Authors: J Berstock M J Barakat S Annamalais R Ahmad G Gillespie R F Spencer
Publish Date: 2010/04/29
Volume: 20, Issue: 8, Pages: 623-627
Abstract
Hip resurfacing is a popular operation for hip joint arthritis It has been performed using hybrid and uncemented components We aim to compare the two techniques functionally and mechanically over a 2 year postoperative period We studied anteroposterior AP radiographs from 30 patients who had undergone hybrid hip resurfacing and 30 patients who had undergone uncemented hip resurfacing using the transgluteal approach to the hip We measured the acetabular offset femoral offset stem/shaft angle medialization of the cup head/neck ratio cup height leg length and the implant seating preoperatively immediately postoperatively 1 and 2 years postoperatively Harris Hip Scores were performed preoperatively and at 1 year postoperatively There was no significant loss of offset and no femoral neck thinning at 2 years postoperatively with no loss of leg length We note a smaller femoral offset and a reduction on average of 287 mm in seating of the femoral cap in the uncemented group when compared to the hybrid group at the 1 year postoperative review Thus we attribute to movement of the femoral component in the first year postoperatively and as such restoration of the femoral offset to the preoperative level Both groups showed an equal significant improvement in the Harris Hip Scores at the 1 year postoperative period when compared to the preoperative score We conclude that uncemented hip resurfacing is statistically as good as the hybrid hip resurfacing with a stable uncemented femoral component relying on biological cancellous fixation rather than cement fixation We also note that in both groups no evidence of neck thinning was noted at the 2 year postoperative period
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