PURPOSE Medial unicompartmental knee arthroplasty (UKA) has excellent survival rates using one of the two implant designs: mobile bearing (MB) or fixed bearing (FB). There is a lack of studies comparing patient-reported outcomes (PROs) of both implants. This study aimed to document and compare PROs of MB UKA to FB UKA at 6, 12 and 24 months after surgery. METHODS A single high-volume surgeon, retrospective cohort study with prospectively collected data of two groups of UKA patients, with a MB (n = 66) or FB (n = 97) implant. Primary outcome was patient satisfaction (0-10; NRS). Secondary outcomes were pain at rest (NRS), pain during activity (NRS), function (OKS, KOOS-PS), quality of life (EQ-5D-3L), anchor pain, anchor function and anchor recovery. PROs were collected 6, 12 and 24 months postoperatively. The complication rate and revision rate within one year after surgery were recorded. RESULTS For the MB group, the median NRS satisfaction score was 9.0 (8.0-10.0) compared to 9.0 (8.0-9.5) for the FB group at 6 months (p = 0.620). Similar scores were found at 12 and 24 months; both MB 9.0 (8.0-10.0) and FB 9.0 (8.0-10.0) (p = 0.556 and p = 0.522, respectively). There were no statistically significant differences between MB and FB groups in all secondary outcomes postoperatively. CONCLUSION Medial UKA performed by a high-volume surgeon, using a MB or a FB implant, results in excellent patient satisfaction, pain relief, functional improvement and quality of life improvement at 6, 12 and 24 months after surgery. The recommendation and use of one over the other is not justified based on the outcomes in the current study. LEVEL OF EVIDENCE III.

中文翻译：

---

活动轴承或固定轴承内侧单室膝关节置换术后患者满意度无差异。

目的内侧单室膝关节置换术（UKA）使用以下两种植入物设计之一具有出色的存活率：活动轴承（MB）或固定轴承（FB）。缺乏研究比较两种植入物的患者报告结果（PRO）。这项研究旨在记录和比较术后6、12和24个月MB UKA与FB UKA的PRO。方法一项前瞻性队列研究，采用前瞻性队列研究，采用前瞻性收集两组UKA患者（MB = 66）或FB（NF = 97）植入物的数据。主要结果是患者满意度（0-10； NRS）。次要结果是静息痛（NRS），活动时疼痛（NRS），功能（OKS，KOOS-PS），生活质量（EQ-5D-3L），锚点疼痛，锚点功能和锚点恢复。术后6、12和24个月收集PRO。记录术后一年内的并发症发生率和翻修率。结果对于MB组，在6个月时，NRS满意度中位数为9.0（8.0-10.0），而FB组为9.0（8.0-9.5）（p = 0.620）。在12和24个月时发现了类似的分数；MB 9.0（8.0-10.0）和FB 9.0（8.0-10.0）（分别为p = 0.556和p = 0.522）。术后所有次要结局中，MB组和FB组之间无统计学差异。结论大手术量的外科医生使用MB或FB植入物进行UKA手术后，可在术后6、12和24个月获得出色的患者满意度，疼痛缓解，功能改善和生活质量改善。根据当前研究的结果，没有理由推荐和使用一种药物。证据级别III。