Subjects will be assessed for adverse events including pain and infection, motor function, and quality of life. Additional assessments will be made to measure any postoperative changes from baseline in neurologic deficits, imaging studies, bladder or bowel function, allodynia, and neuropathic pain (see schedule of activities). Subjects will also undergo serial assessments of respiratory function (vital capacity (VC) and negative inspiratory force (NIF)), motor function (Ashworth Spasticity Scale, hand-held dynamometry and electrical impedance myography (EIM)), and respiratory function (diaphragm ultrasound). All subjects will undergo cardiac autonomic function testing at Day -14 to Day -2 pre-operatively, and at 1 and 3 months post-operatively to monitor for potential cardiac autonomic neuropathy.