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Reliability and Accuracy of a Goniometer Mobile Device Application for Video Measurement of the Functional Movement Screen Deep Squat Test.

Authors: Krause DA, Boyd MS, Hager AN, Smoyer EC, Thompson AT, Hollman JH

The squat is a fundamental movement of many athletic and daily activities. Methods to clinically assess the squat maneuver range from simple observation to the use of sophisticated equipment. The purpose of this study was to examine the reliability of Coach’s Eye (TechSmith Corp), a 2-dimensional (2D) motion analysis mobile device application for assessing maximal sagittal plane hip, knee, and ankle motion during a functional movement screen deep squat, and to compare range of motion values generated by it to those from a Vicon (Vicon Motions Systems Ltd) 3-dimensional (3D) motion analysis system.  Test-retest intrarater reliability (ICC 3, 1) for the app at the hip, knee, and ankle was 0.98, 0.98, and 0.79, respectively. The 2D app demonstrated excellent reliability and appeared to be a responsive means to assess for clinical change, with minimum detectable change values ranging from 6 to 7°. These results also suggest that the 2D app may be used as an alternative to a sophisticated 3D motion analysis system for assessing sagittal plane knee and ankle motion; however, it does not appear to be a comparable alternative for assessing hip motion. Reliability and Accuracy of a Goniometer Mobile Device Application for Video Measurement of the Functional Movement Screen Deep Squat Test

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