O105 / #1056 WHERE IS THE DORSAL ROOT GANGLION HIDING? AN INTERNATIONAL CROSS-SECTIONAL ELECTRO-ANATOMICAL STUDY BASED ON NEURO-FIBER-MAPPING AND 3D-COMPUTERIZED PARESTHESIA-BASED QUANTITATIVE ASSESSMENT

Dorsal Root Ganglion (DRG) stimulation appears to be efficient to relieve pain (1,2) and more selective on the nervous system (3,4). In addition, the lack of cerebral spinal fluid between the DRG and the stimulation lead makes DRG stimulation require lower current (5). In order to achieve these benefits of DRG stimulation, the lead needs to be in direct contact with the DRG. There is currently no clear way of precisely locating the DRG. This study aims to map the DRG using the stimulation amplitude variations intraspinally, through the foramen and extraforaminally.