Inoue Atsuo, Arai Yuji, Nakagawa Shuji, Inoue Hiroaki, Yamazoe Shoichi, Kubo Toshikazu
Department of Orthopaedics, Japanese Red Cross Kyoto Daiichi Hospital, Kyoto, Japan; Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
J Arthroplasty. 2016 Jan;31(1):142-5. doi: 10.1016/j.arth.2015.07.024. Epub 2015 Jul 17.
Good outcomes have been reported with both fixed-bearing and mobile-bearing unicompartmental knee arthroplasty (UKA). However, overcorrected alignment could induce the progression of arthritis on the non-arthroplasty side. Changes of limb alignment after UKA with both types of bearings (fixed bearing: 24 knees, mobile bearing: 28 knees) were investigated. The mean difference between the preoperative standing femoral-tibial angle (FTA) and postoperative standing FTA was significantly larger in mobile bearing UKA group. In fixed-bearing UKA, there must be some laxity in MCL tension so that a 2-mm tension gauge can be inserted. In mobile-bearing UKA, appropriate MCL tension is needed to prevent bearing dislocation. This difference in MCL tension may have caused the difference in the correction angle between the groups.
固定平台和活动平台单髁膝关节置换术（UKA）均已报道有良好的治疗效果。然而，过度矫正的对线可能会导致非置换侧关节炎的进展。对两种平台类型（固定平台：24例膝关节，活动平台：28例膝关节）的UKA术后肢体对线变化进行了研究。活动平台UKA组术前站立位股胫角（FTA）与术后站立位FTA的平均差值显著更大。在固定平台UKA中，内侧副韧带（MCL）张力必须有一定松弛度，以便能插入2毫米的张力测量仪。在活动平台UKA中，需要适当的MCL张力以防止平台脱位。MCL张力的这种差异可能导致了两组之间矫正角度的差异。
