Fig 3.

(A) An arthroscopic view from the anterolateral portal at the extra-articular space on a right hip shows that 2.4-mm guide pins are introduced along the anterior capsule. (B) Free bone graft is harvested from ipsilateral iliac crest, and 2 parallel 1.5-mm Kirschner wires are inserted. (C) An endoscopic finding on a right hip shows that optimum sized shelf slot is made, and bone cyst in the anterior acetabulum is identified at the back of the slot. (D) The autologous bone graft is inserted into the slot through the guide wires with press-fit fixation. (BC, bone cyst; BG, bone graft; CP, capsule.)