A small bursa between the MCL and the semimembranosus tendon reduces friction during knee motion. Its inflammation — secondary to MCL sprains, pes anserinus bursitis, or medial meniscal tears — produces the medial knee pain pattern that is difficult to distinguish clinically from the adjacent structures. Ultrasound localises the bursal inflammation to the MCL undersurface specifically.
Reduces friction between the semimembranosus tendon and the overlying tibial collateral ligament during knee motion
MCL-semimembranosus bursitis produces a very specific medial knee pain reproduced by direct palpation at the posteromedial tibial condyle just posterior to the MCL. It is distinguished from true MCL sprain (ligament palpation pain) and pes anserinus bursitis (more distal on the tibia) by its location and the sonographic appearance of a bursal fluid collection.
Medial knee bursal inflammation managed with targeted ultrasound-guided corticosteroid injection.
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