Patent ID: 8540779

Claim:
A hip prosthesis kit comprising a unitary acetabular cup having a non-articulating surface for attachment to an acetabular socket in a pelvic bone and a concave surface located opposite to the non-articulating surface, the concave surface having an acetabular cup stem firmly affixed therein and projecting outwardly therefrom, an acetabular ball firmly affixed to the acetabular cup stem, the acetabular ball having a surface, the concave surface of the acetabular cup and the surface of the acetabular ball are spaced from one another, thereby defining a gap therebetween, a femoral implant for implantation in a medullary canal of a proximal end of a femur, a femoral cup firmly affixed to a proximal end of the femoral implant the femoral cup having a femoral cup stem projecting outwardly therefrom in a direction opposite a concave surface thereof, the femoral cup stem having a length, and the femoral implant having at its proximal end a recess sized to receive the femoral cup stem, the femoral cup being sized for articulation in the gap, such that the femoral cup concave surface is sized for articulation on the surface of the acetabular ball and a convex surface opposite the concave surface of the femoral cup sized for articulation on the concave surface of the acetabular cup, the gap being sized and configured to permit said articulation while constraining the femoral cup within the gap throughout an entire range of said articulation of the femoral cup as it articulates within the gap, thereby reducing the risk of dislocation, and one or more additional femoral cups having different stem lengths.