Naito Yohei, Tone Shine, Kobayashi Gai, Hasegawa Masahiro
Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Tsu, JPN.
Cureus. 2025 Aug 27;17(8):e91084. doi: 10.7759/cureus.91084. eCollection 2025 Aug.
Purpose This study aimed to compare postoperative clinical outcomes and soft tissue laxity between functional alignment (FA) and mechanical alignment (MA) in robot-assisted total knee arthroplasty (TKA). Methods Thirty-one FA and 31 MA TKAs performed using a robotic system were included in this retrospective study. Range of motion (ROM), the 2011 Knee Society Score (2011 KSS), and the Forgotten Joint Score-12 (FJS-12) at 6 weeks, 3 months, and 6 months after TKA, respectively, were compared between the two groups. Intraoperative laxities were compared between the two groups. Results Although no significant differences were noted in postoperative ROM and the 2011 KSS, the FJS-12 scores at 3 and 6 months after TKA were significantly higher in the FA group (64.4 and 68.4) than those in the MA group (51.9 and 57.0) (p<0.05 and p<0.05). At 90° flexion, the medial laxity of 1.1 mm in the FA group was significantly lower than that of 2.3 mm in the MA group (p < 0.001). Conclusion FA TKA was superior to MA TKA in achieving better FJS-12 and greater medial stability at 90° flexion.
目的 本研究旨在比较机器人辅助全膝关节置换术（TKA）中功能对线（FA）和机械对线（MA）术后的临床疗效及软组织松弛度。方法 本回顾性研究纳入了31例采用机器人系统进行的FA TKA和31例MA TKA。分别比较两组患者TKA术后6周、3个月和6个月时的活动范围（ROM）、2011年膝关节协会评分（2011 KSS）及遗忘关节评分-12（FJS-12）。比较两组患者术中的松弛度。结果 尽管两组术后ROM和2011 KSS无显著差异，但FA组TKA术后3个月和6个月时的FJS-12评分（分别为64.4和68.4）显著高于MA组（分别为51.9和57.0）（p<0.05和p<0.05）。在90°屈曲时，FA组1.1 mm的内侧松弛度显著低于MA组的2.3 mm（p < 0.001）。结论 在实现更好的FJS-12评分及90°屈曲时更大的内侧稳定性方面，FA TKA优于MA TKA。
