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A Mouse Model of Ankle-Subtalar Complex Joint Instability
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Quantifying levels of function between different subgroups of chronic ankle instability.

M Terada1, S Bowker2, C E Hiller3

  • 1College of Sport and Health Science, Ritsumeikan University, Shiga, Japan.

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|June 14, 2016
PubMed
Summary

Chronic ankle instability (CAI) subgroups and healthy controls show differences in sensorimotor and self-reported measures. Current models only accurately classify perceived ankle instability with recurrent ankle sprains (PI-RAS) and control groups.

Keywords:
Ankle injuryheterogeneityjoint instabilityneuromuscular function

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Area of Science:

  • Biomechanics and Motor Control
  • Sports Medicine
  • Rehabilitation Science

Background:

  • Chronic ankle instability (CAI) encompasses various subgroups, including perceived instability (PI), recurrent ankle sprains (RAS), and combined PI with RAS (PI-RAS).
  • Differentiating these CAI subgroups and comparing them to healthy controls and lateral ankle sprain copers (LAS-Copers) is crucial for targeted interventions.
  • Existing research often aggregates CAI, potentially masking distinct functional deficits.

Purpose of the Study:

  • To investigate differences in sensorimotor, mechanical, and self-reported measures among distinct CAI subgroups, LAS-Copers, and healthy controls.
  • To identify specific measures that effectively differentiate these groups.
  • To evaluate the utility of current assessment models in classifying CAI phenotypes.

Main Methods:

  • Ninety-four participants were categorized into PI alone, RAS alone, PI-RAS, LAS-Copers, and control groups.
  • Participants underwent assessments of sensorimotor function, mechanical joint laxity, and completed health-related quality-of-life (HRQOL) questionnaires.
  • One-way ANOVAs and discriminant functional analysis were employed to analyze group differences and identify differentiating measures.

Main Results:

  • Eight outcome measures, including neural excitability, postural control, and HRQOL, significantly differentiated the five groups.
  • The discriminant model achieved 58.1% correct group membership classification.
  • Only the PI-RAS and control groups were accurately classified within the proposed model, indicating limitations for other groups.

Conclusions:

  • Sensorimotor and self-reported measures can differentiate between CAI subgroups and healthy controls, but with limited accuracy for certain phenotypes.
  • The current assessment model may not be sufficiently sensitive to distinguish PI, RAS, and LAS-Coper groups.
  • Further research incorporating dynamic and complex sensorimotor tasks is recommended to improve classification accuracy for all CAI-related groups.