In twenty-one patients with lumbar disc herniation, myelography, CTM and magnetic resonance imaging (MRI) were examined to determine the positional relation between the herniated disc and the nerve root. The location of the herniated disc was classifed into five types according to classification described by Tsuji.
At present, we conclude that the combination of myelography and CTM is more useful than MRI to determine the positional relation between the herniated disc and the nerve root.
