Physical Therapy Program, Department of Health and Rehabilitation Sciences, University of Nebraska Medical Center, Omaha, NE, USA; Office of Graduate Studies, University of Nebraska Medical Center, Omaha, NE, USA.
Department of Physical Therapy, School of Education and Health Sciences, University of Dayton, Dayton, OH, USA.
Clin Biomech (Bristol). 2024 Mar;113:106211. doi: 10.1016/j.clinbiomech.2024.106211. Epub 2024 Feb 27.
Individuals with chronic ankle instability often present with clinical and biomechanical abnormalities, however squat biomechanics have not been investigated. The purpose of this study was to compare select clinical assessments and squat biomechanics between individuals with and without chronic ankle instability.
Fifteen individuals with chronic ankle instability and a matched control group were studied. A weight-bearing dorsiflexion lunge test, foot posture, and an in-line half-kneeling motor control test for core stability were assessed. Lower limb 3D bilateral and unilateral squat biomechanics were captured. Groups, limbs and squat tasks were compared using an alpha of 0.05.
Individuals with chronic ankle instability had less static weight-bearing dorsiflexion and failed the core stability test more frequently, but did not differ in foot morphology compared to the controls. When squatting, those with chronic ankle instability demonstrated reduced peak ankle dorsiflexion angles and moments in the involved limb (p < 0.04) during single limb squats and had interlimb differences in ankle dorsiflexion angle as well as hip and knee kinetics (p < 0.04) during double limb squats. In those with chronic ankle instability, there was less overall motion, but higher kinetic demands in single limb versus double leg squatting (p < 0.03).
Individuals with chronic ankle instability had impaired weight-bearing dorsiflexion and showed impaired core stability more often, which accompanied altered squatting mechanics in both variations. Within the limbs with chronic ankle instability, single limb squats showed lesser kinematic demands but higher kinetic demands than double limb squatting.
慢性踝关节不稳定的个体常表现出临床和生物力学异常，但尚未研究蹲姿生物力学。本研究的目的是比较慢性踝关节不稳定患者与无慢性踝关节不稳定患者的特定临床评估和蹲姿生物力学。
研究了 15 名慢性踝关节不稳定患者和一组匹配的对照组。评估了负重背屈弓步试验、足型和用于核心稳定性的直线半跪式运动控制试验。采集了下肢 3D 双侧和单侧蹲姿生物力学数据。使用 0.05 的α值比较组间、肢体间和蹲姿任务。
慢性踝关节不稳定患者的静态负重背屈角度更小，核心稳定性试验失败的频率更高，但与对照组相比，足部形态没有差异。在蹲姿时，慢性踝关节不稳定患者在单腿蹲姿时涉及的肢体的踝关节背屈角度和力矩峰值降低（p<0.04），并且在双腿蹲姿时，踝关节背屈角度以及髋关节和膝关节动力学存在肢体间差异（p<0.04）。在慢性踝关节不稳定患者中，单腿蹲姿的总体运动幅度较小，但单腿蹲姿的动力学需求高于双腿蹲姿（p<0.03）。
慢性踝关节不稳定患者负重背屈受限，核心稳定性较差，这两种情况都伴随着蹲姿力学的改变。在慢性踝关节不稳定的肢体中，单腿蹲姿的运动学需求较小，但动力学需求高于双腿蹲姿。
