| Objective To explore the characteristics of three-dimensional gait parameters of lower limbs in patients with chronic ankle instability by comparing the differences of lower limb gait parameters between patients with chronic ankle instability and healthy subjects during natural walking.To explore the effect of chronic ankle instability on lower limb movement pattern and biomechanics of patients.The purpose of this study is to provide a scientific basis for further study of the pathogenic mechanism of chronic ankle instability injury,the evaluation of patients’ condition,the formulation of targeted treatment and rehabilitation and the evaluation of curative effect.Methods Twenty patients with unilateral chronic lateral ankle instability were selected in the observation group and 20 healthy subjects were selected in the control group.The gait data of lower limbs of two groups of subjects under natural walking were collected by three-dimensional motion capture system,which mainly included kinematic data and dynamic data of ankle,knee and hip.The gait analysis software was used to process the gait data of the lower limbs of the two groups of subjects,and after the gait cycle of each subject was normalized,the variation curves of the parameters of the two groups in the gait cycle were drawn and compared.We have made a statistical analysis of the regions with great differences in the curves.Results Compared with the control group,in the CAI group,the dorsal extension angle of the ankle increased when the heel touched the ground(P=0.042),the valgus angle decreased when the heel touched the ground(P=0.011),the maximum varus angle increased at the end of the support phase(P<0.01),the maximum valgus angle of the swing phase increased(P<0.01),and the forward and backward force on the ankle decreased when the heel touched the ground(P=0.002).These differences are statistically significant.Compared with the control group,many other parameters of the affected side in the CAI group were significantly different on the curves,but the differences were not statistically significant(P>0.05).Conclusion In the state of natural walking,the ankle varus in the supporting phase of patients with chronic ankle instability increased,and the risk of sprain increased.In order to avoid further damage,the body is compensated by actively increasing the ankle valgus angle of the swing phase in the walking process,increasing the ankle dorsal extension of the support phase,and reducing the force acting on the ankle when it touches the ground to change the mechanical condition of the lower limbs.Other kinematic and mechanical gait parameters of lower limbs of CAI patients also have a certain change trend during natural walking,but a larger sample size is still needed for statistical analysis and verification.Chronic ankle instability causes changes in lower limb kinematics and dynamics,which adversely affects the biomechanics of lower extremities and seriously affects the normal walking mode and motor function of patients. |
