The reliability and criterion validity of 2D video assessment of single leg squat and hop landing

Abstract

The objective was to assess the intra-tester, within and between day reliability of measurement of hip adduction (HADD) and frontal plane projection angles (FPPA) during single leg squat (SLS) and single leg landing (SLL) using 2D video and the validity of these measurements against those found during 3D motion capture. 15 healthy subjects had their SLS and SLL assessed using 3D motion capture and video analysis. Inter-tester reliability for both SLS and SLL when measuring FPPA and HADD show excellent correlations (ICC 0.97-0.99). Within and between day assessment of SLS and SLL showed good to excellent correlations for both variables (ICC 0.72-91). 2D FPPA measures were found to have good correlation with knee abduction angle in 3-D (r=0.79, p=0.008) during SLS, and also to knee abduction moment (r=0.65, p=0.009). 2D HADD showed very good correlation with 3D HADD during SLS (r=0.81, p=0.001), and a good correlation during SLL (r=0.62, p=0.013). All other associations were weak (r<0.4). This study suggests that 2D video kinematics have a reasonable association to what is being measured with 3D motion capture.

Performance in dynamic movement tasks and occurrence of low back pain in youth floorball and basketball players

“…1, was chosen for risk factor analysis. The FPA measured in a similar, but not identical 2D single-leg landing task has shown good correlation with 3D measurements [31]. Using the same methods as this study, Stensrud et al observed moderate to excellent reliability when they measured lower extremity kinematics during the SLVDJ (ICC range = 0.58-0.89) [26].…”

Comparison of Drop Jump and Tuck Jump Knee Joint Kinematics in Elite Male Youth Soccer Players: Implications for Injury Risk Screening

“…Firstly, kinematic data were collected using 2D video footage, which in comparison to "gold standard" 3D motion capture, does not account for movement in all planes of motion and segmental and joint rotations. However, research has shown acceptable agreement between 2D and 3D analysis methods 33,34 , and many of the injury risk factors associated with the knee occur in the sagittal and frontal planes. Additionally, due to financial costs and time-consuming nature of testing, many 3D motion capture systems are impractical for applied settings, especially when attempting to screen large groups of young players in the setting of a soccer academy.…”

Single leg squat ratings by clinicians are reliable and predict excessive hip internal rotation moment

“…Whilst 3D motion capture is a useful tool for elite sports performance and research the time required for data capture and processing makes it difficult to provide immediate clinical information [4].…”

“…Analysis of processed 2D video images has shown good intra-rater reliability (Intra-class correlation coefficients (ICC) > 0.59) [17], inter-rater reliability (ICC > 0.96) and validity (r = 0.81) when assessing knee valgus and hip adduction angles [4]. Annotation of still video pictures whilst more practical than 3D motion capture is still removed from immediate dynamic assessment in vivo.…”