Patent ID: 8764833

Claim:
An intervertebral disc comprising: an upper plate having an upper vertebra contacting surface and a lower bearing surface, wherein the upper vertebra contacting surface of the upper plate comprises a vertebral contacting surface formed in a first plane, a convex central portion extending upward from the first plane and at least one anchoring element extending upward beyond an upper surface of the convex central portion, and wherein the lower bearing surface has a concavity disposed opposite the convex central portion; a lower plate having a lower vertebra contacting surface and an upper surface; and wherein the lower vertebra contacting surface of the lower plate comprises a vertebral contacting surface formed in a second plane and a convex central portion extending downward from the second plane, and wherein the upper bearing surface has a concavity disposed opposite the convex central portion; a core positioned between the upper and lower plates, the core having upper and lower convex surfaces configured to mate with the bearing surfaces of the upper and lower plates; and a plurality of teeth provided on the upper surface of the upper plate and the lower surface of the lower plate, wherein the teeth having a posterior facing surface formed at an angle of less than 40 degrees with respect to the vertebra contacting surfaces and an anterior facing surface formed at an angle of more than 50 degrees with respect to the vertebra contacting surfaces.