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首页> 美国卫生研究院文献>Journal of Clinical Medicine >Elongation Patterns of the Posterior Cruciate Ligament after Total Knee Arthroplasty
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Elongation Patterns of the Posterior Cruciate Ligament after Total Knee Arthroplasty

机译：总膝关节置换术后后曲韧带的伸长率图案

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摘要

This study aimed to understand the ability of fixed-bearing posterior cruciate ligament (PCL)-retaining implants to maintain functionality of the PCL in vivo. To achieve this, elongation of the PCL was examined in six subjects with good clinical and functional outcomes using 3D kinematics reconstructed from video-fluoroscopy, together with multibody modelling of the knee. Here, length-change patterns of the ligament bundles were tracked throughout complete cycles of level walking and stair descent. Throughout both activities, elongation of the anterolateral bundle exhibited a flexion-dependent pattern with more stretching during swing than stance phase (e.g., at 40° flexion, anterolateral bundle experienced 3.9% strain during stance and 9.1% during swing phase of stair descent). The posteromedial bundle remained shorter than its reference length (defined at heel strike of the level gait cycle) during both activities. Compared with loading patterns of the healthy ligament, postoperative elongation patterns indicate a slackening of the ligament at early flexion followed by peak ligament lengths at considerably smaller flexion angles. The reported data provide a novel insight into in vivo PCL function during activities of daily living that has not been captured previously. The findings support previous investigations reporting difficulties in achieving a balanced tension in the retained PCL.
机译：本研究旨在了解固定后十字韧带（PCL） - 植入物在体内维持PCL功能的能力。为此，在六个受试者中检查PCL的伸长率，使用从视频荧光透视重建的3D运动学，以及膝关节的多体模拟。在此，在整个水平行走和楼梯血统的完全循环中跟踪韧带束的长度变化模式。在整个活动中，前外侧束的伸长率在摆动期间屈曲依赖性模式，而不是姿势相（例如，在40°屈曲，前部束在姿势期间经历了3.9％的菌株和9.1％）。在这两个活动期间，后射束仍然短于其参考长度（在水平步态周期的脚跟击球时定义）。与健康韧带的装载图案相比，术后伸长率图案表明在早期屈曲下韧带的松弛，然后在相当较小的屈曲角度下进行峰值韧带长度。报告的数据在尚未以前捕获的日常生活活动期间提供了对体内PCL功能的新洞察。调查结果支持先前的调查报告难以实现保留的PCL均衡的张力。

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