Abstract: A knee orthosis in which the lateral and medial hinges are articulated asymmetrically. The medial hinge, having a first variable axis of rotation, has a first pair of parallel concentric shells in the shape of the segment of a sphere defining a first opening between them, fastened to the medial portion of the thigh cuff, and three rivets, forming a first equilateral triangle having a center coincident with the first variable axis of rotation, fastened to each shell. The medial hinge also has a first shell in the shape of a segment of a sphere designed to be inserted into the first opening, fastened to the medial portion of the shank cuff and three grooves to receive the three rivets.

Abstract: A prosthetic foot keel comprising: (a) a generally S-shaped unitary spatula, defining a main forefoot leg, a rear leg, and an intermediate leg integrally joining the forefoot and rear legs; and (b) a generally C-shape heel, defining a top heel plate, a bottom heel plate, and an intermediate heel plate transversely integrally interconnecting the top and bottom heel plates; wherein said top heel plate is fixedly anchored against the underface of the spatula rear leg. A generally open pocket is defined by the heel and by the spatula intermediate and rear legs. The pocket opens both rearwardly of the foot keel and laterally outwardly thereof on the side opposite the intermediate heel part. The shape of the open pocket is resiliently deformable responsively to the cyclical loads sustained by the spatula forefoot leg and bottom heel plate during the wearer's gait.