Wear and migration of highly cross-linked and conventional cemented polyethylene cups with cobalt chrome or Oxinium femoral heads: A randomized radiostereometric study of 150 patients

150 patients who were scheduled to undergo total hip arthroplasty (THA) were randomized to receive one of five implants: the highly cross-linked Reflection All-Poly XLPE cup or the non-irradiated counterpart, the non-cross-linked cemented Reflection All-Poly cup when articulated with Oxinium or cobalt chrome femoral heads, and the Charnley Ogee prostheses. The results from 2 year follow-up indicated that the non-crossed linked cups had higher proximal penetration in comparison to the highly-crossed linked versions. In addition, there was no significant difference found in outcomes between cups articulated with Oxinium or cobalt.