title: Reliability of the modified Foot Posture Index.
abstract: BACKGROUND
  The Foot Posture Index (FPI) has been advocated as a simple and convenient tool to assess static foot posture in a clinical setting. Although published studies have indicated that the FPI has good intrarater reliability and moderate interrater reliability, these studies were conducted on a previous version of the tool that used eight criteria to score a patient's foot posture. The revised tool has only six criteria (FPI-6). The purpose, therefore, of this study was to investigate the intrarater and interrater reliability of the revised version of the FPI.
  
  
  METHODS
  Three different raters used the FPI-6 to twice evaluate 92 feet from 46 individuals.
  
  
  RESULTS
  Intrarater reliability was high but interrater reliability was only moderate. In addition, using the raw score generated by the FPI-6 to classify feet into one of five categories did not improve agreement between raters.
  
  
  CONCLUSIONS
  The FPI-6 should be used with extreme caution and may actually have limited value, especially from a research perspective.
authors.affiliation: Department of Rehabilitation Sciences, Program in Physical Therapy, Northern Arizona University, Flagstaff, AZ 86011, USA.
authors.forename: Mark W
authors.initials: MW
authors.lastname: Cornwall
authors.forename: Thomas G
authors.initials: TG
authors.lastname: McPoil
authors.forename: Michael
authors.initials: M
authors.lastname: Lebec
authors.forename: Bill
authors.initials: B
authors.lastname: Vicenzino
authors.forename: Jodi
authors.initials: J
authors.lastname: Wilson
mesh_terms: D000328:Adult; D005260:Female; D005528:Foot / Q000502:physiology*; D006801:Humans; D008297:Male; D010808:Physical Examination / Q000379:methods*; D011403:Pronation / Q000502:physiology*; D015203:Reproducibility of Results; D013484:Supination / Q000502:physiology*