Patent ID: 7169185

Claim:
A canine acetabular cup system, comprising: a. a plurality of different sized acetabular cups for selection by a surgeon, said acetabular cups being adapted for use with a common-sized femoral head; b. each said acetabular cups being provided with a truncated cutout on one side thereof for improved abduction and canine hip movement; c. said acetabular cup adapted to be held in place within a reamed spherical bone cavity by controlled interference between a multiple curvature Titanium-Aluminum-Vanadium shell of said acetabular cup and the bone cavity, providing for frictional attachment of the canine acetabular cup and imparting initial stability to the implant immediately after surgery; d. said shell having a porous coating of chemically pure Titanium beads sintered between circumferential rings on the outer surface of said shell, to increase friction at contact surfaces with the reamed bone cavity, promote bone growth and provide for long term stability of the implant; e. said shell having an ultra high molecular weight polyethylene insert attached within the shell by an interference fit, having locking features that prevent rotational, horizontal and vertical displacements of the said polyethylene insert with respect to the said shell; f. said locking feature comprising a non-cylindrical opening at an apex of said shell to receive and mate with a corresponding non-circular post at the apex of said polyethylene insert thereby preventing relative rotation of said polyethylene insert with respect to said shell; g. said locking feature comprising a groove in said polyethylene insert that mates with a corresponding interior projection of said shell, thereby preventing horizontal and vertical movement; h. said polyethylene insert having a spherical opening to receive said common-sized femoral head; and i. said polyethylene insert having a lip covering the basal surface of said shell, preventing contact between said common-sized femoral head and said shell.