[Myelography, computerized tomography and electromyography in intervertebral disk diseases of the lumbar spine].

Fifty-five patients who underwent lower spine surgery were preoperatively evaluated with myelography and postmyelography CT. ENMG was done on 23 patients. CT had the highest accuracy in finding the affected level (F = 75,5; p less than 0,0005) as compared to myelography (F = 46,5; p less than 0,0005) or to ENMG (F = 11,4; p greater than 0,15). We did not find statistical differences in diagnostic accuracy in different disc spaces nor was there a difference between primary and recurrent low-back disease.