Fig. 5

Gluteus medius (and gluteus minimus) originates from the tip of the greater trochanter and terminates on the posterior-superior border (posterior-lateral surface) of the ilium. a In patients with long-term unreduced hip joint dislocation, secondary osteoarthritis and pseudoarthrosis, the gluteus medius and gluteus minimus are pushed away from the surface of the ilium by the pseudoacetabular bone osteophyte, which increases muscle tension and causes failure to reduce the joint prosthesis. b When the pseudoacetabular bone osteophyte is removed, the muscle tension decreases dramatically, and the joint prosthesis can be easily reduced. c This intraoperative photograph shows the osteophyte and the gluteus medius