RESNA 28th Annual Conference - Atlanta, Georgia
Figure 3 is a representative graph for the angle changes of the three body segments with the extensor thrust event progressed. The x axis is non-dimensional time which is defined as the time divided by the duration of extensor thrust event. The y axis is for angular displacements of all the segments with respect to the horizontal axis. The lower leg angle monotonically decreases from 70° to 55°. The lower leg angle is computed from the position vector of the knee with respect to the ankle. The upper leg angle increases from 13° to approximately 40°. The upper leg angle is based on the vector of the hip joint from the knee. Finally, the upper body angle changes from about 85° to 67°. This angle is estimated by the vector of the shoulder marker from the hip joint.