Gluteus medius
Its posterior third is covered by the gluteus maximus, its anterior two-thirds by the gluteal aponeurosis, which separates it from the superficial fascia and integument.The fibers of the muscle converge into a strong flattened tendon that inserts on the lateral surface of the greater trochanter.More specifically, the muscle's tendon inserts into an oblique ridge that runs downward and forward on the lateral surface of the greater trochanter.The posterior fibres of gluteus medius contract to produce hip extension, lateral rotation and abduction.Thus, its preservation and the accurate anatomical reconstruction of the femoral offset and anteversion is of quintessential importance for the result of surgical hip replacement.