Study of Knee and Hip Joints' Moment Estimation by Biomechanical Simulation During Various Motion Changes

Abstract

In this study, biomechanical parameters of lower limb joints due to motion changes have been estimated to develop the 3-D model that can analyze dynamic gait simulation for wearable walking assistant robot. Motion data which include stair up and sit-to-stand condition of human motion upon normal person with no nervous system and musculoskeletal disease was obtained from 3-D motion analysis system. As a result, it was observed that maximum torque value of hip joint (1.26Nm/kg) was much higher than knee joint (0.49Nm/kg) during stair up stage in sagittal plane. On the other hand, maximum torque value of knee joint (0.72Nm/kg) was higher than hip joint (0.18Nm/kg) during sit-to-stand stage using walker. And maximum torque value of knee joint (1.20Nm/kg) was higher than hip joint (0.87Nm/kg) during sit-to-stand stage with no constraints. In this study, biomechanical characteristics of lower limb joint upon various conditions were presented and these data can be applied to biomedical research field that include wearable walking assistant robot.