa is a fluid filled vesicle with the purpose to secrete synovial fluid and hereby reduce friction between two tissues and also works as a cushion for bones, tendons and muscles<ref name="Tschirch">Tschirch FTC, Schmid MR, Pfirrmann CWA, et al. Prevalence and size of meniscal cysts, ganglionic cysts, synovial cysts of the popliteal space, fluid filled bursae, and other fluid filled collections in asymptomatic knees on MR imaging. AJR Am J Roentgenol 2003; 180:1431–1436.</ref>. The inflammation of the bursa does not appear suddenly but over an amount of time. You can have bursitis in your shoulder, knee, hip, elbow and your big toe. <br>


== Epidemiology /Etiology  ==
The Pes Anserine, also called the ‘Goose Foot’ is the insertion of the Musculus Sartorius, Musculus Gracilis and Musculus Semitendinosus who are conjoined proximal on the medial side of the tibia. The three tendons who are important to the Pes Anserine are located superficial to the Medial Collateral Ligament of the knee<ref name="Wood">Wood LR, Peat G, Thomas E, et al. The contribution of selected non-articular conditions to knee pain severity and associated disability in older adults. Osteoarthritis Cartilage. Jun 2008;16(6):647-53.</ref>. The Sartorius and Gracilis are adductors of the leg (they pull the leg towards the median axis of the body.) and the Semitendinosus is part of the Hamstrings who are located at the back of your upper leg. These three muscles are primarily flexors of the knee and internal rotators<ref name="Miller">Miller RH III. Knee injuries. In: Canale ST, ed. Campbell's operative orthopaedics. St Louis: Mosby; 1998: 1113-1299.</ref>.<br>


The exact incidence is unknown. Bursitis is believed to result from overuse and friction to the bursa due to excessive valgus, flatfoot position, rotatory stresses to the knee or by direct contusion[4,7].<br>Reports suggest that anserine bursitis is more common in overweight middle-aged females. We can explain this by the fact that women have a wider pelvis, resulting in angulation of the knee in the frontal plane, which leads to more pressure in the area of insertion of the pes anserinus by genu valgum [2]. <br>Diabetes mellitus also seems to be a predisposing factor[1,2].<br>Anyone with osteoarthritis of the knee is also at increased risk for this condition. The etiology of the pain most likely results from a complex interaction between structural changes secondary to osteoarthritis and peripheral en central pain processing mechanisms[2].<br>The etiologies of pes anserinus bursitis also include trauma such as a direct blow to this part of the knee. A contusion to this area results in an increased release of synovial fluid in the lining of the bursa. The bursa then becomes inflamed and tendered or painful[3].<br>Overuse of the hamstrings, especially in athletes with tight hamstrings is a common cause. Improper training, sudden increases in distance run, and running up hills can contribute to this condition[7]. <br>We can say that an inflamed bursa is not a primary pathology. It’s a consequence of an earlier complication.<br><br>
== Epidemiology /Etiology<br> ==


== Characteristics/Clinical Presentation  ==
Pes Anserine bursitis often occurs when the related muscles are repeatedly used, by doing movements like flexion and adduction. This causes friction and also increases pressure on the bursa. The bursitis can also be due to a trauma like a direct hit in the Pes Anserine region. Some sports like basketball, dancing and most of all running use movements more often then others and are therefore more likely to cause bursitis then others (These movements are flexion and endorotation because the three muscles who are important to the Pes Anserine are primary flexors but also internal rotators. But also adduction and exorotation.). Other important factors are Pes Planus (flat feet), obesity, age, people with valgus deformities (Because the sartorius, gracilis and semimembranosus protect the knee against valgus stress, so when a person has valgus deformities it means that the 3 muscles are not protecting the knee and that could lead to the Pes Anserine syndrome.), incorrect training techniques (Such as neglecting to stretch, doing excessive hill training and sudden increases of mileage.), diabetes&nbsp;<ref name="Cohen">Cohen SE, Mahul O, Meir R, et al. Anserine bursitis and non-insulin dependent diabetes mellitus. J Rheumatol. Nov 1997;24(11):2162-5.</ref> and underlying osteoarthritis of the knee<ref name="Stuttle">Stuttle FL. The no-name and no-fame bursa. Clin Orthop 1959; 15:197-199.</ref>.


