BACKGROUND AND PURPOSE The prevalence of knee joint replacements (KJR) has been less investigated in situations where the increase in incidence is known. This study investigated the annual and population-based prevalence of KJR and the relationship between the prevalence of KJRs and the incidence of revision surgery. PATIENTS AND METHODS All KJRs performed between 1980 and 2020 were identified from the Finnish Arthroplasty Register (FAR). KJR revisions and removals were extracted from the FAR and hospital discharge registers and patient deaths from Finnish Digital and Population Data Services Agency. We analyzed the annual prevalence by dividing the number of KJR survivors by the population aged 40 or older. The revision burden factor (RBF) was determined by dividing the annual number of revisions by the number of primary and revision KJRs in the population. Proportions of bilateral implants and patients with older KJRs performed 10 or more years earlier were identified. RESULTS KJR prevalence in Finland increased by 298% between 2000 and 2020, reaching 4.0% in 2020. The proportion of patients with bilateral KJRs and those with older KJRs had increased to 37% and 34%, respectively, by 2020. The annual RBF decreased statistically significantly from 1.9% to 0.7% between 1996 and 2020 (proportion ratio, PR 0.37 [95% CI 0.33-0.42]) and was higher among males (PR 1.23 [CI 1.20-1.26]). INTERPRETATION Although the recent rapid increase in KJRs is abating and the RBF is diminishing, it is important to take the continuing increase in the prevalence of KJRs into account when assessing hospitals' future resources.

中文翻译：

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芬兰过去 30 年来膝关节置换术普及率迅速上升，翻修负担减少：基于登记的分析。


背景和目的 在已知发病率增加的情况下，对膝关节置换术 (KJR) 的流行率进行的调查较少。本研究调查了 KJR 的年度患病率和基于人群的患病率以及 KJR 患病率与翻修手术发生率之间的关系。患者和方法 1980 年至 2020 年间进行的所有 KJR 均来自芬兰关节置换术登记册 (FAR)。 KJR 的修订和删除摘自芬兰数字和人口数据服务机构的 FAR 和出院登记册以及患者死亡情况。我们通过将 KJR 幸存者人数除以 40 岁或以上的人口来分析年度患病率。修订负担系数 (RBF) 是通过将年度修订次数除以人群中初级和修订 KJR 的数量来确定的。确定了双侧种植体的比例以及 10 年前或更早进行过旧 KJR 的患者的比例。结果 2000 年至 2020 年间，芬兰 KJR 患病率增加了 298%，2020 年达到 4.0%。到 2020 年，双侧 KJR 患者和老年 KJR 患者比例分别增加至 37% 和 34%。年度 RBF 下降1996 年至 2020 年间，这一比例从 1.9% 降至 0.7%，具有统计学意义（比例，PR 0.37 [95% CI 0.33-0.42]），且男性中更高（PR 1.23 [CI 1.20-1.26]）。解释 尽管近期 KJR 的快速增长正在减弱且 RBF 正在减少，但在评估医院未来资源时，考虑 KJR 患病率的持续增长非常重要。