Fig. 4A–C.

Right hip of a 40-year-old woman with acetabular protrusio with (A) preoperative medial joint space narrowing, minimal osteophytes at the femoral head, and a lateral center-edge (LCE) angle of > 50°. The patient underwent surgical hip dislocation (B) with circumferential rim trimming and labral reattachment. Postoperatively a LCE angle of > 40° was persistent. (C) Four years after the operation, the hip presented with osteoarthritic changes with osteophyte formation and lateral joint space narrowing.