The ornamental design for an articulating structure for protecting the spine, substantially as shown and described.
FIG. 1 is a perspective view of the articulating structure for protecting the spine according to the present invention;
FIG. 2 is a plan view of the articulating structure for protecting the spine according to the present invention as it would face the spine of the user; and,
FIG. 3 is a left side view of the articulating structure for protecting the spine according to the present invention, the right side view being the mirror image thereof.
The broken lines in FIGS. 1 and 3 of the articulating structure for protecting the spine are for illustration purposes only and form no part of the claimed design.