Patent ID: 8721724

Claim:
A modular intervertebral implant having a central axis comprising: a first component selected from a first group of at least two first components with unequal heights wherein the first component has a first height H 1 , a first surface configured to abut an end plate of a first adjoining vertebral body, and a concave spherical articulation surface with a radius R; and a second component selected from a second group of at least two second components with unequal heights wherein the second component has a second height H 2 , a second surface configured to abut an end plate of a second adjoining vertebral body, and a convex spherical articulation surface with substantially the same radius R as the concave spherical articulation surface; wherein: the first component and the second component are connectable in a ball-joint like manner, and wherein the first component and the second component form a center of rotation RZ for said intervertebral implant which center of rotation RZ differs based on the second component selected; and wherein the center of rotation RZ has a shortest distance A to the second surface that is equal to the absolute difference between the height H 2 of the second component and the radius R of the second component selected; and wherein a maximum overall H of the intervertebral implant is less than H 1 +H 2 .