Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine · 2026
From compensation to decompensation: The threshold effect of recurrence frequency on shock absorption and movement strategies in individuals with chronic ankle instability during single-leg drop landing.
СтатьяНазвание и аннотация: Перевод в очереди
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Wang Zilong, Wang Pengfei, Wang Ting, Xuan Bojie, Zheng Weihua, Xu Yining, Meng Lingyue, Zhang Qiuxia, Wang Xiangdong
Аннотация
OBJECTIVES: To compare lower limb biomechanics during single-leg drop landings between individuals with low (2-4/year) and high (≥5/year) chronic ankle instability (CAI) recurrence frequencies.
DESIGN: Cross-sectional study.
SETTING: Biomechanics laboratory.
PARTICIPANTS: Sixty males with unilateral CAI, stratified into High-CAI (n = 30) and Low-CAI (n = 30) groups.
MAIN OUTCOME MEASURES: Peak vertical ground reaction force (vGRF), time to peak vGRF, vertical loading rate (LR), leg stiffness, and lower extremity kinematics.
RESULTS: High-CAI participants demonstrated greater peak vGRF, shorter time to peak vGRF, higher LR, and greater hip flexion, hip abduction, and ankle inversion at initial contact than the Low-CAI group (all p ≤ 0.048; ηp2 = 0.066-0.275). Group × side interactions occurred for knee flexion, ankle inversion, and LR (p = 0.005-0.033; ηp2 = 0.076-0.128). Simple-effects analyses showed the unstable side of the Low-CAI group exhibited less knee flexion than its stable side, whereas the unstable side of the High-CAI group exhibited greater ankle inversion and LR than both the unstable side of the Low-CAI group and its stable side (all p ≤ 0.040; d = 0.350-1.221).
CONCLUSIONS: High-frequency CAI recurrence (≥5 times/year) induces a maladaptive landing strategy with altered proximal compensations and impaired shock absorption. Frequency-based stratification is essential for optimizing management.
DESIGN: Cross-sectional study.
SETTING: Biomechanics laboratory.
PARTICIPANTS: Sixty males with unilateral CAI, stratified into High-CAI (n = 30) and Low-CAI (n = 30) groups.
MAIN OUTCOME MEASURES: Peak vertical ground reaction force (vGRF), time to peak vGRF, vertical loading rate (LR), leg stiffness, and lower extremity kinematics.
RESULTS: High-CAI participants demonstrated greater peak vGRF, shorter time to peak vGRF, higher LR, and greater hip flexion, hip abduction, and ankle inversion at initial contact than the Low-CAI group (all p ≤ 0.048; ηp2 = 0.066-0.275). Group × side interactions occurred for knee flexion, ankle inversion, and LR (p = 0.005-0.033; ηp2 = 0.076-0.128). Simple-effects analyses showed the unstable side of the Low-CAI group exhibited less knee flexion than its stable side, whereas the unstable side of the High-CAI group exhibited greater ankle inversion and LR than both the unstable side of the Low-CAI group and its stable side (all p ≤ 0.040; d = 0.350-1.221).
CONCLUSIONS: High-frequency CAI recurrence (≥5 times/year) induces a maladaptive landing strategy with altered proximal compensations and impaired shock absorption. Frequency-based stratification is essential for optimizing management.