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Updated: Jan 31, 2026

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
Published on: September 18, 2020
Clinical movement assessments do not differ between collegiate athletes with and without chronic ankle instability
Julie Harriss1, Amina Khan1, Kyeongtak Song1
1Department of Exercise & Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
Objectives:
To determine if overall Landing Error Scoring System-17 (LESS-17) and Fusionetics scores differ between collegiate athletes with and without chronic ankle instability (CAI). We also aimed to determine if the rate of specific movement errors during the LESS-17 and Fusionetics differed between the groups.
Design:
Case-Control.
Setting:
Clinical Sports Medicine Facility.
Participants:
Ninety-nine athletes from six Division I NCAA sports were eligible for the investigation. Forty-nine of those participants were classified as having CAI and fifty were classified as uninjured controls.
Main Outcome Measures:
An overall Lower Extremity Fusionetics score and individual task scores were calculated based on movement errors made during a double limb, double-limb with heel lift, and single limb squat. A LESS-17 score was calculated based on movement errors made during a 30 cm drop jump.
Results:
No differences were found between groups for the LESS-17 (p = 0.51), overall Lower Extremity Fusionetics (p = 0.49), and individual Fusionetics tasks (p > 0.36). More individuals with CAI made an uncontrolled trunk movement during a single-limb squat than uninjured controls (p < 0.01).
Conclusions:
Overall movement quality, as assessed by the LESS-17 and Fusionetics, did not differ between collegiate athletes with and without CAI. The rate of making specific movement errors also did not differ between groups.
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