BACKGROUND The single-limb stance with closed eyes has been widely used to evaluate chronic ankle instability as static balance; however, there was lack of consideration of whether difference in age, frequency of previous ankle sprain or physical ability influenced single-limb stance. RESEARCH QUESTION We hypothesized that the single-limb stance might not reflect subjective ankle instability and function on physical activity in people who perform sports activities. METHODS In total, 102 high school basketball players were recruited to evaluate their physical performance at the beginning of the season. Participants were divided into five groups based on the frequency of previous ankle sprain. Karlsson ankle function score (K score) was considered as a subjective ankle function score, that was divided into various components. Each component and the single-limb stance test with center of pressure (COP) analysis was observed between the frequency of ankle sprains with one-way ANOVA and compared using Spearman's rank correlation coefficient to verify the relationship between the K score and COP. RESULTS For COP parameters, no difference was observed in the history of ankle sprains. The K score was lower in participants with three previous ankle sprains than in those with a different number of ankle sprains for instability, stiffness, running, work activities, support, and total K score for all parameters. There were weak negative correlations (r = -0.19∼-0.35) between K score and COP parameters among participants with no history of ankle sprain or only once. In contrast, there were strong positive correlations (r = 0.69∼0.87) among history of ankle sprain at third. SIGNIFICANCE The single-limb stance might not accurately reflect an athlete's ankle instability and function on physical activity. Clinically, therapists should choose suitable evaluation tools depending on the athlete's activity level to check for chronic ankle instability.

中文翻译：

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单肢姿势是否反映了运动员的慢性踝关节不稳？

背景技术闭眼的单肢姿势已被广泛用于评估慢性踝关节不稳作为静态平衡。但是，没有考虑年龄，先前踝关节扭伤的频率或身体能力的差异是否会影响单肢姿势。研究问题我们假设单肢姿势可能无法反映出进行体育活动的人的主观脚踝不稳定性和对体育活动的功能。方法总共招募了102名高中篮球运动员来评估他们在赛季初的身体表现。根据先前的踝关节扭伤的频率将参与者分为五组。Karlsson踝关节功能评分（K评分）被认为是主观的踝关节功能评分，分为多个组成部分。使用单向方差分析（ANOVA）观察踝扭伤发生频率之间的各个成分和单中心姿势测试，并使用Spearman等级相关系数进行比较，以验证K评分与COP之间的关系。结果对于COP参数，在踝关节扭伤史上未观察到差异。与前三个踝关节扭伤的参与者相比，在所有参数的不稳定性，刚度，跑步，工作活动，支持和总K分数方面，K得分均比那些踝扭伤次数不同的参与者低。在无踝扭伤史或仅有一次扭伤史的参与者中，K评分与COP参数之间存在弱的负相关（r = -0.19〜-0.35）。相反，第三位的踝关节扭伤史之间有很强的正相关（r = 0.69〜0.87）。重要性单肢姿势可能无法准确反映运动员的脚踝不稳定性和身体活动的功能。临床上，治疗师应根据运动员的活动水平选择合适的评估工具，以检查慢性踝关节不稳。