Kinematic Factors when Wheelchair Casters Lose Contact with the Ground

Abstract

This research looked at the combined center of gravity of both the wheelchair and user when wheelchair casters lose contact with the ground, examining both skilled wheelchair users and those just learning. We focused on the point of contact between the wheelchair and floor, using an infrared camera to measure the combined reaction with the floor and used a three-dimensional movement analyzer to measure the movement of the contact point in order to identify the kinematic qualities of this movement. Our findings suggest that after the casters reach their highest point from the ground, in order to maintain balance and reverse the posteriorly located center of gravity relative to the contact point of the wheelchair and ground, it is necessary for the combined center of gravity of the user and wheelchair to shift anteriorly, relative to the wheelchair's contact point with the ground.