Patent ID: 6923833

Claim:
A prosthetic constraining device for use with a hip replacement prosthesis that includes an acetabular cup assembly adapted to be bonded to a patient's pelvis and a femoral stem adapted to be bonded to the patient's femur, where the femoral stem includes a ball component at its proximal end received within the acetabular cup assembly to form a ball joint type coupling, the constraining device comprising: a ring having a central aperture, the ring being adapted to be mounted to a rim of the acetabular cup assembly so that the femoral stem passes through the central aperture, the diameter of the central aperture being less than the diameter of the ball component on the proximal end of the femoral stem so that the ring assists in maintaining the ball joint type coupling between the acetabular cup assembly and the femoral stem; the ring material comprises at least one of porcine small intestine submucosa (SIS), xenogeneic small intestine submucosa (xSIS), urinary bladder submucosa (UBS), laminated intestinal submucosa, and glutaraldehyde-treated bovine pericardium (GLBP).