Patent ID: 8277507

Claim:
An artificial disc replacement comprising: a first component having a first articulating surface and a first vertebral contact surface for engaging a first vertebral body, the first vertebral contact surface including at least one projection for engaging the first vertebral body, and the first articulating surface including first and second lateral edges and a toroidal region extending between the first lateral edge and the second lateral edge; and a second component having a second articulating surface engaged with the first articulating surface and a second vertebral contact surface for engaging a second vertebral body, the second vertebral contact surface including at least one projection for engaging the second vertebral body, and the second articulating surface including third and fourth lateral edges and a toroidal region extending between the third lateral edge and the fourth lateral edge, wherein the toroidal region of the first and second articulating surfaces, respectively, are defined by continuous curves, wherein the first articulating surface is located in at least an anterior portion of the first component, and the second articulating surface is located in at least a posterior portion of the second component, and wherein the first articulating surface is defined by a concave arc having a radius of curvature A about a first axis, and a convex arc having a radius of curvature B about a second axis perpendicular to the first axis, and the second articulating surface is defined by a convex arc having a radius of curvature C about a third axis, and a concave arc having a radius of curvature D about a fourth axis perpendicular to the third axis.