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Updated: May 29, 2026
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Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
Published on: September 18, 2020
Balance assessments for predicting functional ankle instability and stable ankles
Scott E Ross1, Shelley W Linens, Cynthia J Wright
1Department of Health and Human Performance, Virginia Commonwealth University, PO Box 842020, 1015 W. Main St., Richmond, VA 23284-2020, USA. seross@vcu.edu
Gait & Posture
|August 27, 2011
Summary
A multifactorial balance assessment best predicts functional ankle instability (FAI). Resultant center-of-pressure velocity is the strongest single predictor, but error score can be used if force plates are unavailable.
Area of Science:
- Biomechanics
- Sports Medicine
- Physical Therapy
Background:
- Functional ankle instability (FAI) presents balance deficits that may go undetected by standard measures.
- Accurate detection of these deficits is crucial for effective clinical intervention.
Purpose of the Study:
- To identify the most effective balance measure for predicting group membership in individuals with and without FAI.
- To compare the predictive power of various center-of-pressure (COP) measures and an error score.
Main Methods:
- 17 participants with FAI and 17 healthy controls performed single-leg stance trials without vision.
- Balance was quantified using center-of-pressure (COP) velocity, area, and an error score.
- Statistical models were used to determine the best predictor of group membership.
Main Results:
- A multifactorial model incorporating COP velocity, area, and error score achieved 77% correct classification.
- Resultant COP velocity and error score individually predicted group membership with 74% and 71% accuracy, respectively.
- COP area was the least effective single predictor.
Conclusions:
- A multifactorial single-leg balance assessment is superior for identifying functional ankle instability.
- Resultant center-of-pressure velocity is the most sensitive single measure, with error score serving as a viable alternative when force plates are not accessible.
