The ornamental design for a spinaldistractionstructure, as shown and described.
FIG. 1 is an overhead isometric view of the front, top, and side of a spinal distraction structure showing our new design;
FIG. 2 is a top view thereof;
FIG. 3 is a side view, with the opposite side being a mirror image thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear thereof;
FIG. 6 is an overhead isometric view of the front, top, and side of a second embodiment of a spinal distraction structure, in which the height and length are of indeterminate dimensions;
FIG. 7 is a top view thereof;
FIG. 8 is a side view, with the opposite side being a mirror image thereof;
FIG. 9 is a front view thereof; and,
FIG. 10 is a rear view thereof.
The broken lines shown are for illustrative purposes only and form no part of the claimed design.