Department of Orthopaedic Surgery and Joint Surgery Centre, Takatsuki General Hospital, Osaka, Japan; Department of Orthopedic Surgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.
Department of Orthopaedic Surgery and Joint Surgery Centre, Takatsuki General Hospital, Osaka, Japan.
Knee. 2021 Jun;30:70-77. doi: 10.1016/j.knee.2021.03.016. Epub 2021 Apr 16.
Lateral unicompartmental knee arthroplasty (UKA) leads to good clinical outcomes for isolated lateral osteoarthritis. However, the impact of the tibial component position on postoperative outcomes in lateral UKA is yet to be determined.
This study investigated the influence of tibial component malposition on clinical outcomes in lateral UKA.
This was a retrospective study of 50 knees (mean age 73.5 years) who underwent lateral UKA between September 2013 and January 2019. The Oxford Knee Score (OKS), Knee Society Score - Knee (KSSK), and Knee Society Score - Function (KSSF) were evaluated. The coronal alignment, posterior slope of tibial component, tibial component rotation relative to Akagi's line (angle α), and femoral anteroposterior (AP) axis (angle β) were measured postoperatively. The average follow up period was 2.3 (range, 1-4.9) years.
Clinical scores were significantly improved after lateral UKA. The mean coronal alignment was 0.9° ± 3.2° varus (range, 9.1° varus to 5.5° valgus), the mean posterior slope was 6.8° ± 3.8° (range, 0.8° to 14.8°). The mean α and β angles, were 4.1° ± 5.8° (range, -9.7° to 16.5°) and 6.7° ± 7.1° (range, -7.0° to 20.5°) external rotation. The angle α had significant negative correlations with postoperative OKS (r = -0.36), KSSK (r = -0.28), and KSSF (r = -0.39), and angle β had significant negative correlations with postoperative OKS (r = -0.34) and KSSK (r = -0.46).
Excessive external rotation of the tibial component could negatively influence the postoperative outcomes of lateral UKA.
外侧单髁膝关节置换术（UKA）可治疗孤立性外侧骨关节炎，获得良好的临床效果。然而，胫骨组件位置对外侧 UKA 术后结果的影响尚未确定。
本研究旨在探讨胫骨组件位置不良对外侧 UKA 临床结果的影响。
这是一项回顾性研究，纳入 2013 年 9 月至 2019 年 1 月期间接受外侧 UKA 的 50 例膝关节（平均年龄 73.5 岁）。评估牛津膝关节评分（OKS）、膝关节协会评分-膝关节（KSSK）和膝关节协会评分-功能（KSSF）。术后测量冠状对线、胫骨组件后倾、相对于 Akagi 线的胫骨组件旋转（角度 α）和股骨前后轴（角度 β）。平均随访时间为 2.3 年（范围 1-4.9 年）。
外侧 UKA 后临床评分显著改善。平均冠状对线为 0.9°±3.2°内翻（范围 9.1°内翻至 5.5°外翻），平均后倾为 6.8°±3.8°（范围 0.8°至 14.8°）。平均 α 和 β 角分别为 4.1°±5.8°（范围-9.7°至 16.5°）和 6.7°±7.1°（范围-7.0°至 20.5°）外旋。角度 α 与术后 OKS（r=-0.36）、KSSK（r=-0.28）和 KSSF（r=-0.39）呈显著负相关，角度 β 与术后 OKS（r=-0.34）和 KSSK（r=-0.46）呈显著负相关。
胫骨组件过度外旋可能对外侧 UKA 的术后结果产生负面影响。
