Department of Surgery, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada.
J Arthroplasty. 2013 Feb;28(2):227-33. doi: 10.1016/j.arth.2012.05.019. Epub 2012 Jun 30.
Excessive tibial component overhang during unicompartmental knee arthroplasty (UKA) may cause medial collateral ligament (MCL) impingement, which, in turn, may lead to medial knee pain [Chau et al. Tibial component overhang 226 following unicompartmental knee replacement-does it matter? The Knee. 2009;16(5):310-3]. This study examines MCL loads in 6 human cadaveric knees for different levels of overhang using a robotic testing system. The results indicated no statistically significant difference between the baseline MCL load (no overhang) and the 2-mm overhang (P = .261). However, there were significant differences in MCL load between 2- vs 4-mm (P = .012) and 2- vs 6-mm overhang (P = .022). The loads were almost doubled from 2 to 4 mm of overhang. We conclude that, to minimize pain from excessive MCL loading, surgeons should avoid tibial component overhang greater than 2 mm in unicompartmental knee arthroplasties.
在单髁膝关节置换术中（UKA），胫骨组件过度悬垂可能导致内侧副韧带（MCL）撞击，进而导致内侧膝关节疼痛[Chau 等人。单髁膝关节置换术后胫骨组件悬垂 226 是否重要？膝关节。2009；16(5):310-3]。本研究使用机器人测试系统检查了 6 个人体尸体膝关节在不同悬垂水平下的 MCL 载荷。结果表明，无悬垂时的基线 MCL 载荷（无悬垂）与 2mm 悬垂时（P =.261）之间无统计学差异。然而，在 2 毫米与 4 毫米（P =.012）和 2 毫米与 6 毫米（P =.022）悬垂之间，MCL 载荷存在显著差异。从 2 毫米到 4 毫米的悬垂，载荷几乎增加了一倍。我们得出结论，为了最大程度地减少因过度 MCL 加载引起的疼痛，外科医生应避免在单髁膝关节置换术中胫骨组件悬垂超过 2 毫米。
