5. Surgical issues. In the past, typically, at some point during the surgery, tests were done on whether the patient's pain is reduced immediately upon stimulation. If not, then leads were never internalized. The Investigators believe that this protocol may have reduced success rates needlessly. Acute effects of electrode insertion may have been present that prevented immediate benefits of the stimulation. Also, the most benefits the Investigators postulate are due to long-term effects of the stimulation. So the efficacy of DBS for pain, including SCI pain, may have been greatly underestimated. The present study will include patients that do not show an acute benefit immediately after surgical electrode implantation.