Preliminary results after metal-on-metal hip resurfacing arthroplasty / 中华骨科杂志

ABSTRACT

Objective To introduce the technique of metal-on-metal hip resurfacing arthroplasty,evaluate its preliminary clinical results and review the factors which affect the results.Methods From January 2006 to October 2010,104 patients (116 hips) with osteonecrosis of the femoral head,hip osteoarthritis,hip dyplasia,or ankylosing spondylitis were treated with the total hip resurfacing arthroplasty.Among them,59 patients (66 hips) were male,and 45 patients (50 hips) were female,with an average age of 39.7 years (range,16-67 years).Standard operation technique was performed for all patients with Conserve Plus prosthesis.Each patient was followed up at 1 month,3 months,6 months,1 year postoperatively.Results Three patients (4 hips) were lost,so 101 patients (112 hips) were followed up for an average period of 33 months (range,9-66 months).The average Harris hip score was improved significantly from 37.6±6.3 preoperatively to 91.3±5.3 at final follow-up; 104 hips were excellent,7 hips were good,1 hip was poor,and the excellent and good rate was 99.1％.At final follow-up,the average abduction angle of the acetabutar cup was 42.7°(range,36°-55°); the average femoral prothesis stem-shaft angle was 138.5° (range,132°-146°).Two patients presented with heterotopic ossification (Brook Ⅲ and Brook Ⅱ ).One patient presented with prothesis dislocation,which healed after being treated with manual reduction.There was no femoral neck fracture,infection,or prosthesis loosening.Conclusion With strict patient selection criteria and optimized technique,the short-term results of metal-on-metal hip resurfacing arthroplasty are satisfactory.