It is characterized by spontaneous anteromedial knee pain on climbing or descending stairs, tenderness at the PA and, occasional local swelling [3,4,7].
== Characteristics/Clinical Presentation<br>  ==


Other clinical presentations are:<br>• Decreased muscle strength <br>• Gait deviations <br>• Decreased function <br>• Decreased ROM <br>• Postural dysfunction/impaired lower extremity biomechanics <br><br>
The Pes Anserine Bursitis causes pain on the inside of the knee (mostly during running or taking stairs). Also the region around the bursa will be swollen or tender to touch<ref name="Forbes">Forbes JR, Helms CA, Janzen DL. Acute pes anserine bursitis: MR imaging. Radiology 1995; 194:525-527.</ref>. It gets most irritated due to activities that require movements like flexion, endorotation but also exorotation and adduction. Pivoting, kicking, squatting or quick movements from side to side. Like in sports mentioned above.


== Differential Diagnosis  ==
== Differential Diagnosis  ==


• Medial meniscus lesion (http://www.physio-pedia.com/Meniscal_Lesions) and osteoarthritis: Pain and sensitivity in the medial compartment while in the pes anserinus bursitis they are located inferomedial to the medial joint interline[1,2].<br>• Knee pain secondary to L3-L4 radiculopathy is associated with lumbar pain without pain on digital pressure of the anserine region[2].<br>• Stress maneuvers of the medial collateral ligament, with or without instability, contribute for the diagnosis of lesions of the medial collateral ligament[1,2].<br>• Stress fractures of the proximal medial tibia may produce pain in the area of the pes anserine bursa[2].<br>Panniculitis of the underlying medial knee fat[1]. <br>• Extra-articular cystic lesions: synovial cyst, ganglionic cyst, parameniscal cyst, pigmented villonodular synovitis, synovial sarcoma[3].<br>• In addition to the conditions listed above, other problems to be considered include the following: atypical medial meniscal cysts, juxta-articular bone cysts, semimembranosus bursitis, tibial collateral ligament bursitis[4].<br>
Pes Anserine bursitis is often confused with other medial knee pain. To start with a stress-fracture of the shinbone on the proximedial side will cause pain in the area of the Pes Anserine. Another example is the patellofemoral syndrome or arthritis<ref name="Safran">Safran MR, Fu FH. Uncommon causes of knee pain in the athlete. Orthop Clin North Am 1995; 26:547-549.</ref><ref name="Matsumoto">Matsumoto K, Sinusuke H, Ogata M. Juxta-articular bone cysts at the insertion of the pes anserinus. J Bone Joint Surg 1990; 72A:286-290.</ref><ref name="Hennigan">Hennigan SP, Schenck CD, Mesgarzadeh M et al. The semimembranosus- tibial collateral ligament bursa. Anatomical study and magnetic resonance imaging. J Bone Joint Surg 1994; 76A:1322-1327.</ref><ref name="Kerlan">Kerlan RK, Glousman RE. Tibial collateral ligament bursitis. Am J Sports Med 1988; 16:344-346.</ref>. Panniculitis<ref name="Glencross">Glencross PM. Medscape: Pes Anserine Bursitis. www.emedicine.medscape.com/article/308694-diagnosis (accessed 26 December 2013).</ref> is something that happens to people who are obese and will cause just like bursitis more pain at night. Semimembranosus tendinitis will often appear after running of cutting activities just like Pes Anserine bursitis. But also the medial plica syndrome which can cause pain and tenderness on the medial side of the knee are often confused with Pes Anserine bursitis.  


== Diagnostic Procedures  ==
== Diagnostic Procedures  ==


add text here related to medical diagnostic procedures
Lateral views of the knee of the patient are very useful to say whether or not out patient has to deal with a stressfracture, arthritis or even Osteochondritis Dissecans. But to be sure that we are not dealing with these injuries we have to take an X-ray. To clarify damage caused to other regions of the medial side of the knee, an MRI is needed. This MRI could prevent you from an unnecessary arthroscopy. Of course you have to correlate the MRI with a physical examination<ref name="Zeiss">Zeiss J, Coombs R, Booth R, Saddemi S. Chronic bursitis presenting as a mass in the pes anserine bursa: MR diagnosis. J Comput Assist Tomogr 1993; 17:137-140.</ref><ref name="Hall">Hall FM, Joffe N. CT imaging of the anserine bursa. AJR Am J Roentgenol 1988; 150:1107-1108.</ref>. Another procedure is a Lidocaine/Corticosteriod injection in the area of the bursa which will help us determine the contribution of this pathology with the pathology of his overall knee.


