Patent ID: 8702797

Claim:
An intervertebral implant, comprising: an upper portion that is made from a first x-ray transparent material and comprises: a first part having an upper apposition surface to contact a base plate of a vertebra lying above the upper apposition surface, and a separate second part having a concave sliding portion, the second part coupled to the first part; a lower portion that is made from the first x-ray transparent material and comprises: a first part having a lower apposition surface to contact a cover plate of a vertebra lying below the lower apposition surface, and a separate second part having a convex sliding portion; wherein the convex sliding portion and the concave sliding portion form a joint through which the upper portion and the lower portion are rotatable relative to each other, wherein the second part of the upper portion is permanently coupled with the first part of the upper portion and the second part of the lower portion permanently coupled with the first part of the lower portion, wherein the upper portion is permanently connected with the lower portion at a pin movably coupled with the lower portion and fixedly connected with the upper portion such that the pin extends through the second part of the upper portion and is fixedly connected to the first part of the upper portion; and wherein the second part of the upper portion including the concave sliding portion is made from a second x-ray transparent material that is different from the first x-ray transparent material.