Department of Exercise Sciences, Brigham Young University, Provo, Utah, USA.
Scand J Med Sci Sports. 2023 Jul;33(7):1116-1124. doi: 10.1111/sms.14342. Epub 2023 Mar 5.
Although chronic ankle instability (CAI) patients display altered reactive joint kinematics after inversion perturbation, little is known about the effects of anticipation on reactive joint kinematics among CAI, coper, and control groups.
To assess changes in reactive joint kinematics after different inverted landing situations including planned- and unplanned-condition among groups of CAI, coper, and control.
Sixty-six volunteers participated (22 per group). Participants completed three trials of both planned and unplanned single-leg landing onto an inverted force platform while reactive joint kinematic data were collected from initial-contact to 200 ms after initial-contact. Two-way repeated measures ANOVAs were used to examine the differences between condition (planned-, unplanned-conditions) and group (CAI, coper, control).
There were significant group by condition interactions for total ankle displacement in the frontal plane (p < 0.01) and maximum ankle inversion velocity (p = 0.01). CAI patients displayed increased ankle displacement (p < 0.01) and maximum inversion velocity (p < 0.01) under the unplanned condition compared to the planned condition. However, copers did not show any differences in ankle displacement and maximum inversion velocity between the two conditions.
CAI patients displayed greater changes in ankle joint displacement and maximum ankle inversion velocity occurred after inversion perturbation under unplanned condition compared with copers and controls. Current data suggest that altered reactive joint kinematics under the unanticipated condition in CAI patients may contribute to the condition of CAI after ankle sprains. Clinicians should focus on rehabilitation programs to recover and/or develop feedback control for CAI patients during functional movements under unanticipated condition to prevent further injuries.
尽管慢性踝关节不稳（CAI）患者在受到外翻干扰后表现出关节运动学的改变，但对于 CAI、共患和对照组中，预期对反应性关节运动学的影响知之甚少。
评估 CAI、共患和对照组在不同的反向落地情况下（包括计划和非计划条件）的反应性关节运动学的变化。
66 名志愿者参与（每组 22 名）。参与者完成了三次计划和非计划单腿落地到倒置力平台的测试，同时在初始接触后 200 毫秒内收集反应性关节运动学数据。使用双向重复测量 ANOVA 来检查条件（计划、非计划条件）和组（CAI、共患、对照组）之间的差异。
在额状面的总踝关节位移（p<0.01）和最大踝关节内翻速度（p=0.01）方面存在显著的组间条件交互作用。与计划条件相比，CAI 患者在非计划条件下显示出更大的踝关节位移（p<0.01）和最大内翻速度（p<0.01）。然而，共患组在两种条件下的踝关节位移和最大内翻速度没有显示出任何差异。
与共患和对照组相比，CAI 患者在非计划条件下受到外翻干扰后，踝关节关节位移和最大踝关节内翻速度的变化更大。目前的数据表明，CAI 患者在非预期条件下反应性关节运动学的改变可能导致踝关节扭伤后 CAI 的状况。临床医生应在功能运动下，针对 CAI 患者，重点关注康复计划，以恢复和/或发展反馈控制，从而预防进一步的损伤。