== Outcome Measures  ==
== Outcome Measures  ==


Sinography* is the best method for establishing the diagnosis when other imaging modalities, including MRI and CT, are not feasible[3].
See [[Outcome Measures|Outcome Measures Database]]  
 
* radiography of a sinus following the injection of a radiopaque medium<br>


== Examination  ==
== Examination  ==


History is typical and is characterized by pain in the proximal medial region of the knee, approximately 5 cm below the medial joint interline of the knee[2]. <br>The pes anserine bursa can be palpated at a point slightly distal to the tibial tubercle and about 3-4 cm medial to it (about 2 fingerbreadths)[7]. <br>The examiner will also assess hamstring tightness. This is done in the supine position (lying on your back), head back and arms across the chest. The hip is passively flexed until the thigh is vertical (use the spirit level if available). Maintain this thigh position throughout the test, with the opposite leg in a fully extended position. The foot of the leg being tested is kept relaxed, while the leg is actively straightened until the point when the thigh begins to move from the vertical position. The thigh angle at this point is recorded.<br>Measure the minimum angle of knee flexion with the thigh in the vertical position. If the leg is able to be fully straightened, the angle would be recorded as 0.<br>With the sports-related variant of pes anserine bursitis, symptoms may be reproduced by means of resisted internal rotation and resisted flexion of the knee. With the chronic variant in older adults, flexion or extension of the knee usually does not elicit pain[7]. <br>Tests to examine if there is a sign of pes anserinus bursitis.<br>• Thomas test (http://www.physio-pedia.com/Thomas_Test)<br>• Hamstring flexibility<br>• Leg length measurement<br>• McMurray’s<br>• Ligamentous stability tests<br>• Faber and Scour tests <br><br>
First of all it’s important to examine the tightness of the hamstring. The patient is in the supine position. Then we bend the hip 90° and the knee is straightened as far as possible. How far the knee can be extended will indicate if the Hamstrings are tight or not and how tight they are (If you can straighten your knee completely than your Hamstrings are not tight.).  


== Medical Management <br>  ==
== Medical Management <br>  ==


The initial treatment of pes anserinus bursitis should include relative rest of the affected knee and non-steroidal anti-inflammatory drugs[4]. Additional modalities, including local injection of a corticoid such as methylprednisolone, are indicated is some cases. Intrabursal injection of local anesthetics, corticosteroids, or both constitutes a second line of treatment[4]. <br>Surgical treatment is indicated in cases with failure to conservative treatments. Simple incision and drainage of the distended bursa can improve symptoms in some reported cases[3,4]. The bursa may be removed if chronic infection cannot be cleared up with antibiotics. After Surgery, if the bursa is removed, you follow the same steps of rehabilitation and recovery outlined under physical therapy management[2].<br><br>
When someone has Pes Anserine bursitis, surgical intervention is something that doesn’t occur. Only when your patient has to deal with a local infection and the standard antibiotic treatment doesn’t work a surgical decompression of the bursa could be a solution.<br>  


