title: Critical review of self-reported functional ankle instability measures: a follow up.
abstract: OBJECTIVE
  Determine which ankle instability questionnaire predicts subject's ankle instability status based on a minimum accepted criteria for FAI (MC_FAI).
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  Large Midwestern University.
  
  
  METHODS
  College aged subjects (n = 1127 19.6 ± 2.1 years) from a university population were recruited for this study. Any volunteer, regardless of ankle injury history was included in the study.
  
  
  METHODS
  The independent variables were the score on three self-report ankle instability questionnaires: Ankle Instability Instrument, Cumberland Ankle Instability Tool, and Identification of Functional Ankle Instability. Subjects completed the questionnaires for their dominant limb during a single testing session. The dependent variable was created based on the previously established MC_FAI. This was established as at least one ankle sprain and at least one episode of giving way. Data were modeled using a chi-square and multinomial logistic regression. 95% confidence intervals were calculated for the resulting odds ratios.
  
  
  RESULTS
  A test of the full model with all three predictors against MC_FAI revealed that only the IdFAI (X² = 457.09, p = .001) had a significant relationship with the outcome variable. The IdFAI had an overall prediction rate of 87.8%.
  
  
  CONCLUSIONS
  This analysis illustrates that IdFAI is a good overall option for predicting ankle stability status by self-reported questionnaire.
authors.affiliation: Department of Kinesiology, Indiana University, 1025 E. 7th Street, Bloomington, IN, USA. Electronic address: jesimon@indiana.edu.
authors.forename: Janet
authors.initials: J
authors.lastname: Simon
authors.affiliation: Department of Health Promotion and Human Performance, Weber State University, Ogden, UT, USA.
authors.forename: Matthew
authors.initials: M
authors.lastname: Donahue
authors.affiliation: Department of Kinesiology, Indiana University, 1025 E. 7th Street, Bloomington, IN, USA.
authors.forename: Carrie L
authors.initials: CL
authors.lastname: Docherty
mesh_terms: D016512:Ankle Injuries / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D000843:Ankle Joint / Q000503:physiopathology*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D008297:Male; D011379:Prognosis; D016059:Range of Motion, Articular / Q000502:physiology*; D011795:Surveys and Questionnaires; D055815:Young Adult
keywords: Ankle Instability Instrument; Cumberland Ankle Instability Tool; Functional ankle instability; Identification of Functional Ankle Instability; Subjective outcome measure