Fig. 2

Schematic diagram of surgical incision through direct posterior approach. A A straight incision is made from the midpoint of the line drawn between the posterior border of the tip of the greater trochanter and the posterior superior iliac spine to the posterior border of the greater trochanter. B The gluteus maximus is split along the muscle fibers and pulled laterally on both sides. C The superior portion of the greater sciatic foramen is exposed, and the superior gluteal vessels and nerves are protected and stripped along the periosteum, and the bone fragment of the posterior wall of the acetabulum is exposed