Chinese Journal of Tissue Engineering Research ›› 2024, Vol. 28 ›› Issue (6): 900-904.doi: 10.12307/2023.784

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Effect of visual feedback on landing biomechanics in chronic ankle instability patients

Zhang Lili1, Zhang Xinglai2, Zhang Jie1, Zheng Jiejiao1   

  1. 1Huadong Hospital Affiliated to Fudan University, Shanghai 200040, China; 2Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 200437, China
  • Received:2022-11-08 Accepted:2023-01-05 Online:2024-02-28 Published:2023-07-12
  • Contact: Zheng Jiejiao, Professor, Doctoral supervisor, Huadong Hospital Affiliated to Fudan University, Shanghai 200040, China
  • About author:Zhang Lili, Master, Huadong Hospital Affiliated to Fudan University, Shanghai 200040, China
  • Supported by:
    Multi-Center Clinical Study on Precise Rehabilitation Strategies for Posture Control Disorders Caused by Central Nervous System Diseases, No. 22Y31900200 (to ZJJ, ZLL [project participant])

Abstract:

BACKGROUND: The landing test can effectively observe the biomechanical indexes of the lower limbs of patients with chronic ankle instability, analyze the balance adjustment strategies that affect the stability of chronic ankle instability posture, and provide a valuable reference for chronic ankle instability patients to avoid re-injury and clinical rehabilitation after injury.  
OBJECTIVE: To analyze the effects of vision on the balance of chronic ankle instability and the changes in balance adjustment strategies by observing the kinematics and kinetics of chronic ankle instability patients during landing with and without vision.
METHODS: Totally 31 patients with chronic ankle instability landed on a single leg from a 40 cm platform with their eyes open and closed. The dynamic and kinematic data during the landing process were collected using a three-dimensional motion capture system. The difference in landing between the healthy and the ill side legs under the two conditions was compared by paired t-test.  
RESULTS AND CONCLUSION: (1) Dynamic indexes: The relative value of the peak ground reaction force in the front, rear and vertical directions of the affected ankle joint when eyes were closed was greater than that when eyes were open, and the peak ground reaction force in the vertical direction appeared later than that when eyes were open (P < 0.05). (2) Kinematics indexes: The flexion angle of the knee of the healthy and affected sides when touching the ground was greater under the condition of closed eyes than under the condition of open eyes (P < 0.05). The maximum flexion angle and feedforward angle of the affected knee and ankle were greater than those of the affected side with eyes open (P < 0.05). The time of landing stability was longer than that of eye opening (P < 0.05). (3) It is indicated that under the condition of removing visual input, the peak of ground reaction force increases, the contact angle joint increases, and the time to stabilization of chronic ankle instability is prolonged during landing in patients with chronic ankle instability, which increases the probability of landing injury. Visual maintenance of the balance of chronic ankle instability patients cannot compensate for the vestibular sense and proprioception.

Key words: ankle instability, landing, vision, biomechanics, balance

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