Neuromechanics Laboratory, Department of Human Movement Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA.
J Biomech. 2011 Jul 7;44(10):1845-51. doi: 10.1016/j.jbiomech.2011.04.010. Epub 2011 May 10.
Anterior Cruciate Ligament (ACL) injury is one of the most serious and costly injuries of the lower extremity, occurring more frequently in females than males. Injury prevention training programs have reported the ability to reduce non-contact ACL injury occurrence. These programs have also been shown to alter an athletes' lower extremity position at initial contact with the ground and throughout the deceleration phase of landing. The purpose of this study was to determine the influence of single-leg landing technique on ACL loading in recreationally active females. Participants were asked to perform "soft" and "stiff" drop landings. A series of musculoskeletal models were then used to estimate muscle, joint, and ACL forces. Dependent t-tests were conducted to investigate differences between the two landing techniques (p<0.05). Instructing participants to land 'softly' resulted in a significant decrease in peak ACL force (p=0.05), and a significant increase in hip and knee flexion both at initial contact (IC) and the time of peak ACL force (F(PACL)). These findings suggest that altering landing technique using simple verbal instruction may result in lower extremity alignment that decreases the resultant load on the ACL. Along with supporting the findings of reduced ACL force with alterations in sagittal plane landing mechanics in the current literature, the results of this study suggest that simple verbal instruction may reduce the ACL force experienced by athletes when landing.
前交叉韧带（ACL）损伤是下肢最严重和最昂贵的损伤之一，女性比男性更容易发生。损伤预防训练计划报告说，它有能力降低非接触性 ACL 损伤的发生。这些计划还表明，它们可以改变运动员在与地面初始接触和着陆减速阶段的下肢位置。本研究的目的是确定单腿着陆技术对女性业余运动员 ACL 负荷的影响。要求参与者进行“软”和“硬”落地。然后使用一系列肌肉骨骼模型来估计肌肉、关节和 ACL 的力。进行了独立样本 t 检验来研究两种着陆技术之间的差异（p<0.05）。指示参与者“轻柔”着陆会导致 ACL 峰值力显著降低（p=0.05），并且在初始接触（IC）和 ACL 峰值力时（F(PACL)）髋关节和膝关节的弯曲度显著增加。这些发现表明，通过简单的口头指导改变着陆技术可能会导致下肢对齐方式的改变，从而降低 ACL 的负荷。除了支持当前文献中矢状面着陆力学改变导致 ACL 力降低的发现外，本研究的结果表明，简单的口头指导可能会降低运动员着陆时经历的 ACL 力。
