The present evidence indicated the similar performance in survivorship among CoC , CoPc , CoPxl and MoPxl bearing implants , and that all likely have superiority compared with the MoM and MoPc bearing implants in THA procedures .
PURPOSE Although many  total hip bearing implants  are widely used all over the world , simultaneous comparisons across the numerous available bearing surfaces are rare .
The purpose of this study was to compare the survivorship of total hip arthroplasty ( THA ) with six available bearing implants .
Zirconia versus Co-Cr Femoral Heads in Total Hip Arthroplasty: Early Assessment of Wear
Polyethylene wear and associated osteolysis are major limitations to the long-term success of total hip arthroplasty . In vitro laboratory studies suggest polyethylene wear in THA may be substantially reduced with ceramic femoral heads . We evaluated the potential value of zirconia ceramic on conventional polyethylene as an “ alternative bearing ” for total hip arthroplasty in a prospect i ve , r and omized clinical trial in comparison with femoral heads made of Co-Cr-Mo . Patients were evaluated with st and ardized clinical outcome instruments , and measurement of head penetration was performed with computerized wear measurement software .  Study enrollment was halted because of a recall of the zirconia heads .  At that time , 30 total hip arthroplasties with Co-Cr-Mo heads and 30 total hip arthroplasties with zirconia heads had been performed . Mean followup was similar for both groups ( Co-Cr-Mo = 51.7 months ; zirconia = 51.2 months ) . The mean annual head penetration rate was low and similar for both groups ( Co-Cr-Mo = 0.060 mm/year ; and zirconia = 0.055 mm/year ) . In view of the recently reported potential for zirconia ceramics to undergo monoclinic phase transformation in vivo , with result ant increased fracture risk and degradation of wear properties , we do not recommend use of zirconia femoral heads as an “ alternative bearing ” for total hip arthroplasty . Level of Evidence : Level II , therapeutic study . See Guidelines for Authors for a complete description of levels of evidence
The present evidence indicated the similar performance in survivorship among CoC , CoPc , CoPxl and MoPxl bearing implants , and that all likely have superiority compared with the MoM and MoPc bearing implants in THA procedures .
PURPOSE Although many  total hip bearing implants  are widely used all over the world , simultaneous comparisons across the numerous available bearing surfaces are rare .
The purpose of this study was to compare the survivorship of total hip arthroplasty ( THA ) with six available bearing implants .