Fig. 2

Intrapoerative photographs (a, c) and schemas (b, d) at the fourth revision hip arthroplasty. a, b Type IV bone defect of the American Academy of Orthopaedic Surgeons (arrowheads) with pelvic discontinuity in the acetabular surface; c, d stabilization of the acetabulum with reconstruction plate (P) for the posterior column and KT plate (KT) for the anterior column, followed by reconstruction by structural bone grafting (SB) at the lateral portion of the acetabulum