Reliability and Validity of a 2-D Video Digitizing System during a Static and a Dynamic Task

in Journal of Sport Rehabilitation
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The SMART™ software system offers low-cost kinematic analysis through digitization of video from a single camera. The reliability and validity of this product have not been reported.


To assess the reliability and validity of the SMART software during a simple static task and dynamic task.


Test–retest to compare assumed neutral and goniometrically measured joint angles in the sagittal plane of the lower extremity.


Research laboratory.


7 in a static task, 16 young, physically active in a dynamic task.


Measurement error of the SMART system ranged from 0.29° ± 1.98° to 11.07° ± 1.77°. The interrater reliability (ICC2,1) values ranged from .60 to .92 for the static task and from .76 to .89 for the dynamic task.


Based on the results of both studies, the SMART system offers a low-cost alternative for reporting single-plane kinematics during an individual frame of video during static stances and slow dynamic tasks with strong reliability and reasonable validity.

Gribble is with the Dept of Kinesiology, University of Toledo, Toledo, OH 43528. Hertel is with the Kinesiology Program, University of Virginia, Charlottesville, VA 22904-4407. Denegar and Buckley are with the Dept of Kinesiology, Penn State University, University Park, PA 16801.