- Patients who have spinal cord injury, multiple stimulator revisions, DRG stimulators, intrathecal pain pumps, complex regional pain syndrome, previous spinal cord stimulator implant, mechanical instability requiring fusion, myelopathy, psychological condition precluding them from complying with therapy, illegal drug abuse including heroin, cocaine, and illegally obtained prescription pills, or have previously been or are currently involved in litigation for medical malpractice.