Further validation of Normalized Symmetry Index and normalized cross-correlation in identifying gait asymmetry on restricted knee and ankle movement

This paper extends an initial investigation and application of gait asymmetry using wireless gyroscope, normalized Symmetry Index (SI_norm), and normalized cross-correlation (Cc_norm). In this study, one side of the participant´s lower extremity movement is restricted using knee brace or ankle brace. Wireless gyroscopes are then attached to participant´s left thigh, left shank, right thigh and right shank. Measurement data are collected for duration of one minute while participant is walking on a treadmill. The experimental results are satisfactory. Significant asymmetric gait was observed when the participant walks with knee brace or ankle brace on one side of the limbs. The knee brace produced greater asymmetry than ankle brace. These were apparent in both SI_norm and Cc_norm.