title: The reliability and validity of the measurement of lateral trunk motion in two-dimensional video analysis during unipodal functional screening tests in elite female athletes.
abstract: OBJECTIVE
  To investigate the reliability and validity of the measurement of lateral trunk motion (LTM) in two-dimensional (2D) video analysis of unipodal functional screening tests.
  
  
  METHODS
  Observational study.
  
  
  METHODS
  Research laboratory.
  
  
  METHODS
  Forty-three injury-free female athletes.
  
  
  METHODS
  Knee valgus (KV) and lateral trunk motion (LTM) angles were measured with a standard digital camera during the single leg squat and the single leg drop vertical jump (SLDVJ). Three-dimensional motion analysis was used during the SLDVJ to measure peak external knee abduction moment (pKAM). Intraclass correlation coefficients were calculated to assess the intra- and intertester reliability of the LTM angle. Correlations between 2D angles and pKAM were calculated for the SLDVJ.
  
  
  RESULTS
  Excellent intraclass correlation coefficients for the LTM angle were found within (0.99-1.00) and between testers (0.98-0.99). The sum of KV and LTM was significantly correlated with the pKAM during the SLDVJ for the dominant (r = -0.36; p = 0.017) and non-dominant leg (r = -0.32; p = 0.034), while either angle alone was not.
  
  
  CONCLUSIONS
  LTM can be measured with excellent intra- and intertester reliability. The combination of KV and LTM was moderately associated with pKAM and thus including LTM may aid assessment of movement quality and injury risk.
authors.affiliation: Musculoskeletal Rehabilitation Research Group, Department of Rehabilitation Sciences, Faculty of Kinesiology and Rehabilitation Sciences, KU Leuven, Tervuursevest 101, 3001 Leuven, Belgium. Electronic address: bart.dingenen@faber.kuleuven.be.
authors.forename: Bart
authors.initials: B
authors.lastname: Dingenen
authors.affiliation: Musculoskeletal Rehabilitation Research Group, Department of Rehabilitation Sciences, Faculty of Kinesiology and Rehabilitation Sciences, KU Leuven, Tervuursevest 101, 3001 Leuven, Belgium.
authors.forename: Bart
authors.initials: B
authors.lastname: Malfait
authors.affiliation: Research Institute for Sport and Exercise Sciences, Faculty of Science, Liverpool John Moores University, Liverpool, UK.
authors.forename: Jos
authors.initials: J
authors.lastname: Vanrenterghem
authors.affiliation: Musculoskeletal Rehabilitation Research Group, Department of Rehabilitation Sciences, Faculty of Kinesiology and Rehabilitation Sciences, KU Leuven, Tervuursevest 101, 3001 Leuven, Belgium.
authors.forename: Sabine M P
authors.initials: SM
authors.lastname: Verschueren
authors.affiliation: Musculoskeletal Rehabilitation Research Group, Department of Rehabilitation Sciences, Faculty of Kinesiology and Rehabilitation Sciences, KU Leuven, Tervuursevest 101, 3001 Leuven, Belgium.
authors.forename: Filip F
authors.initials: FF
authors.lastname: Staes
mesh_terms: D000293:Adolescent; D056352:Athletes; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007717:Knee / Q000502:physiology*; D009038:Motion; D009068:Movement / Q000502:physiology*; D015203:Reproducibility of Results; D013177:Sports / Q000502:physiology*; D014741:Video Recording / Q000379:methods*; D055815:Young Adult
keywords: Female athletes; Functional tests; Trunk; Two-dimensional video analysis