Patent ID: 7909876

Claim:
An intervertebral disc prosthesis comprising: a first plate including a first articulating surface; a second plate including a second articulating surface, wherein the second articulating surface is substantially spherical in shape; and a core positioned between the first plate and the second plate, the core including a first bearing surface engaging the first articulating surface and a second bearing surface engaging the second articulating surface, wherein the first plate is configured to rotate relative to the core in a flexion plane, a lateral bending plane, and a torsional plane, and the second plate is restricted from rotating relative to the core in at least the flexion plane and the lateral bending plane, wherein the core comprises a disc portion and a radial flange, the radial flange includes a first portion that extends away from the disc portion and a second portion that contacts the second plate when the second plate is in a neutral position, wherein a collar is formed on the second plate about the second articulating surface, and the radial flange of the core encompasses the collar of the second plate, and wherein (i) the collar defines a groove, (ii) the second portion of the radial flange includes an inwardly facing projection, and (iii) the inwardly facing projection is received within the groove in a snap fit manner so as to secure the core to the second plate.