Effects of Different Anticipated Conditions on Biomechanical Characteristics of Lower Limbs in Individuals with Chronic Ankle Instability
10.16156/j.1004-7220.2025.04.025
- VernacularTitle:不同预期条件对慢性踝关节不稳人群下肢生物力学特征的影响
- Author:
Ling WANG
1
;
Peng CHEN
;
Huiwu ZUO
;
Xinxin LIU
;
Junjie NIU
;
Kejun LI
;
Xin LIU
;
Haitao LIU
;
Jinwu WANG
Author Information
1. 上海体育大学运动健康学院,上海 200438
- Publication Type:Journal Article
- Keywords:
unanticipated conditions;
chronic ankle instability;
proximal compensation;
recurrent ankle sprain;
jumping
- From:
Journal of Medical Biomechanics
2025;40(4):980-987
- CountryChina
- Language:Chinese
-
Abstract:
Objective The differences in biomechanical characteristics of the lower limbs between individuals with chronic ankle instability(CAI)and healthy individuals during unanticipated and anticipated jumping were compared,in order to provide practical references and ideas for the prevention and treatment of recurrent ankle sprains.Methods Thirty subjects were recruited,including 15 patients with CAI and 15 healthy volunteers.All subjects completed unanticipated and anticipated jumping tests in a random order,with a 1-week interval between the two tests.Kinematic and kinetic data of lower limbs were collected synchronously using Vicon infrared high-speed motion capture system and Kistler three-dimensional force platform.Results At the moment of touchdown,knee flexion angle was significantly greater during unanticipated jumping than that during anticipated jumping(P=0.009),while ankle eversion angle was notably lower(P=0.043).During the early landing phase,unanticipated jumping showed significantly greater peak hip flexion and abduction angles,as well as knee flexion(P=0.038,P=0.036,P=0.04),while peak ankle dorsiflexion and eversion angles were significantly lower(P=0.001,P=0.01)compared to anticipated jumping.Additionally,peak hip abduction moment during unanticipated jumping was significantly higher in patients with CAI than that during anticipated jumping(P=0.028).Conclusions Unanticipated jumping reduced ankle dorsiflexion and eversion angles in individuals with CAI,putting the ankle in an open,sprain-prone position.Individuals with CAI compensated proximally by increasing hip flexion,abduction,knee flexion angles,and hip extension moment to stabilize the ankle.
