Pelvic osteotomy is a major surgical procedure that involves reorienting the socket of the hip joint to correct biomechanical problems caused by abnormal development of the hip socket. It is the procedure of choice in young patients with this type of developmental abnormality. The hip socket, or acetabulum, is cut free from the pelvis, and is rotated to provide better coverage of the femoral head. Bone screws are used to maintain the new alignment. This reconstruction has good longevity as healthy joint cartilage in the socket now covers the whole femoral head.