Kurihara Yasushi, Ohsugi Hironori, Kuwae Yutaka, Fukaya Taizan, Fujikawa Daigo
Department of Physical Therapy, Faculty of Social Work Studies, Josai International University, Togane, JPN.
Home Medical Care, Keisei Koiwa Home Medical Clinic, Edogawa-ku, JPN.
Cureus. 2025 Jul 21;17(7):e88417. doi: 10.7759/cureus.88417. eCollection 2025 Jul.
Aim The aim of this study is to investigate the association between the loading rate (LR) during single-leg drop landing (SDL) and biomechanical factors contributing to ankle sprains (AS).
Seventeen healthy young men (mean age: 19.8 ± 0.8 years) were included in this study. A three-dimensional motion analyzer and a floor reaction force sensor were used to analyze SDLs conducted from a 20-cm-high platform onto a floor positioned 30 cm away. The change in lower limb joint angles from landing to the point of maximum vertical floor reaction force was calculated. Additionally, peroneus longus parameters, including maximum muscle tension and timing, were measured using musculoskeletal modeling software. Associations of the LR with changes in lower limb joint angles and peroneus longus parameters were analyzed using correlation analysis (p<0.05).
The LR was negatively correlated with the hip flexion, knee flexion, and ankle dorsiflexion angles (r = -0.781, -0.649, and -0.489; p = 0.0002, 0.005, and 0.047, respectively). In contrast, the LR was positively correlated with the timing of the peroneus longus muscle (r = 0.672, p = 0.003). No other correlations were observed.
A higher LR during SDL was associated with reduced sagittal plane joint motion and delayed peroneus longus activation, both of which are biomechanical factors linked to AS onset. These findings suggest that the LR may serve as a useful marker for identifying individuals at elevated risk of AS.
目的 本研究旨在探讨单腿下落着地（SDL）过程中的加载速率（LR）与导致踝关节扭伤（AS）的生物力学因素之间的关联。
本研究纳入了17名健康青年男性（平均年龄：19.8±0.8岁）。使用三维运动分析仪和地面反作用力传感器分析从20厘米高的平台落到30厘米外地面上的SDL。计算从着地到最大垂直地面反作用力点下肢关节角度的变化。此外，使用肌肉骨骼建模软件测量腓骨长肌参数，包括最大肌肉张力和时机。使用相关性分析（p<0.05）分析LR与下肢关节角度变化和腓骨长肌参数之间的关联。
LR与髋关节屈曲、膝关节屈曲和踝关节背屈角度呈负相关（r = -0.781、-0.649和-0.489；p分别为0.0002、0.005和0.047）。相比之下，LR与腓骨长肌的时机呈正相关（r = 0.672，p = 0.003）。未观察到其他相关性。
SDL期间较高的LR与矢状面关节运动减少和腓骨长肌激活延迟有关，这两个都是与AS发病相关的生物力学因素。这些发现表明，LR可能是识别AS高风险个体的有用标志物。
