The present disclosure relates to an intervertebral disc prostheses or implant, and more particularly to an intervertebral disc prosthesis that can be surgically introduced between adjacent vertebral bodies and adjusted or expanded in situ to occupy an optimal or desired space between the vertebral bodies. The implant is preferably inserted into the evacuated disc space obliquely and then oriented so as to extend laterally across the anterior adjacent vertebrae bodies occupying the disc space with the outer ends of the implant being supported by the cortical rims on the opposite sides of the vertebrae bodies. The outer convex surfaces of the two body members conform anatomically to the shape of the disc space contacting the endplates. The implant has two body members that are movable relative to one another so as to vary the space between the members. With the implant so positioned and oriented, the disc space and the implant may be then distracted and a spacer of a desired, predetermined thickness may be inserted within the space between the body members so as to maintain a desired amount of distraction. A method of using an implant is also disclosed.
