Patent ID: 8808384

Claim:
An intervertebral disc comprising: a superior endplate having an upper vertebra contacting surface and a lower bearing surface, wherein the upper surface of the upper endplate has a domed central portion and wherein the lower bearing surface has a concavity disposed opposite the domed central portion; an inferior endplate having a lower vertebra contacting surface and an upper surface, wherein the lower surface of the lower endplate has a domed central portion and wherein the upper bearing surface has a concavity disposed opposite the domed central portion; a core positioned between the superior and inferior endplates, the core having upper and lower surfaces configured to mate with the bearing surfaces of the superior and inferior endplates; and wherein the domed central portion of the superior endplate has a height greater than a height of the domed central portion of the inferior endplate, wherein the central portion heights are measured from the periphery of the vertebra contacting surface, not including any serrations, teeth or fins, to the highest part of the domed central portion, not including any serrations, teeth or fins.