The gluteus maximus has a dual insertion: the upper and superficial fibres, roughly three-quarters of the muscle, insert into the iliotibial tract alongside the tensor fasciae latae, while the deep lower fibres insert directly onto the gluteal tuberosity of the femur. The iliotibial insertion lets the gluteus maximus tense the iliotibial band and help steady the extended knee and lateral hip. Avulsion of the gluteus maximus origin from the sacrum or posterior ilium is rare but occurs in high-energy sports from explosive hip extension.
| Muscle | |
|---|---|
| Attachment | Superficial and upper fibres (most of the muscle, roughly three-quarters): iliotibial tract. Deep lower fibres: gluteal tuberosity of the femur |
Hip extension and lateral rotation force transmission; IT band tensioning to steady the extended knee during stance
Gluteus maximus avulsion injuries produce buttock pain and hip extension weakness in sprinters and rugby players. MRI shows haematoma at the posterior iliac or sacral origin. Because much of the muscle pulls through the iliotibial band, gluteal weakness and poor hip control in runners are linked to iliotibial band syndrome, and rehabilitation targets gluteal strengthening rather than stretching the band alone. Gluteus maximus strengthening through hip hinge movements (deadlifts, Romanian deadlifts, hip thrusts) is a primary exercise for posterior chain power development.
Rare high-energy posterior hip injury producing buttock pain and extension weakness managed conservatively for most partial avulsions.
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