Spinal cord
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To describe an electrophysiological method for determining the relation between lumbar cord dorsal roots and cathode of epidural electrode for spinal cord stimulation (SCS). ⋯ pEMG recording of muscle twitches enables us to accurately differentiate between upper and lower lumbar cord segments. Furthermore, our findings regarding amplitude, latency and recruitment order strongly suggest that we stimulate posterior roots not posterior columns of the lumbar spinal cord.