Posterior Full Body View of the Quadratus Femoris Muscle

Description

Seen from a posterior full-body perspective, the quadratus femoris lies deep in the gluteal region, spanning from the lateral border of the ischial tuberosity to the quadrate tubercle and adjacent intertrochanteric crest of the proximal femur. Superior to it sits the inferior gemellus and obturator internus tendon, while the adductor magnus descends inferomedially and the gluteus maximus forms the superficial posterior covering. Laterally, the muscle approaches the posterior aspect of the femoral neck, where its short, square fiber direction is oriented nearly horizontal compared with the more oblique deep rotators. Functionally, quadratus femoris acts as a strong external rotator and stabilizer of the hip in extension, and its deep position makes it a key landmark when teaching the layered anatomy of the short external rotators. Compression of the quadratus femoris between the ischial tuberosity and the lesser trochanter, termed ischiofemoral impingement, can produce deep buttock or posterior hip pain and may be associated with quadratus femoris edema on MRI. The posterior relationship to the sciatic nerve, which courses superficial to the short rotators as it exits the greater sciatic foramen, also matters when discussing posterior hip approaches and deep gluteal pain syndromes. Small muscle, big consequences. Use this artwork in gross anatomy and kinesiology teaching to clarify the posterior hip rotator layer, or in orthopedic and sports medicine publications covering deep gluteal pain, ischiofemoral impingement, and differential diagnosis of posterior hip symptoms. It also supports surgical education on the posterolateral hip approach by reinforcing the spatial order of gluteus maximus, short external rotators, and the posterior capsule. Anatomical accuracy verified by SciePro's Medical Advisory Board.