A prosthetic or orthotic housing 100 comprising a cylinder 120 to receive a piston, a pump mounting section 140 to receive a pump, and fluid channels 153 connecting the pump and cylinder. The housing is formed of a unitary construction that may be produced by additive methods. The housing may have one or more apertures to receive valves, such as adjustable orifice or check valves, to control fluid flow through the channels. A switch such as a solenoid may be operably coupled to one or more fluid passages to switch the housing between first and second modes of operation. The pump may be a gear pump with two gears received in the housing and the rest of the pump mounted thereto. The prosthesis may be a powered ankle assembly with an attachment 132 for a foot component, or may be an orthosis such as a powered knee othosis.La présente invention concerne une prothèse qui comprend un boîtier (100) ； un piston (221) et une tige (222) de piston logés dans un cylindre du boîtier (100) ； et une pompe (244) montée sur le boîtier (100) et au moins en partie à l'intérieur de celui-ci. Le boîtier (100) consiste en une seule pièce et comprend une pluralité de passages (151, 152, 153, 154) reliant le cylindre à la partie du boîtier (100) sur laquelle est montée la pompe (244).
