金属・金属表面置換型人工股関節置換術の経験

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  • Experience of Metal on Metal Resurfacing Hip Arthroplasty

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Objective: Metal on metal resurfacing hip arthroplasty is a procedure which can save local bone source. We have resurfaced 4 joints with this procedure since 2001. The objective of this paper is to report the short-term results.<BR>Subjects and methods: The subjects were 2 male and 2 female adults. Their average age at the time of operation was 49 years (range 46-52 years) . All of the resurfaced THAs were done for osteoarthritis. We used a metal on metal bearing hip system named Cormet (Corin Japan KK) . We used a lateral approach involving osteotomy of the greater trochanter because this would protect the artery feeding the femoral head. The mean follow-up period was 2 years (range 1-3 years) .<BR>Results: The mean JOA score improved from 54 points (33-69 points) before surgery to 90 points (89-97 points) after surgery. So far, there has been no indication of loosening of the implants, although two screws that were fixed to the greater trochanter have loosened. Also, none of the patients has yet experienced any pain, and all have indicated satisfaction with the treatment.<BR>Conclusions: With those middle aged patients, we were concerned about which treatment would be more beneficial, osteotomy or THA. The historical failures of resurfacing THA resulted from production of debris. To avoid that problem, a metal on metal bearing device has been applied. In our cases, all the patients are satisfied, but we do not know the long-term results, so continued observations will have to be made.

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