Fig. 3

Beta-Prosthesis Knee Schematic. Schematic of the knee system showing the knee drive and carriage and the Weight Acceptance side. The connection to the carriage allows both flexion and extension torques to be created by adjusting the position of the carriage (KA _z ) while the WA side is unilaterally constrained allowing only extension torques to be created. The knee angle at which the WA is engaged is changed by varying WA _z