The ornamental design for an intervertebralcage, as shown and described.
FIG. 1 is a top view of an intervertebral cage, showing my new design;
FIG. 2 is another top view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is another front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is another rear view thereof;
FIG. 7 is a side view thereof;
FIG. 8 is another side view thereof;
FIG. 9 is an isometric view thereof; and,
FIG. 10 is another isometric view thereof.
The broken line showing of human vertebrae is directed to environment and is for illustrative purposes only; the broken lines form no part of the claimed design.