title: Test-retest and interrater reliability of the functional movement screen.
abstract: BACKGROUND
  The Functional Movement Screen (FMS) is a popular test to evaluate the degree of painful, dysfunctional, and asymmetric movement patterns. Despite great interest in the FMS, test-retest reliability data have not been published.
  
  
  OBJECTIVE
  To assess the test-retest and interrater reliability of the FMS and to compare the scoring by 1 rater during a live session and the same session on video.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  Human performance laboratory in the sports medicine center.
  
  
  METHODS
  A total of 21 female (age = 19.6 ± 1.5 years, height = 1.7 ± 0.1 m, mass = 64.4 ± 5.1 kg) and 18 male (age = 19.7 ± 1.0 years, height = 1.9 ± 0.1 m, mass = 80.1 ± 9.9 kg) National Collegiate Athletic Association Division IA varsity athletes volunteered.
  
  
  METHODS
  Each athlete was tested and retested 1 week later by the same rater who also scored the athlete's first session from a video recording. Five other raters scored the video from the first session.
  
  
  METHODS
  The Krippendorff α (K α) was used to assess the interrater reliability, whereas intraclass correlation coefficients (ICCs) were used to assess the test-retest reliability and reliability of live-versus-video scoring.
  
  
  RESULTS
  Good reliability was found for the test-retest (ICC = 0.6), and excellent reliability was found for the live-versus-video sessions (ICC = 0.92). Poor reliability was found for the interrater reliability (K α = .38).
  
  
  CONCLUSIONS
  The good test-retest and high live-versus-video session reliability show that the FMS is a usable tool within 1 rater. However, the low interrater K α values suggest that the FMS within the limits of generalization should not be used indiscriminately to detect deficiencies that place the athlete at greater risk for injury. The FMS interrater reliability may be improved with better training for the rater.
authors.affiliation: Department of Orthopaedic Surgery, Stanford University School of Medicine, CA 94305, USA. rshultz@stanford.edu
authors.forename: Rebecca
authors.initials: R
authors.lastname: Shultz
authors.forename: Scott C
authors.initials: SC
authors.lastname: Anderson
authors.forename: Gordon O
authors.initials: GO
authors.lastname: Matheson
authors.forename: Brandon
authors.initials: B
authors.lastname: Marcello
authors.forename: Thor
authors.initials: T
authors.lastname: Besier
mesh_terms: D056352:Athletes; D001265:Athletic Injuries / Q000517:prevention & control*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000379:methods*; D009068:Movement / Q000502:physiology*; D015203:Reproducibility of Results; D014741:Video Recording; D055815:Young Adult