Tamura Akihiro, Shimura Keita, Inoue Yuri
Department of Physical Therapy, School of Health Sciences at Narita, International University of Health and Welfare, Narita, Chiba, Japan.
School of Health Sciences, Tokyo International University, Kawagoe, Saitama, Japan.
Orthop J Sports Med. 2022 Jul 28;10(7):23259671221112966. doi: 10.1177/23259671221112966. eCollection 2022 Jul.
Chronic ankle instability (CAI) in soccer players can increase the risk of recurrent ankle varus sprains and damage the articular surface of the ankle joint, thus increasing the risk of osteoarthritis. It is important to understand the biomechanical characteristics of the support leg during kicking in soccer players with CAI.
PURPOSE/HYPOTHESIS: The purpose of this study was to clarify the kinematics of the kicking motion of soccer players with CAI. It was hypothesized that at the point before ball contact when the support leg makes flat-foot contact with the ground, soccer players with CAI will land with ankle inversion in the support leg during a side-foot kick compared with players without CAI.
Controlled laboratory study.
The study cohort included 19 male college soccer players (mean age, 20.5 ± 0.9 years) with greater than 8 years of soccer experience who were recruited from August 2019 to March 2020. Of these athletes, 10 had CAI and 9 had no CAI in the support leg, as diagnosed according to the Cumberland Ankle Instability Tool. Kinematic data for the trunk, hip, knee, and foot of the support leg during a side-foot kick were obtained using a 3-dimensional, motion-analysis system. The Mann-Whitney test or Student test was selected to identify differences in variables between the CAI and non-CAI groups.
There were no significant differences in physical characteristics between the CAI and non-CAI groups. At the point when the support leg made flat-foot contact with the ground, the players with CAI had more eversion of the hindfoot with respect to the tibia (-28.3° ± 12.1° vs -13.9° ± 14.2°; = .03), a more varus alignment of the knee (26.0° ± 10.7° vs 13.7° ± 10.5°; = .03), and a lower arch height index (0.210 ± 0.161 vs 0.233 ± 0.214; = .046) compared with non-CAI players.
Significant differences between players with and without CAI were seen in the support leg kinematics at flat-foot contact with the ground during the kicking cycle.
The biomechanical alignment of the support leg during a side-foot kick in players with CAI may reflect a subconscious attempt to avoid inversion of the foot and further ankle sprains.
足球运动员的慢性踝关节不稳定（CAI）会增加踝关节内翻扭伤复发的风险，并损害踝关节的关节面，从而增加患骨关节炎的风险。了解患有CAI的足球运动员在踢球时支撑腿的生物力学特征很重要。
目的/假设：本研究的目的是阐明患有CAI的足球运动员踢球动作的运动学。假设在支撑腿平足着地且球触地前的瞬间，与没有CAI的运动员相比，患有CAI的足球运动员在侧足踢球时支撑腿会出现踝关节内翻着地。
对照实验室研究。
研究队列包括19名男性大学足球运动员（平均年龄20.5±0.9岁），他们于2019年8月至2020年3月被招募，足球经验超过8年。根据坎伯兰踝关节不稳定工具诊断，这些运动员中，10人支撑腿患有CAI，9人支撑腿没有CAI。使用三维运动分析系统获取侧足踢球时支撑腿的躯干、髋、膝和足部的运动学数据。选择曼-惠特尼检验或学生检验来确定CAI组和非CAI组之间变量的差异。
CAI组和非CAI组在身体特征方面没有显著差异。在支撑腿平足着地时，与非CAI运动员相比，患有CAI的运动员后足相对于胫骨有更多外翻（-28.3°±12.1°对-13.9°±14.2°；P = 0.03），膝关节内翻角度更大（26.0°±10.7°对13.7°±10.5°；P = 0.03），足弓高度指数更低（0.210±0.161对0.233±0.214；P = 0.046）。
在踢球周期中支撑腿平足着地时，患有CAI和没有CAI的运动员在支撑腿运动学方面存在显著差异。
患有CAI的运动员在侧足踢球时支撑腿的生物力学对线可能反映了一种避免足部内翻和进一步踝关节扭伤的潜意识尝试。
