Department of Physical Therapy, The Taijukai Foundation (Social Medical Corporation) Kaisei General Hospital, Sakaide, Japan -
Graduate School of Health Science, Kibi International University, Takahashi, Japan.
J Sports Med Phys Fitness. 2021 Dec;61(12):1629-1635. doi: 10.23736/S0022-4707.21.11911-5. Epub 2021 Feb 8.
Rapid knee valgus and knee internal rotation motions in the initial phase of landing are the known mechanisms for anterior cruciate ligament injury, and many studies have been investigated on knee joint peak angle during landing. However, the variability in joint movement during landing has not been fully investigated. This study aimed to compare the coefficient of variation of lower extremity range of motion in patients with anterior cruciate ligament reconstruction and healthy subjects during landing.
In this cross-sectional study, 54 patients with anterior cruciate ligament reconstruction and 44 healthy subjects were enrolled. All participants underwent six trials of single-leg hop landing for maximum safe horizontal distance. The kinematic variables were the coefficient of variation during two discrete (0.05 after initial contact and maximum knee flexion) time points for selected three-dimensional hip and knee joint range of motion. Comparisons were performed between the two groups.
Compared with healthy subjects, patients with anterior cruciate ligament reconstruction had greater the coefficient of variation in hip internal/external rotation range of motion (patients with anterior cruciate ligament reconstruction had 41.9%, healthy subjects had 25.5%; P=0.0018; effect size: 0.32) and knee internal/external rotation range of motion (patients with anterior cruciate ligament reconstruction had 68.4%; healthy subjects had 48.1%; P=0.0014; effect size: 0.32) for periods that spanned 0.05 s from the initial contact.
Patients with anterior cruciate ligament reconstruction could be disadvantageous in ability to control and adapt hip and knee joint rotations when controlling landings.
在落地的初始阶段，膝关节的快速外翻和内旋运动是前交叉韧带损伤的已知机制，许多研究都针对落地时膝关节的峰值角度进行了研究。然而，落地过程中关节运动的可变性尚未得到充分研究。本研究旨在比较前交叉韧带重建患者和健康受试者在落地时下肢运动范围的变异系数。
在这项横断面研究中，纳入了 54 例前交叉韧带重建患者和 44 例健康受试者。所有参与者均进行了 6 次单腿跳跃着地，以达到最大安全水平距离。运动学变量是在两个离散时间点（初始接触后 0.05 秒和最大膝关节屈曲）期间选择的三个维度髋关节和膝关节运动范围的变异系数。对两组进行了比较。
与健康受试者相比，前交叉韧带重建患者髋关节内/外旋运动范围的变异系数更大（前交叉韧带重建患者为 41.9%，健康受试者为 25.5%；P=0.0018；效应量：0.32）和膝关节内/外旋运动范围的变异系数（前交叉韧带重建患者为 68.4%，健康受试者为 48.1%；P=0.0014；效应量：0.32），这两个时间段跨越了从初始接触到 0.05 秒的时间。
前交叉韧带重建患者在控制落地时，可能不利于控制和适应髋关节和膝关节的旋转。
