Department of Sports and Health Science, Shandong Sport University, Jinan 250102, China; Department of Graduate School, Harbin Sport University, Harbin 150006, China.
Department of Sports and Health Science, Shandong Sport University, Jinan 250102, China.
Gait Posture. 2024 Oct;114:90-94. doi: 10.1016/j.gaitpost.2024.09.008. Epub 2024 Sep 15.
Lateral ankle sprain (LAS) usually occurs during landing from heights among people with chronic ankle instability (CAI). Although the kinematics when landing on the flat surface has been reported, no studies have explored the effect of different heights on the landing strategies using a trapdoor device among people with CAI.
Do people with CAI adopt different landing strategies when drop-landing on the trapdoor device from three heights?
Thirty-one participants with CAI (24 males and 7 females, age=21.1±1.8 years, height=176.9±7.4 cm, body mass=71.9±9.2 kg, injured side=18 R&13 L) were recruited. They dropped from three different heights (low height (16 cm), medium height (23 cm), high height (30 cm)) with their affected foot landing on a movable surface of a trapdoor device, which was tilted 24° inward and 15° forward to simulate LAS. Kinematic data was collected using a twelve-camera motion capture system. One-way analysis of variance with repeated measures was used to compare the differences between the three heights.
Significant height effects were detected in the peak ankle inversion angle (p=0.009, η=0.280) and angular velocity (p<0.001, η=0.444), and the peak ankle plantarflexion (p=0.002, η=0.360), knee flexion (p<0.001, η=0.555), and hip flexion (p=0.030, η=0.215) angles at the time of peak ankle inversion. Post-hoc tests showed that all the angles and velocities were higher at a low height than at medium (p: 0.001-0.045, d: 0.14-0.44) and high heights (p: 0.001-0.023, d: 0.28-0.66), except for the ankle plantarflexion angle, which was lower at a low height than at medium (p<0.001, d=0.44) and high (p=0.021, d=0.38) heights.
People with CAI adopt a protective strategy during drop-landing at medium and high heights compared to a low height. This strategy involves increased ankle dorsiflexion angle as well as knee and hip flexion angles.
慢性踝关节不稳（CAI）患者在高处落地时通常会发生外侧踝关节扭伤（LAS）。尽管已经报道了在平坦表面上着陆时的运动学情况，但尚无研究使用陷阱门装置探讨 CAI 患者从不同高度着陆时的策略。
CAI 患者从三个高度跳下时，在陷阱门装置上的降落策略是否不同？
招募了 31 名 CAI 患者（24 名男性和 7 名女性，年龄=21.1±1.8 岁，身高=176.9±7.4cm，体重=71.9±9.2kg，受伤侧=18R&13L）。他们从三个不同的高度（低高度（16cm），中高度（23cm），高高度（30cm））用受影响的脚降落在陷阱门装置的可移动表面上，该装置向内倾斜 24°，向前倾斜 15°，以模拟 LAS。使用十二相机运动捕捉系统收集运动学数据。使用重复测量的单向方差分析比较了三个高度之间的差异。
在峰值踝关节内翻角度（p=0.009，η=0.280）和角速度（p<0.001，η=0.444）以及峰值踝关节跖屈（p=0.002，η=0.360），膝关节屈曲（p<0.001，η=0.555）和髋关节屈曲（p=0.030，η=0.215）角度时，发现了显著的高度效应。事后检验表明，与中（p：0.001-0.045，d：0.14-0.44）和高（p：0.001-0.023，d：0.28-0.66）高度相比，所有角度和速度在低高度时均较高，除了踝关节跖屈角度在低高度时低于中（p<0.001，d=0.44）和高（p=0.021，d=0.38）高度。
与低高度相比，CAI 患者在中高高度跳下时采用保护策略。该策略涉及增加踝关节背屈角度以及膝关节和髋关节的屈曲角度。
