The semimembranosus has its own bursa separate from the gastrocnemius-semimembranosus bursa (Baker cyst) — it lies at the direct arm insertion of the semimembranosus on the posteromedial tibia. Isolated semimembranosus bursitis produces posteromedial knee pain worsened by knee flexion and direct palpation at the semimembranosus insertion. It is frequently confused with a Baker cyst but does not communicate with the knee joint.
Reduces friction between the semimembranosus and medial gastrocnemius during knee flexion
Semimembranosus bursitis is distinguished from a Baker cyst by its anatomical position (at the posteromedial tibial condyle at the semimembranosus insertion rather than in the popliteal fossa) and by its non-communication with the knee joint on ultrasound. Aspiration and corticosteroid injection resolves most cases.
Isolated semimembranosus bursal inflammation at the posteromedial tibia producing posterior knee pain managed with aspiration and injection.
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