Long term results of joint replacement are frequently expressed as survivorship; it therefore becomes increasingly important to have the ability to make valid comparisons between survivorship tables in order to determine accurately the statistical significance of published differences. We present a statistical method for direct comparison of survivorship tables. We have applied this technique to evaluate the survivorship of the unconstrained, uncemented Ring total knee replacement first implanted in 1975 and compare this to contemporaneous constrained prostheses. There is a significant improvement in survival, which suggests a beneficial long-term effect on the bone/implant interface of this changing design concept.

译文

关节置换的长期结果通常表示为生存能力; 因此,具有在生存能力表之间进行有效比较以准确确定已发布差异的统计意义的能力变得越来越重要。我们提出了一种直接比较幸存者表的统计方法。我们已应用此技术来评估首次植入1975年的无约束,无约束环全膝关节置换术的存活率,并将其与同期的约束假体进行比较。存活率有了显着改善,这表明这种不断变化的设计概念对骨骼/植入物界面产生了有益的长期影响。

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