Patients were included between 2005 and 2013 when they suffered from chronic intractable pain and reported high levels of pain (VAS > 5, measured three times daily during four days) and when the chronic neuropathic pain had showed to be intractable. Furthermore, on radiographic imaging techniques performed less than three years before inclusion for the implantation of MCS should show a possible conflict that might contribute to the pain. A multidisciplinary approach by the anesthesiologist-pain specialists, neurosurgeons, and clinical psychologists was chosen for the selection of patients.