5.1.6 The foot segment

In the biomechanical model, the foot segment extends from the ankle to the distal end of the foot and has three degrees of freedom: flexion/extension, abduction/adduction, and inversion/eversion. Axial rotation of the lower leg that is not assigned to the lower-leg segment is represented by abduction/adduction of the foot segment. The graphical model also incorporates an articulated segment that represents the distal, middle, and proximal phalanges of each foot together. This element serves a graphical function only and is not considered in the biomechanical model or the analyses.