A Comparison of Wear and Osteolysis for Two Cup Designs: A Retrospectively Matched Study

Although early outcome data from multiple centers have demonstrated that cross-linked polyethylene has substantially reduced total hip arthroplasty (THA) wear rates, some investigators have still reported retroacetabular osteolysis. To examine the role of cup design, we compared the incidence and size of osteolysis lesions among two hemispheric, porous-coated cup designs implanted with cross-linked Marathon polyethylene (DePuy) that incorporated different liner locking mechanisms. One design used a locking ring (Duraloc 100, DePuy) while the other had an interference taper locking mechanism (Pinnacle 100, DePuy).