The hamstring tendons originate from the ischial tuberosity as a combined conjoined tendon before the three separate muscles diverge, with the biceps femoris inserting laterally on the fibular head and the semitendinosus and semimembranosus inserting medially on the tibia. Proximal hamstring tendinopathy at the ischial tuberosity is an important cause of deep buttock pain in runners and rowers, distinct from the more common mid-belly hamstring strains.
Hip extension and knee flexion force transmission
Proximal hamstring tendinopathy produces a deep aching at the ischial tuberosity that is reproduced by sitting on hard surfaces, hill running, and sustained hip flexion with knee extension. The Puranen-Orava test of straight leg stretching in standing reproduces the pain specifically. Unlike mid-belly hamstring strains, proximal tendinopathy requires a load management approach with progressive tendon loading rather than the stretching that initially seems intuitive but compresses and irritates the tendon against the ischium.
Degenerative overload of the hamstring origin at the ischial tuberosity producing deep buttock pain with sitting and hill running, managed with load modification and progressive tendon loading in non-compressive hip positions.
Complete avulsion of the hamstring origin from the ischial tuberosity during explosive hip flexion with knee extension, producing a palpable gap and significant strength loss requiring surgical reattachment within 4 weeks for best outcomes.
