A prosthetic device for insertion into an intervertebral space is provided. The prosthetic device includes a first component having a first recess formed therein, the first recess defining a substantially concave recess surface of the first component, a second component having a second recess formed therein, the second recess defining a substantially planar recess surface, and a projection member adapted to engage the second recess surface wherein the projection member is also adapted to engage the first recess surface to permit articulating motion between the first and second components.
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