Intervertebral disc implants having offset center of rotation

Abstract

Intervertebral disc implants including artificial disc replacement implants are provided for insertion into a disc space between two adjacent vertebrae. The implant comprises a first component having an outer surface for engaging one of the adjacent vertebrae and a concave surface opposite the outer surface and a second component having an outer surface for engaging the other of the adjacent vertebrae and an inner surface opposite the outer surface. The second component has a posterior end and an anterior end and a midline axis extending through the second component equally distant between the anterior and posterior ends. The implant further comprises an articulating core member residing between the first and second components and comprising a semi-spherical protrusion with a convex surface in contact with the concave surface of the first component. The apex of the convex surface is posterior to the midline axis of the second component.

Dependencies are inferred from the claim text.