Complementary Domain Assessment of Human Lower Limb Joint Angular Kinematics on Modified Gait

Abstract

This study presents subject specific analysis at complementary time, frequency and phase plane domains of entire lower limb joint angular kinematic series during normal and modified gait. Healthy adult subject case study was assessed at human movement lab during normal gait, stiff knee gait and slow running. In vivo and non-invasive assessment was performed with eight camera Qualisys system at 100 Hz acquisition of cartesian coordinates of skin reflective markers at lower limb anatomical selected point. Inverse kinematics was performed using AnyGait v.0.92 and TLEM model to match the size and joint morphology of the stick-figure. Entire series of subject specific hip, knee and ankle joint angular displacements (θ), angular velocities (ω) and angular accelerations (α) at the sagittal plane were assessed at the time, frequency and phase plane domains providing useful information for development of subject specific rehabilitation equipment towards gait restoring. The main novelty and contribution of this study when compared with available literature consists on complementary approach of continuous entire signal analysis, time, frequency and phase analysis which can contribute for prescription of requisites for design of rehabilitation equipment towards normal gait of subjects with stiff knee gait and slow running.