... sclerosis, multiple sclerosis,and severe peripheral neuropathy.Somatosensory-evoked poten-tials and motor-evoked potentialsare of limited utility during thediagnostic evaluation but are usedintraoperatively. ... severechanges in latency and amplitude.Some authors advocate the use ofintraoperative spinal-cord evokedpotentials to identify the level ofgreatest conduction delay and thenlimit surgery to that level17; ... degree of difficulty of the proce-dure, the risk of postoperative graftcomplications, and the potential forsoft-tissue complications increasewith the number of corpectomy lev-els. This limitation...