The intertrochanteric fossa is the depression on the posterior surface of the femoral neck between the greater and lesser trochanters, providing the insertion for the obturator externus tendon. It is bounded laterally by the posteromedial edge of the greater trochanter and medially by the lesser trochanter.
The intertrochanteric fossa is the surgical landmark for obturator externus tendon release in hip impingement and for posterior femoral neck approaches. Ischiofemoral impingement can compress the quadratus femoris adjacent to this fossa. Avascular necrosis of the femoral head is staged by MRI assessment of the fossa region. The obturator externus tendon insertion into this fossa is visualised during posterior hip arthroscopy.
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