Patent ID: 8313531

Claim:
A reverse hip prosthesis comprising a unitary acetabular cup having a convex non-articulating surface for attachment to an acetabular socket in a pelvic bone and a concave surface located opposite to the convex 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, and a femoral cup firmly affixed to a proximal end of the femoral implant, the femoral cup sized for articulation in the gap, such that the femoral cup has a concave surface 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 articulations while constraining the femoral cup within the gap throughout an entire range of said articulations of the femoral cup as it articulates within the gap, thereby reducing the risk of dislocation.