Bone graft, superior and posterior aspect of acetabulum. Large bone bank femoral head with some neck attached (A) is cut in coronal plane (B) so that upper part is slightly more than half of head. C, Full-thickness elliptical piece of bone is cut out with end-cutting reciprocating saw. This concave surface of graft is placed on convex surface of pelvis above and posterior to acetabulum. D, Graft is rotated 90 degrees, and another elliptical cut is made that is slightly smaller than diameter of acetabulum. Several fittings are necessary for graft to have maximal contact with underlying bone. E, Graft is temporarily fixed to underlying bone with two Kirschner wires. F, Four lag screws fix graft to pelvis. High-speed burr and reamers are used to finish contouring graft.