It is anticipated that a total of 75 individuals will be studied. Subjects will be recruited from the Spine Clinic at Duke and overseen by Dr. Lad, respectively. Subjects will participate on a volunteer basis with informed consent approved by the Institutional Review Board of Duke University Medical Center. Apart from medically refractory chronic neuropathic pain, these individuals will be in good health. . The age range will be 18 years or older.