Intra-substance ossification and fracture of the ream of the acetabular roof with a cyst adjacent to the roof. Surgical dislocation of the hip using greater trochanteric osteotomy, removal of the fragment, and repair of the labrum using two suture anchors (visible at the roof of the socket). The CAM lesion has also been removed (Fig. 1.1).

a

c

b

Fig. 1.1 (a) Preoperative x-ray of the left hip showing the fracture of the rim of the acetabular roof (pencil) (b) and

(c) Postoperative hip and hip andfemur x-ray depicting the

fixed trochanteric osteotomy and the removal of the fractured rim (pencil)