Recently used hip resurfacing systems remove bone, ream away the subchondral bone stock and reduce biomechanical properties of the femoral neck. Since much bone was removed from the head, the biomechanical properties decrease. The Onlay Resurfacing technique preserves complete bone stock and individual anatomy without any change in offset or leg length. To quantify the clinical outcome and adverse events a group receiving standard total hip arthroplasty was designed as control. 104 patients with primary osteoarthritis underwent hip onlay resurfacing. Mean aged 51 years, BMI 27,2. An onlay resurfacing system with a cemented femoral cup and a modular cementless acetabular component was used for resurfacing. The control group (n:104) got a standard cementless THA with a standard head size of 32 mm in diameter. All procedures were performed by one surgeon and the same minimal invasive antero lateral approach was used. An identical post-operation procedure with regards to rehabilitation, physiotherapy and medication was performed in both groups. The Harris Hip Score was designed as the primary criteria.Introduction
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