Influence of tibial component rotation on short-term clinical outcomes in Oxford mobile-bearing unicompartmental knee arthroplasty

单室膝关节置换术 医学 牛津膝关节得分 骨关节炎 口腔正畸科 关节置换术 全膝关节置换术 外科 旋转(数学) 几何学 数学 病理 替代医学
作者
Shinya Hayashi,Takafumi Hiranaka,Kenichi Kikuchi,Yasuhiro Hida,Takaaki Fujishiro,Koji Okamoto
出处
期刊:Knee [Elsevier]
卷期号:25 (6): 1222-1230 被引量:32
标识
DOI:10.1016/j.knee.2018.06.016
摘要

Background Malposition of tibial components is an important factor for complications in unicompartmental knee arthroplasty (UKA), but the direct relationship between clinical outcomes and position of tibial component remains unknown. We aimed to investigate whether tibial component rotation in the axial plane could affect clinical outcomes after UKA. Methods A total of 50 patients with anteromedial osteoarthritis of the knee underwent Oxford mobile-bearing UKA in this study. Patient-derived clinical scores using the Oxford Knee Score (OKS) and the functional activities of Knee Society Score (KSSF) were assessed preoperatively, and then after one year and two years following surgery. Postoperative tibial component rotation angles using two reference lines in the axial plane were assessed using three-dimensional computed tomography two weeks postoperatively. External rotation of the tibial component relative to each reference line was considered a positive value. We analysed the sequential change of the OKS and KSSF using repeated measures analysis of variance (P < 0.05). The effects of tibial component rotation on the OKS and KSSF were analysed using linear regression analysis. Results OKS and KSSF showed significant recovery between the preoperative and one-year postoperative period. Rotation angles of tibial components had significant negative correlations with the recovery of the OKS in the two years following UKA. Conclusions Tibial component rotation played an important role in improving clinical outcomes during the two years following Oxford mobile-bearing UKA. A trend towards poor outcome was observed when the tibial component was placed at a higher angle of external rotation. Level of evidence: III.
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