Fig. 9.

The low dorsal column (DC) threshold observed is independent of mediolateral position of spinal cord stimulation (SCS). A: schematic of experimental paradigm. Nine DRs across T3–S2 spinal segments were recorded with a simultaneous recording of the L3 DC. Recruitment thresholds of both populations were assessed with medial and lateral SCS placement (T9/T10). B: thresholds of DRs rostral and caudal to the site SCS were greater, relative to the DC threshold (dotted line at y = 1; n = 4 animals). C: grouped samples from n = 4 animals (9 roots sampled each, 36 total samples for both medial and lateral placement) show that although lateral placement leads to a reduction in the relative DR threshold (*P < 0.05), both medial and lateral placement have higher thresholds than DC (dotted line at y = 1) for recruitment (#P < 0.0001, Friedman test with Dunn’s multiple comparisons). Bar charts display means and SD.