Quantifying levels of function between different subgroups of chronic ankle instability.
The purpose of this original investigation was to determine if selected sensorimotor, mechanical, and self-reported measures are different among chronic ankle instability (CAI) subgroups, healthy control participants, and lateral ankle sprain copers (LAS-Copers). Ninety-four participants volunteered and were categorized into perceived ankle instability (PI) alone (n = 13), recurrent ankle sprains (RAS) alone (n = 12), PI in combination with RAS (PI-RAS; n = 25), LAS-Copers (n = 18), and controls (n = 26). Participants completed self-assessed global, regional, and psychological health-related quality-of-life (HRQOL) questionnaires and assessments of sensorimotor function and mechanical joint laxity. One-way ANOVAs were performed with the intention of reducing the number of original outcomes into a smaller number of predictor variables. Discriminant functional analysis was used to establish which specific measures best differentiate between groups. Eight outcome measures from neural excitability, postural control, static postural control, and HRQOL showed a significant differentiation between five groups (Wilk's λ = 0.26, χ232= 114 45, P < 0.001, canonical correlation = 0.80) and correctly determined only 58.1% of group membership, and the PI-RAS and control groups were the only fit in the proposed model. A different model or other sensorimotor outcomes from more dynamic and complex tasks may be needed for the PI, RAS, and LAS-Coper groups.
College of Sport and Health Science, Ritsumeikan University, Shiga, Japan.
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Terada
Kent State University, Kent, Ohio, USA.
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Bowker
Faculty of Health Sciences University of Sydney, Lidcombe, New South Wales, Australia.
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Hiller
Department of Kinesiology, University of North Carolina at Charlotte, Charlotte, North Carolina, USA.
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Thomas
Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
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Pietrosimone
Department of Rehabilitation Science, University of Kentucky, Lexington, Kentucky, USA.
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Gribble
D000223:Adaptation, Psychological; D000328:Adult; D000704:Analysis of Variance; D016512:Ankle Injuries / Q000503:physiopathology*; D000843:Ankle Joint / Q000503:physiopathology*; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology*; D008297:Male; D004856:Postural Balance; D012008:Recurrence; D057566:Self Report; D011795:Surveys and Questionnaires; D055815:Young Adult
Ankle injury; heterogeneity; joint instability; neuromuscular function