The semitendinosus ischial bursa lies between the semitendinosus proximal tendon and the ischial tuberosity, at the origin of the medial hamstring component. It is distinct from the ischiogluteal bursa (which lies between the ischial tuberosity and the overlying skin) by its deeper position beneath the semimembranosus and semitendinosus origins.
This deep ischial bursa may become inflamed in conjunction with proximal hamstring tendinopathy or after acute hamstring origin injuries, contributing to deep ischial pain with sitting and hamstring loading. On MRI it appears as a small fluid signal directly beneath the conjoined medial hamstring tendon at the ischial tuberosity, and is best differentiated from the ischiogluteal bursa by its deep position and its relationship to the tendon.
Inflammation of the semitendinosus ischial bursa concurrent with proximal hamstring tendinopathy produces deep ischial pain and tenderness on direct pressure at the ischial tuberosity, with MRI distinguishing bursitis from partial tendon tear, managed by load modification, injection, and eccentric rehabilitation.
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