Vertebra for an Articulation Device

FIG. 1 is a perspective view of our new design; FIG. 2 is a bottom perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a back view thereof; FIG. 5 is a right side view thereof; FIG. 6 is a left side view thereof; FIG. 7 is a top view thereof; and, FIG. 8 is a bottom view thereof. Any unshaded surfaces shown in broken lines or between solid and broken lines form no part of the claimed design. The broken lines in the drawings depict portions of the vertebra for an articulation device that form no part of the claimed design.