目的:本研究旨在比较两种不同设计概念模型的交叉保留全膝关节置换术的中屈旋转松弛度:中性关节线倾角的对称表面设计和内翻关节线倾角的不对称表面设计。
方法:评估了63个接受交叉保留全膝关节置换术的膝关节。在导航监测下,对膝盖施加了手动最大被动旋转应力而没有加速。术前和术后内外旋转角度测量为30°,45°,60°,膝关节弯曲90°。
结果:与30°的术前水平相比,术后内部旋转松弛度明显增加,45°,60°,和所有受试者的90°屈曲(平均9.7°vs11.1°,10.6°vs11.6°,11.2°vs12.9°,和13.2°vs14.9°;p分别为0.01、0.04、0.001和0.008)。30°时术后外旋松弛度较术前明显下降,45°,60°,所有受试者屈曲90°(平均10.8°vs6.8°,12.5°vs9.4°,12.8°vs10.0°,和11.3°对9.5°;p分别<0.0001、<0.0001、<0.0001和0.0008)。术后总旋转松弛度明显下降,与术前水平相比,所有受试者在30°和45°屈曲时(平均20.4°vs17.9°,和23.1°对21.1°;p分别为0.002和0.04)。不对称设计的全膝关节置换术术后总旋转松弛度明显小于30°对称设计的全膝关节置换术,45°,和60°屈曲(平均19.3°对15.8°,22.8°vs18.7°,和24.4°vs20.8°;p分别为0.03、0.03和0.02),而在90°屈曲时没有观察到显着差异。
结论:与对称表面设计相比,不对称的表面设计导致交叉保留的全膝关节置换术中,在中屈范围内旋转松弛度较低。
方法:III.
OBJECTIVE: This study aimed to compare midflexion rotational laxity between two different design concept models of cruciate-retaining total knee arthroplasty: symmetrical surface design of neutral joint line obliquity and asymmetrical surface design of varus joint line obliquity.
METHODS: Sixty-three knees that underwent cruciate-retaining total knee arthroplasty were evaluated. Manual maximum passive rotational stress without acceleration was applied to the knees under navigation monitoring. Pre-operative and post-operative internal and external rotational angles were measured at 30°, 45°, 60°, and 90° knee flexion.
RESULTS: The post-operative internal rotational laxity was significantly increased compared with pre-operative levels at 30°, 45°, 60°, and 90° flexion among all subjects (mean 9.7° vs 11.1°, 10.6° vs 11.6°, 11.2° vs 12.9°, and 13.2° vs 14.9°; p = 0.01, 0.04, 0.001, and 0.008, respectively). The post-operative external rotational laxity was significantly decreased compared to pre-operative levels at 30°, 45°, 60°, and 90° flexion among all subjects (mean 10.8° vs 6.8°, 12.5° vs 9.4°, 12.8° vs 10.0°, and 11.3° vs 9.5°; p < 0.0001, < 0.0001, < 0.0001, and 0.0008, respectively). The post-operative total rotational laxity significantly decreased, compared with pre-operative levels, at 30° and 45° flexion among all subjects (mean 20.4° vs 17.9°, and 23.1° vs 21.1°; p = 0.002 and 0.04, respectively). The post-operative total rotational laxity was significantly smaller in asymmetrically designed total knee arthroplasty than in symmetrically designed total knee arthroplasty at 30°, 45°, and 60° flexion (mean 19.3° vs 15.8°, 22.8° vs 18.7°, and 24.4° vs 20.8°; p = 0.03, 0.03, and 0.02, respectively), whereas no significant difference was observed at 90° flexion.
CONCLUSIONS: Compared to symmetrical surface design, asymmetrical surface design resulted in lower rotational laxity at the midflexion range in cruciate-retaining total knee arthroplasty.
METHODS: III.