How is semimembranosus tendinitis differentiated from pes anserine bursitis?

Updated: May 08, 2018
  • Author: P Mark Glencross, MD, MPH, FACOEM, FAAPMR; Chief Editor: Milton J Klein, DO, MBA  more...
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The MCL bursa is located at the anterior border of the MCL. It may be palpable during knee flexion as a small, tender, rounded nodule moving into the leading edge of the MCL. Pain can be elicited by palpating the bursa or by briskly extending the knee from a position of 90° flexion. Pes anserine tendonitis may exist exclusively or in conjunction with bursitis. So-called snapping tendinitis of the semitendinosus tendon is usually thought of as distinct from pes anserine bursitis, but some authorities classify it as the same inflammatory disorder.

Semimembranosus tendinitis can occur with running or cutting activities. This condition is characterized by swelling over the posteromedial aspect of the knee and by tenderness with resisted flexion or valgus strain. An insertional enthesopathy of the semimembranosus has also been described.

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