In Total Hip Arthroplasty (THA), polyethylene wear reduction is key to implant longevity. Oxidized Zirconium (OxZi) unites properties of a ceramic bearing surface and metal head, producing less wear in comparison to standard Cobalt-Chromium (CoCr) when articulating with Cross-linked polyethylene (XLPE) in vitro. This study investigates in vivo polyethylene (PE) wear, outcomes and complications for these two bearing couples in patients at 5 year follow-up 400 patients undergoing THA across four institutions were prospectively randomised into three groups. Group I received a cobalt-chrome (CoCr) femoral head/ cross-linked polyethylene (XLPE) liner; Group II received an OxZi femoral head/ ultrahigh molecular weight polyethylene (UHMWPE) liner; Group III received an OxZi femoral head/XLPE liner. All bearing heads were 32 mm. Linear wear rate was calculated with Martell computer software. Functional outcome and complications were recorded.Introduction
Methods
The purpose of this study was to evaluate the functional outcome in the medium and long-term of hip resurfacing in comparison with cementless hip replacement in patients under the age of 55. Eighty patients were enrolled between 1999 and 2002. Twenty-four were randomised (11 hip re-surfacing, 13 total hip replacement), 18 refused hip resurfacing and chose cementless total hip replacement with a 32 mm bearing, 38 insisted on re-surfacing. All the patients have been reviewed at a minimum follow-up of 8 years and a mean of 10.1 years. Patients were assessed clinically and radiographically at one year, five years, eight years and ten years. Outcome measures included EQ 5, SF 36, Oxford, Harris hip, UCLA and UCH scores.Introduction
Methods
