 After the training period has ended, patients will be followed by Drs BoakyeWilliams and Harkema every 3-6 months for a total of 3 years following surgery. After 3 years the patients will be followed up by Drs BoakyeWilliams and Harkema every six months for continued long-term care until the device is explanted or the device is approved for stepping and standing in spinal cord injury. Follow-up neurological examination for the purpose of this study will be incorporated into each clinic visit. The decision to continue to maintain the stimulators or remove them will be made during these follow-up visits. 