Acetabular bone loss is commonly encountered in patients who undergo revision total hip arthroplasty. Severe bony defects may be associated with chronic pelvic discontinuity, which makes acetabular reconstruction considerably more difficult. Surgeons must understand the current treatment options for patients with severe acetabular bone loss and chronic pelvic discontinuity. Surgeons also should understand how to perform acetabular distraction with the use of a porous acetabular shell and porous, modular metal augments.