Case 4
History:
36 year old female runner with bilateral knee pain
Findings:
MRI of the knee shows fluid signal intensity in the region of the pes anserinus bilaterally.
Diagnosis:
Medial knee bursitis. (Pes Anserinus Bursitis)
Discussion:
Pes anserinus is the anatomic term used to identify the insertion of the conjoined tendons into the anteromedial proximal tibia. From anterior to posterior, pes anserinus is made up of the tendons of the sartorius, gracilis, and semitendinosus muscles. Pes anserine bursitis is most common in young individuals involved in sporting activities and obese middle-aged women. This condition also is common in patients aged 50-80 years who have osteoarthritis of the knees. Pes anserine bursitis can result from acute trauma to the medial knee, athletic overuse, or chronic mechanical and degenerative processes. An occurrence of pes anserine bursitis commonly is characterized by pain, tenderness, and local swelling. MRI is the preferred imaging technique and will typically show hyperintense fluid signal on T2-weighted images.
References:
- Stoller. Tirman. Bredella. Diagnostic imaging. Orthopaedics. 5.58-61. Amrsys.2004.
