The semimembranosus has its own bursa separate from the semimembranosus-gastrocnemius bursa that forms Baker cysts. This isolated semimembranosus bursa reduces tendon-bone friction at the posteromedial tibial condyle. Its enlargement produces a posteromedial knee swelling distinct from the typical posterior Baker cyst.
Reduces friction between the semimembranosus tendon and the posteromedial tibia during knee flexion
Isolated semimembranosus bursitis is distinguished from a Baker cyst by its posteromedial rather than posterior popliteal location. Ultrasound identifies the bursa between the semimembranosus tendon and the tibia. It is managed with aspiration and injection when symptomatic.
Posteromedial knee bursal swelling from isolated semimembranosus-tibia friction managed with aspiration and injection.
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