In diagnosis of patients with postoperative recurrence of back pain evaluation becomes much more difficult since postoperative scarring distorts the myelogram and the operative trauma may cloud the significance of electromyographic abnormalities, especially in the paraspinal musculature. It is important to evaluate these patients who have no evidence of motor root involvement but continue to complain of apin and are related to medico-legal problems from traffic accidents.

This paper discusses the usefulness of somatosensory evoked potentials(SEP) study in diagnosis of sensory radiculopathy developing after laminectomy.