CONVERGENT VALIDITY AND RELIABILITY OF A NEW 2D MOTION ANALYSIS SYSTEM FOR QUANTIFICATION OF HIP AND KNEE KINEMATICS DURING OVER-GROUND RUNNING

Abstract

Introduction: Analysis of running gait is necessary for prevention of hip and knee injuries. Two dimensional (2D) motion analysis systems are being widely used at a clinical level for quantication of kinematic parameters during running gait analysis. Observational methods of assessing gait are largely dependent on clinicians' ability to quantify and analyze the kinematic data in a reliable manner. Under these circumstances, use of motion analysis software with inbuilt running gait analysis protocols help to improve the reliability of data. To investigate the convergent validity, Objective: inter- and intra-rater reliability of a 2-D motion analysis system (GaitON®) for quantication of hip and knee kinematics at initial contact during running. 21 healthy male recreational runners were Methods: recorded using a clinical 2D video setup during over-ground running. Two blinded raters quantied joint angles on video using GaitON® and Kinovea software. The intra-rater reliability [intra-class correlation coefcient (ICC 3, 1)], interrater reliability, the limits of agreement (LOA) in the Bland-Altman plot were also determined. The a Results: ngles quantied using GaitON® were signicantly correlated with the angles quantied in Kinovea with r = 0.997; p = 0.01 for the hip and r = 0.982; p = 0.01 for the knee. The ICC values (intra-rater reliability) for the hip and knee were 0.998 and 0.990 respectively whereas ICC values (inter-rater reliability) of 0.996 and 0.978 were computed for the hip and knee respectively. The st Conclusion: rong validity and excellent inter- and intra-rater reliability results establish a concrete foundation for use of GaitON® as a tool for evaluating the running gait of a patient in a clinical setup.