Spinal segmental somatosensory evoked potentials in lumbosacral radiculopathies

Masud Seyal, L. S. Sandhu, Y. P. Mack

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


We studied 21 patients with lumbosacral radiculopathy with segmental somatosensory evoked potentials (SEPs) recorded over both spine and scalp following saphenous, superficial peroneal, and sural nerve stimulation. Spinal SEPs were abnormal in 10 patients. In 3 patients, SEPs detected abnormalities not seen on EMG examination. With 1 exception, all anatomic levels of SEP abnormalities matched that of radiographic, EMG, or clinical abnormalities. SEPs were abnormal in 41% of nerve roots shown to be involved by other techniques. SEPs added to the clinical evaluation in 4 patients, but were less accurate than a combination of EMG and radiography in indicating the extent of nerve root involvement. We conclude that spinal SEPs following segmental sensory stimulation are useful in the evaluation of lumbosacral radiculopathies and complement information provided by the EMG. In contrast, scalp-recorded segmental SEPs rarely provide additional useful clinical information.

Original languageEnglish (US)
Pages (from-to)801-805
Number of pages5
Issue number6
StatePublished - 1989

ASJC Scopus subject areas

  • Neuroscience(all)


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