Abstract: A bicondylar joint prosthesis for articulating two portions of a natural or artificial limb including two pairs of co-acting male and female condylar components of artificial material, the male components consisting of male medial and lateral protruberances having substantially identical part-spherical articulating surfaces engageable with a respective complementary female medial and lateral condylar component, the lateral pair of condylar components being shaped to allow relative angular deflection of the two limb portions simultaneously about two axes, a first axis of the two axes lying in a medial-lateral plane of the prosthesis passing through a common mean center of relative rotation of the lateral components and a second axis of the two axes also passing through the common mean center and being substantially normal to the first axis while the medial condylar components are shaped to roll on each other about both axes, the rolling motion about the second axis producing angular deflection of the first axi

Abstract: A knee support is provided for opposing excessive or abnormal strain or torque on the joint. The support has a pair of pivotally interconnected rigid braces one of which snugly embraces the front of the thigh just above the patella and the other of which snugly embraces the front of the shin just below the patella. The pivots are aligned approximately on the mean medial-lateral axis of flexion of the knee and at least the pivot on the lateral side has freedom of universal pivotal motion while that on the medial side has limited freedom of relative bodily displacement in the anterior-posterior direction. Both freedoms are of sufficient magnitude to accommodate the wearer's normal degree of tibial rotation during flexion and extension. Means are provided for locating each brace firmly on its respective component of the limb.