Abstract: Three axis movement emulating the action of a natural hip joint is provided by a universal assembly mounted on movable roller bearings in a horizontal swivel. A stem attached to the universal assembly is adapted to be implanted in the femur of the user. The horizontal swivel is mounted on roller bearings in a spherical housing which is adapted to be inserted in the acetabulum of the user.

Abstract: An artificial knee joint is provided in which a femoral component, a tibial component and a patella component simulate all the movements of a natural knee utilizing movable bearings between such components and elements thereof. In addition, a portion of the joint for flexion and extension may be repaired without involving major reconstructive surgery.

Abstract: A roller bearing knee replacement joint is provided in which a femoral component attached to the surgically prepared distal femur is positioned for articulation on a tibial component, which simulates the articulating surface of the natural tibia. The articulating surface has replaceable roller bearing units which provide the contact with the femoral component. A bearing mounting member has spaced bearing unit receptacles which are adapted to receive the bearing units laterally and permit the lateral removable therefrom. The roller bearing units reduce friction between the components and may be replaced with less extensive surgical procedures than in other replacement procedures. A patella component has a patella button which rides in a central concave groove in the femoral component and is mounted on radial roller bearings to provide rotational movement for the patella button to emulate the motion of a natural patella.