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 .
Delta Ceramic-on-Alumina Ceramic Articulation in Primary THA: Prospective, Randomized FDA-IDE Study and Retrieval Analysis
Wear and osteolysis continue to be major reasons for revision surgery in THA .  Ceramic-on-ceramic bearings eliminate polyethylene wear debris . The newest generation of these bearings incorporate nanosized , yttria-stabilized tetragonal zirconia particles producing an alumina matrix composite . We asked whether this new material would perform as well as a conventional bearing in terms of functional hip scores , radiographic migration and osteolysis , complications and survival . As part of a US FDA investigational device exemption study ( G000075 ) , we conducted an initial prospect i ve safety study of 21 alumina matrix composite femoral heads articulating on alumina liners followed by a prospect i ve , r and omized study with 44 more of these articulations and 45 zirconia femoral heads on polyethylene liners .  The minimum followup for all patients was 26 months ( mean , 73 months ; range , 26–108 months ) . Harris hip scores and radiographic findings were similar in the two groups as was survivorship ( trial 95 % versus control 93 % ) . There were three reoperations in the trial group and three in the control group . A fractured head retrieval showed a 33 % monoclinic transformation with an increase in surface roughness from 3 to 5 nm at the main wear zone . While our numbers were insufficient to compare device-related complications , the trial device performed as well as the control device in terms of reoperation , and clinical and radiographic outcome . The alumina matrix composite femoral head on an alumina liner provided high survivorship . 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 .