== Physical Therapy Management <br>  ==
== Physical Therapy Management <br>  ==


- Relative rest: avoid stairs, climbing, or other irritating activities to quiet down the bursa and the related pain[4].<br>- Ice application in the early inflammatory phase[4].<br>- Wrapping an elastic bandage around the knee to reduce any swelling or to prevent swelling from occurring[4]. Be careful not to increase friction.<br>- Leg stretching exercises: hamstring stretch, standing calf stretch, standing quadriceps stretch, hip adductor stretch, heel slide, quadriceps isometrics, hamstrings isometrics[4].<br>- Afterwards: the CKC may include single-knee dips, squats and leg presses. Resisted leg-pulls using elastic tubing are also included.<br>- Ultrasound has been documented as effective in the reduction of the inflammatory process in pes anserine bursitis [2]. <br><br>
Physiotherapy is the mainstay in the treatment of the Pes Anserine syndrome. To temper the pain that the bursa is causing, the most important thing of all is rest. Take nonsteroidal anti-inflammatory drugs (NSAID) to alleviate the pain, restrict movement, alternate ice (An ice massage of 15 minutes every 4-7 hours will reduce the inflammation.) followed by heat and at last some muscle-conditioning exercises<ref name="O'Donoghue">O'Donoghue DH. Injuries of the knee. In: O'Donoghue DH, ed. Treatment of injuries to athletes, 4th edn. Philadelphia: Saunders; 1987: 470-471.</ref><ref name="Larsson">Larsson LG, Baum J. The syndrome of anserine bursitis: an overlooked diagnosis. Arthritis Rheum 1985; 28:1062-1065.</ref><ref name="Brookler">Brookler MI, Morgan EF. Anserina bursitis. A treatable cause of knee pain in patients with degenerative arthritis. Calif Med 1973; 119:8-10.</ref>.<br>  
 
Sometimes people get an injection which consists of a solution of anaesthetic and steroid. Afterwards a physiotherapist will give a hamstring stretching program and a concurrent closed-chain quadriceps strengthening program that has to repeated several times a day. This will result in less pain at about 6-8 weeks.<br>  


== Key Research  ==
== Key Research  ==


Milton Helfenstein et al., 2010, Anserine syndrome, Escola Paulista de Medicina<br>
add links and reviews of high quality evidence here (case studies should be added on new pages using the [[Template:Case Study|case study template]])<br>  


== Resources <br>  ==
== Resources <br>  ==
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== Clinical Bottom Line  ==
== Clinical Bottom Line  ==


Pes anserine bursitis is commonly associated with osteoarthritis or/and overweight females. A typical characteristic is spontaneous anteromedial knee pain on climbing or descending stairs. The differential diagnosis is very encompassing. It doesn’t disappear without treatment such as rest, ice application, stretching and ultrasound. Another often used treatment is intrabursal injection of corticosteroids.<br>
add text here <br>  


== Recent Related Research (from [http://www.ncbi.nlm.nih.gov/pubmed/ Pubmed])  ==
== Recent Related Research (from [http://www.ncbi.nlm.nih.gov/pubmed/ Pubmed])  ==
 
<div class="researchbox"><rss>http://www.ncbi.nlm.nih.gov/entrez/eutils/erss.cgi?rss_guid=1xA-2MTbcyzbSlbtuaqSEJzApadVtyf3nSSQS-bJ7zDtSzS9nL|charset=UTF­8|short|max=10</rss></div>  
see tutorial on [[Adding PubMed Feed|Adding PubMed Feed]]
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== References  ==
== References  ==


[1] J. Uson et al., 2000, Pes anserinus tendino-bursitis: What are we talking about?,Scan J Rheumatol (level of evidence = 3A) <br>[2]Milton Helfenstein et al., 2010, Anserine syndrome, Escola Paulista de Medicina <br>(level of evidence = 2A)<br>[3]Ting-Wen Huang et al., 2003, Polyethylene-Induced Pes Anserinus Bursitis Mimicking an Infected Total Knee Arthroplasty <br>(level of evidence = 3B)<br>[4] W.J. Rennie et al., 2005, Pes anserine bursitis: incidence in symptomatic knees and clinical presentation. <br>(level of evidence = 2A)<br>[5] Mohamed K. Osman et al., 2011, Swelling Around a Child’s Knee <br>(level of evidence = 3B)<br>[6] Tammy White et al., 2009, Central States Orthopedic Specialists <br>[7] http://emedicine.medscape.com/article/308694-clinical<br>
&nbsp; <references /><br>
 
Check following document for pictures and overview<br>  
 
{{pdf|Pes_anserinus_bursitis.pdf‎|Pes Anserinus Bursitis}}&nbsp;
 
[[Category:Vrije_Universiteit_Brussel_Project|Template:VUB]]

Revision as of 22:42, 26 December 2013

Definition/Description[edit | edit source]

Pes Anserine bursitis as an inflammatory condition of the conjoined insertion of the sartorius, gracilis and semitendinosus. We can locate this at the proximal medial aspect of the knee[1].

