Hydraulic/pneumatic external ankle-foot prosthesis

Hydraulic/pneumatic external ankle-foot prostheses are advanced lower-limb devices designed to replicate the natural movement of a missing foot and ankle. They use fluid-based systems (hydraulics or pneumatics) to simulate the resistance and flexibility of a biological ankle, enabling smoother transitions during walking, running, or other activities by adjusting damping progressively over multiple steps.

These devices are typically regulated as complex prosthetics, often requiring compliance with biomechanical and safety standards. They may be supplied as standalone components or as part of a full prosthetic system, with variations in design to accommodate different user needs and activities—such as adjustable heel heights or integrated carbon fiber blades.