Abstract
Acetabular fixation in patients requiring revision total hip arthroplasty who have a nonsupportive superior dome and proximal migration of the acetabular component (Paprosky type IIIA defect) or who have a nonsupportive anterior and posterior column with proximal/medial migration of the acetabular component (Paprosky type IIIB defect) cannot be achieved reliably with the use of a hemispherical porous-coated component alone. Pelvic discontinuity is frequently encountered in patients with severe acetabular bone loss.
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