Clinically Relevant Anatomy[edit | edit source]

The Pes Anserine bursa is a fluid filled vesicle with the purpose to secrete synovial fluid and hereby reduce friction between two tissues and also works as a cushion for bones, tendons and muscles[2]. The inflammation of the bursa does not appear suddenly but over an amount of time. You can have bursitis in your shoulder, knee, hip, elbow and your big toe.

The Pes Anserine, also called the ‘Goose Foot’ is the insertion of the Musculus Sartorius, Musculus Gracilis and Musculus Semitendinosus who are conjoined proximal on the medial side of the tibia. The three tendons who are important to the Pes Anserine are located superficial to the Medial Collateral Ligament of the knee[3]. The Sartorius and Gracilis are adductors of the leg (they pull the leg towards the median axis of the body.) and the Semitendinosus is part of the Hamstrings who are located at the back of your upper leg. These three muscles are primarily flexors of the knee and internal rotators[4].

Epidemiology /Etiology
[edit | edit source]

Pes Anserine bursitis often occurs when the related muscles are repeatedly used, by doing movements like flexion and adduction. This causes friction and also increases pressure on the bursa. The bursitis can also be due to a trauma like a direct hit in the Pes Anserine region. Some sports like basketball, dancing and most of all running use movements more often then others and are therefore more likely to cause bursitis then others (These movements are flexion and endorotation because the three muscles who are important to the Pes Anserine are primary flexors but also internal rotators. But also adduction and exorotation.). Other important factors are Pes Planus (flat feet), obesity, age, people with valgus deformities (Because the sartorius, gracilis and semimembranosus protect the knee against valgus stress, so when a person has valgus deformities it means that the 3 muscles are not protecting the knee and that could lead to the Pes Anserine syndrome.), incorrect training techniques (Such as neglecting to stretch, doing excessive hill training and sudden increases of mileage.), diabetes [5] and underlying osteoarthritis of the knee[6].

Characteristics/Clinical Presentation
[edit | edit source]

The Pes Anserine Bursitis causes pain on the inside of the knee (mostly during running or taking stairs). Also the region around the bursa will be swollen or tender to touch[7]. It gets most irritated due to activities that require movements like flexion, endorotation but also exorotation and adduction. Pivoting, kicking, squatting or quick movements from side to side. Like in sports mentioned above.

Differential Diagnosis[edit | edit source]

Pes Anserine bursitis is often confused with other medial knee pain. To start with a stress-fracture of the shinbone on the proximedial side will cause pain in the area of the Pes Anserine. Another example is the patellofemoral syndrome or arthritis[8][9][10][11]. Panniculitis[12] is something that happens to people who are obese and will cause just like bursitis more pain at night. Semimembranosus tendinitis will often appear after running of cutting activities just like Pes Anserine bursitis. But also the medial plica syndrome which can cause pain and tenderness on the medial side of the knee are often confused with Pes Anserine bursitis.

Diagnostic Procedures[edit | edit source]

Lateral views of the knee of the patient are very useful to say whether or not out patient has to deal with a stressfracture, arthritis or even Osteochondritis Dissecans. But to be sure that we are not dealing with these injuries we have to take an X-ray. To clarify damage caused to other regions of the medial side of the knee, an MRI is needed. This MRI could prevent you from an unnecessary arthroscopy. Of course you have to correlate the MRI with a physical examination[13][14]. Another procedure is a Lidocaine/Corticosteriod injection in the area of the bursa which will help us determine the contribution of this pathology with the pathology of his overall knee.

Outcome Measures[edit | edit source]

See Outcome Measures Database

Examination[edit | edit source]

First of all it’s important to examine the tightness of the hamstring. The patient is in the supine position. Then we bend the hip 90° and the knee is straightened as far as possible. How far the knee can be extended will indicate if the Hamstrings are tight or not and how tight they are (If you can straighten your knee completely than your Hamstrings are not tight.).

Medical Management
[edit | edit source]

When someone has Pes Anserine bursitis, surgical intervention is something that doesn’t occur. Only when your patient has to deal with a local infection and the standard antibiotic treatment doesn’t work a surgical decompression of the bursa could be a solution.

