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. Design Observational study. Setting Research laboratory. Participants Forty-three injury-free female athletes...

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Bibliographic Details
Published in:Physical therapy in sport 2014-05, Vol.15 (2), p.117-123
Main Authors: Dingenen, Bart, Malfait, Bart, Vanrenterghem, Jos, Verschueren, Sabine M.P, Staes, Filip F
Format: Article
Language:English
Subjects:
Adolescent
Athletes
Biomechanics
Confidence intervals
Female
Female athletes
Functional tests
Healthy Volunteers
Humans
Image Processing, Computer-Assisted
Knee - physiology
Ligaments
Motion
Movement - physiology
Physical Medicine and Rehabilitation
Physical therapy
Reproducibility of Results
Sports - physiology
Sports injuries
Sports Medicine
Studies
Trunk
Two-dimensional video analysis
Video Recording - methods
Volleyball
Young Adult
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Summary: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. Design Observational study. Setting Research laboratory. Participants Forty-three injury-free female athletes. Main outcome measures 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.
ISSN:1466-853X
1873-1600
DOI:10.1016/j.ptsp.2013.05.001