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首页> 外文期刊>Journal of Biomechanics >Measurement of in vivo anterior cruciate ligament strain during dynamic jump landing.
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Measurement of in vivo anterior cruciate ligament strain during dynamic jump landing.

机译：动态跳跃着陆过程中体内前交叉韧带应变的测量。

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Despite recent attention in the literature, anterior cruciate ligament (ACL) injury mechanisms are controversial and incidence rates remain high. One explanation is limited data on in vivo ACL strain during high-risk, dynamic movements. The objective of this study was to quantify ACL strain during jump landing. Marker-based motion analysis techniques were integrated with fluoroscopic and magnetic resonance (MR) imaging techniques to measure dynamic ACL strain non-invasively. First, eight subjects' knees were imaged using MR. From these images, the cortical bone and ACL attachment sites of the tibia and femur were outlined to create 3D models. Subjects underwent motion analysis while jump landing using reflective markers placed directly on the skin around the knee. Next, biplanar fluoroscopic images were taken with the markers in place so that the relative positions of each marker to the underlying bone could be quantified. Numerical optimization allowed jumping kinematics to be superimposed on the knee model, thus reproducing the dynamic in vivo joint motion. ACL length, knee flexion, and ground reaction force were measured. During jump landing, average ACL strain peaked 55+/-14 ms (mean and 95% confidence interval) prior to ground impact, when knee flexion angles were lowest. The peak ACL strain, measured relative to its length during MR imaging, was 12+/-7%. The observed trends were consistent with previously described neuromuscular patterns. Unrestricted by field of view or low sampling rate, this novel approach provides a means to measure kinematic patterns that elevate ACL strains and that provide new insights into ACL injury mechanisms.
机译：尽管最近有文献关注，但前十字韧带（ACL）的损伤机制仍存在争议，并且发病率仍然很高。一种解释是在高风险，动态运动期间体内ACL菌株的数据有限。这项研究的目的是量化跳跃着陆期间的ACL应变。基于标记的运动分析技术与荧光镜和磁共振（MR）成像技术集成在一起，可无创地测量动态ACL应变。首先，使用MR对八个受试者的膝盖进行成像。从这些图像中，勾勒出胫骨和股骨的皮质骨和ACL附着点，以创建3D模型。使用直接放置在膝盖周围皮肤上的反光标记跳下地面时，受试者会进行运动分析。接下来，在标记物就位的情况下拍摄双平面荧光镜图像，以便可以量化每个标记物与下层骨的相对位置。数值优化允许将跳跃运动学叠加在膝盖模型上，从而重现体内动态关节运动。测量ACL长度，膝盖屈曲和地面反作用力。在跳跃着陆期间，当膝盖屈曲角度最低时，平均ACL应变在地面撞击之前达到55 +/- 14 ms（均值和95％置信区间）。相对于其在MR成像期间的长度测得的ACL峰值应变为12 +/- 7％。观察到的趋势与先前描述的神经肌肉模式一致。不受视场或低采样率的限制，这种新颖的方法提供了一种测量运动学模式的方法，该运动学模式可提高ACL应变并提供有关ACL损伤机制的新​​见解。

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