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Postural Control Measured Before and after Simulated Ankle Inversion Perturbation Among Patients with Chronic Ankle Instability, Copers, And Controls

2022; RELX Group (Netherlands); Linguagem: Inglês

10.2139/ssrn.4231430

1556-5068

Minsub Oh, Hyunwook Lee, Seunguk Han, J. Ty Hopkins,

Sports injuries and prevention

Background: Postural control measured during single-leg stance and single-leg hop stabilization has been used to estimate sensorimotor function in CAI patients and copers. However, changes in postural control remain unknown, as measured before and after simulated ankle inversion perturbation.Research question: A cross-sectional study was performed to identify any differences in static and dynamic postural control before and after simulated ankle inversion perturbation among chronic ankle instability (CAI) patients, copers, and healthy controls.Methods: Nineteen CAI patients, 19 copers, and 19 controls participated in this study. Subjects performed 3 static and dynamic balance tasks before and after simulated ankle inversion perturbation during single-leg drop landings onto a 25° tilted platform from a height of 30cm. The main outcome measures were the center of pressure (COP) velocity and range from the single-leg stance, as well as the dynamic postural stability index from the single-leg hop stabilization. The Wilcoxon signed-rank test was used to compare posttest and pretest differences in static and dynamic postural control between groups.Results: In the static postural control measures, the CAI group had a higher difference in COP velocity and COP range in the frontal plane (p<0.05 and p<0.05, respectively) than the coper group. In the dynamic postural control measures, the CAI group demonstrated a higher difference in the vertical stability index (VSI) (p<0.05) than the healthy control group.Significance: CAI patients have decreased postural control after simulated ankle inversion perturbation compared to copers and healthy controls, whereas copers have no differences in postural control after simulated ankle inversion perturbation compared to healthy controls. Therefore, CAI patients likely have difficulty integrating and interpreting sensory information while attempting to achieve postural control after simulated ankle inversion perturbation, which may increase their risk for further ankle injury.