Functional Significance of a Biomimetic Hydraulic Ankle/Foot System

The Motion Foot is a new foot/ankle system that offers near-normal ankle range of motion via a hydraulic ankle (ROM = 50 deg), paired with an energy-storing foot plate. This system has been developed to offer to above-knee and below-knee prosthesis wearer: 1) improved comfort, 2) reducedloads on proximal joints and 3) improved stability. Improved comfort and reduced proximal joint loading is achieved through: 1) shock absorption at heel-strike by plantar flexion of rotary hydraulic spring/damper system, 2) smooth adjustable resistance to roll-over in mid-stance, 3) Higher toe clearance during swing phase that reduces uncomfortable and energy consuming hip elevation.