Department of Orthopaedics, Clinical Sciences Lund, Lund University Hospital, Sweden.
Acta Orthop. 2010 Feb;81(1):90-4. doi: 10.3109/17453671003587150.
In recent years, there has been renewed interest in using unicompartmental knee arthroplasty (UKA). Several studies have reported increasing numbers of UKAs for osteoarthritis in patients who are less than 65 years of age, with low revision rates. To describe and compare the use and outcome of UKA in this age group, we have combined data from the Australian and Swedish knee registries.
More than 34,000 UKA procedures carried out between 1998 and 2007 were analyzed, and we focused on over 16,000 patients younger than 65 years to determine usage and to determine differences in the revision rate. Survival analysis was used to determine outcomes of revision related to age and sex, using any reason for revision as the endpoint.
Both countries showed a decreasing use of UKA in recent years in terms of the proportion of knee replacements and absolute numbers undertaken per year. The 7-year cumulative risk of revision of UKA in patients younger than 65 years was similar in the two countries. Patients younger than 55 years had a statistically significantly higher cumulative risk of revision than patients aged 55 to 64 years (19% and 12%, respectively at 7 years). The risk of revision in patients less than 65 years of age was similar in both sexes.
The results of the combined UKA data from the Australian and Swedish registries show a uniformity of outcome between countries with patients aged less than 65 having a higher rate of revision than patients who were 65 or older. Surgeons and patients should be aware of the higher risk of revision in this age group.
近年来，人们对使用单髁膝关节置换术（UKA）重新产生了兴趣。有几项研究报告称，65 岁以下的骨关节炎患者接受 UKA 的数量不断增加，且翻修率较低。为了描述和比较该年龄段 UKA 的使用情况和结果，我们合并了澳大利亚和瑞典膝关节登记处的数据。
分析了 1998 年至 2007 年间进行的超过 34000 例 UKA 手术，并重点关注了 16000 多名 65 岁以下的患者，以确定 UKA 的使用情况并确定翻修率的差异。使用生存分析来确定与年龄和性别相关的翻修结果，以任何翻修原因作为终点。
两国近年来在膝关节置换的比例和每年进行的绝对数量方面都显示出 UKA 使用量的减少。在 65 岁以下的患者中，7 年 UKA 翻修的累积风险在两国相似。55 岁以下的患者翻修的累积风险明显高于 55-64 岁的患者（分别为 19%和 12%，7 年时）。65 岁以下患者的翻修风险在两性之间相似。
来自澳大利亚和瑞典登记处的联合 UKA 数据结果表明，两国之间的结果具有一致性，65 岁以下的患者翻修率高于 65 岁或以上的患者。外科医生和患者应该意识到这个年龄段翻修的风险更高。