Physical Therapy Management
[edit | edit source]

Physiotherapy is the mainstay in the treatment of the Pes Anserine syndrome. To temper the pain that the bursa is causing, the most important thing of all is rest. Take nonsteroidal anti-inflammatory drugs (NSAID) to alleviate the pain, restrict movement, alternate ice (An ice massage of 15 minutes every 4-7 hours will reduce the inflammation.) followed by heat and at last some muscle-conditioning exercises[15][16][17].

Sometimes people get an injection which consists of a solution of anaesthetic and steroid. Afterwards a physiotherapist will give a hamstring stretching program and a concurrent closed-chain quadriceps strengthening program that has to repeated several times a day. This will result in less pain at about 6-8 weeks.

Key Research[edit | edit source]

add links and reviews of high quality evidence here (case studies should be added on new pages using the case study template)

Resources
[edit | edit source]

add appropriate resources here

Clinical Bottom Line[edit | edit source]

add text here

Recent Related Research (from Pubmed)[edit | edit source]


Failed to load RSS feed from http://www.ncbi.nlm.nih.gov/entrez/eutils/erss.cgi?rss_guid=1xA-2MTbcyzbSlbtuaqSEJzApadVtyf3nSSQS-bJ7zDtSzS9nL|charset=UTF­8|short|max=10: Error parsing XML for RSS


References[edit | edit source]

 

  1. Moschowitz E. Bursitis of the sartorius bursa: an undescribed malady simulating chronic arthritis. JAMA 1937; 109:1362
  2. Tschirch FTC, Schmid MR, Pfirrmann CWA, et al. Prevalence and size of meniscal cysts, ganglionic cysts, synovial cysts of the popliteal space, fluid filled bursae, and other fluid filled collections in asymptomatic knees on MR imaging. AJR Am J Roentgenol 2003; 180:1431–1436.
  3. Wood LR, Peat G, Thomas E, et al. The contribution of selected non-articular conditions to knee pain severity and associated disability in older adults. Osteoarthritis Cartilage. Jun 2008;16(6):647-53.
  4. Miller RH III. Knee injuries. In: Canale ST, ed. Campbell's operative orthopaedics. St Louis: Mosby; 1998: 1113-1299.
  5. Cohen SE, Mahul O, Meir R, et al. Anserine bursitis and non-insulin dependent diabetes mellitus. J Rheumatol. Nov 1997;24(11):2162-5.
  6. Stuttle FL. The no-name and no-fame bursa. Clin Orthop 1959; 15:197-199.
  7. Forbes JR, Helms CA, Janzen DL. Acute pes anserine bursitis: MR imaging. Radiology 1995; 194:525-527.
  8. Safran MR, Fu FH. Uncommon causes of knee pain in the athlete. Orthop Clin North Am 1995; 26:547-549.
  9. Matsumoto K, Sinusuke H, Ogata M. Juxta-articular bone cysts at the insertion of the pes anserinus. J Bone Joint Surg 1990; 72A:286-290.
  10. Hennigan SP, Schenck CD, Mesgarzadeh M et al. The semimembranosus- tibial collateral ligament bursa. Anatomical study and magnetic resonance imaging. J Bone Joint Surg 1994; 76A:1322-1327.
  11. Kerlan RK, Glousman RE. Tibial collateral ligament bursitis. Am J Sports Med 1988; 16:344-346.
  12. Glencross PM. Medscape: Pes Anserine Bursitis. www.emedicine.medscape.com/article/308694-diagnosis (accessed 26 December 2013).
  13. Zeiss J, Coombs R, Booth R, Saddemi S. Chronic bursitis presenting as a mass in the pes anserine bursa: MR diagnosis. J Comput Assist Tomogr 1993; 17:137-140.
  14. Hall FM, Joffe N. CT imaging of the anserine bursa. AJR Am J Roentgenol 1988; 150:1107-1108.
  15. O'Donoghue DH. Injuries of the knee. In: O'Donoghue DH, ed. Treatment of injuries to athletes, 4th edn. Philadelphia: Saunders; 1987: 470-471.
  16. Larsson LG, Baum J. The syndrome of anserine bursitis: an overlooked diagnosis. Arthritis Rheum 1985; 28:1062-1065.
  17. Brookler MI, Morgan EF. Anserina bursitis. A treatable cause of knee pain in patients with degenerative arthritis. Calif Med 1973; 119:8-10.