Validity and sensitivity of the Longitudinal Asymmetry Index to detect gait asymmetry using Microsoft Kinect dataReportar como inadecuado




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1 MSk Lab 2 MIMETIC - Analysis-Synthesis Approach for Virtual Human Simulation UR2 - Université de Rennes 2, Inria Rennes – Bretagne Atlantique , IRISA D6 - MEDIA ET INTERACTIONS 3 M2S - Laboratoire Mouvement Sport Santé 4 IGB - Institut de génie biomédical Montreal

Abstract : Gait asymmetry information is a key point in disease screening and follow-up. Constant Relative Phase CRP has been used to quantify within-stride asymmetry index, which requires noise-free and accurate motion capture, which is difficult to obtain in clinical settings. This study explores a new index, the Longitudinal Asymmetry Index ILong which is derived using data from a low-cost depth camera Kinect. ILong is based on depth images averaged over several gait cycles, rather than derived joint positions or angles. This study aims to evaluate 1 the validity of CRP computed with Kinect, 2 the validity and sensitivity of ILong for measuring gait asymmetry based solely on data provided by a depth camera, 3 the clinical applicability of a posteriorly mounted camera system to avoid occlusion caused by the standard front-fitted treadmill consoles and 4 the number of strides needed to reliably calculate ILong. The gait of 15 subjects was recorded concurrently with a marker-based system MBS and Kinect, and asymmetry was artificially reproduced by introducing a 5cm sole attached to one foot. CRP computed with Kinect was not reliable. ILong detected this disturbed gait reliably and could be computed from a posteriorly placed Kinect without loss of validity. A minimum of five strides was needed to achieve a correlation coefficient of 0.9 between standard MBS and low-cost depth camera based ILong. ILong provides a clinically pragmatic method for measuring gait asymmetry, with application for improved patient care through enhanced disease, screening, diagnosis and monitoring.

Keywords : sensitivity analysis CRP Kinect gait asymmetry





Autor: Edouard Auvinet - Franck Multon - Victoria Manning - Jean Meunier - Justin Cobb -

Fuente: https://hal.archives-ouvertes.fr/



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