Abstract Purpose To determine the preferred knee in patients with both one total and one unicompartmental knee arthroplasty. Method Patients simply with a unicompartmental (UKA) and total knee arthroplasty (TKA) on contralateral sides were retrospectively screened from three senior knee surgeon’s logs over a 15 year period. Patients safe and free from other diseases to affect gait were approached. A total of 16 patients (mean age 70 ± 8) agreed to ground reaction force testing on an instrumented treadmill at a fair pace and incline. A gender-ratio identical group of 16 healthy control subjects (mean age 67 ± 10) and 16 patients with ipsilateral medial knee OA (mean age 66 ± 7) were analysed to compare. Results Radiographically the mode preoperative Kellgren–Lawrence knee grade for each side was 3. Postoperatively, the TKA side had a mean coronal femoral component alignment of 7° and a mean tibial coronal alignment of 89° with a mean posterior slope of 5° in the sagittal plane. The UKA side had a mean coronal femoral component alignment of 7° and a mean tibial coronal alignment of 86° with a mean posterior slope of 4° in the sagittal plane. In 7 patients, the TKA was the first procedure, while 6 for the UKA and 3 done simultaneously. Gait analysis demonstrated in both walking conditions the UKA limb was the preferred side through all phases of loading (p < 0.05) and nearer to normal than the TKA limb when compared to healthy controls and patients with knee OA. The greatest difference was observed between the transition of weight acceptance and midstance (p = 0.008), when 22% more load was taken by the UKA side. Conclusion By using a dynamic metric of an everyday activity, a distinct gait difference between differing arthroplasty types were established. A more natural loading pattern can be achieved with unicompartmentals as compared to total knees. Level of evidence Retrospective comparative study, Level III.

中文翻译：

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单间室膝关节是接受单间室和全膝关节置换术的患者的首选一侧

摘要 目的确定接受全膝关节置换术和单间室膝关节置换术的患者的首选膝关节。 方法根据三位资深膝外科医生 15 年的日志回顾性筛选对侧仅接受单间室 (UKA) 和全膝关节置换术 (TKA) 的患者。我们接触了安全且没有影响步态的其他疾病的患者。共有 16 名患者（平均年龄 70 ± 8 岁）同意在仪器跑步机上以公平的速度和倾斜度进行地面反作用力测试。对性别比例相同的 16 名健康对照受试者（平均年龄 67 ± 10）和 16 名同侧膝关节内侧 OA 患者（平均年龄 66 ± 7）进行分析比较。 结果从影像学角度来看，每侧的术前 Kellgren-Lawrence 膝关节分级均为 3。术后，TKA 侧的股骨假体冠状面平均排列为 7°，胫骨冠状面平均排列为 89°，矢状面平均后斜率为 5°飞机。UKA 侧股骨假体的平均冠状位对齐为 7°，胫骨冠状位平均对齐为 86°，矢状面的平均后斜率为 4°。7 名患者首次进行 TKA，6 名患者进行 UKA，3 名患者同时进行。步态分析表明，在两种行走条件下，UKA 肢体在所有加载阶段都是首选侧（p< 0.05），与健康对照者和膝关节 OA 患者相比，比 TKA 肢体更接近正常。在重量接受和中距的转变之间观察到最大的差异（p= 0.008），当 UKA 侧多承担 22% 的负载时。 结论通过使用日常活动的动态指标，建立了不同关节成形术类型之间明显的步态差异。与全膝相比，单室可以实现更自然的负载模式。 证据级别回顾性比较研究，III 级。