Figure 4.

Gait animation sequence of subject-specific OpenSim musculoskeletal leg model created for subject JW. Green arrows indicate ground reaction force acting on the foot and medial and lateral knee contact forces acting on the femur. Contact forces were calculated with a deformable knee contact model and are consistent with measurements made by the subject’s instrumented tibial prosthesis. Muscle color indicates muscle activation state based on the subject’s EMG data (red = active, blue = inactive). Pink spheres indicate motion capture surface marker locations on the shank and thigh.