Midterm Results of a Contemporary, Porous Coated Acetabular System in Patients Undergoing Primary Total Hip Replacement for Degenerative Hip Disease: a Prospective, Multicenter Study

Abstract Background A contemporary, porous coated acetabular implant designed for uncemented insertion was introduced in Europe and Australia in 2007. A similar previous acetabular system was found in several studies at ten to fifteen-year follow-up to demonstrate accelerated polyethylene wear, osteolysis, and early failure. The current study was conducted to determine the mid-term safety and effectiveness of this contemporary acetabular system using highly crosslinked polyethylene (XLPE) and ceramic liners at five-year follow-up. METHODS A prospective, non-randomized study was conducted at eight sites in Canada and the United States. All 148 study participants received a contemporary acetabular shell with proprietary porous coating. The primary outcome was the requirement for revision surgery at five-years post-operatively. Secondary outcomes included a survival analysis, patient-reported outcome measures (PROMs), radiographic failure, and post-operative adverse events. Results At five-year follow-up there was one cup revised for deep infection. No cups were revised for loosening and none were found to be radiographically loose. The overall survival rate with reoperation for any reason was 97.1%. The success rate was 96.8% for polyethylene and 100% for ceramic with no difference in the success rate between either bearing surface (p=1.0). The mean PROMs all improved significantly between pre-operative and five-year post-operative scores (p Conclusion Results from this five-year, multicenter, prospective study indicate excellent survivorship for this acetabular system when used with XLPE or ceramic bearing surfaces.