Rentgenological Investigations of Redundant Nerve Roots

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Roentgenological investigations have been performed on 135 cases with redundant nerve roots (RNR) of 652 cases myelography had been done.In these cases, 271 lumbar canal stenosis (LCS), 13 spondylolisthesis, 337 lumbar disc lesion (LDL), 1 abnormal caudal sac (ACS) and 23 normal (N) patients were included. These studies consisted of (1) incidence of RNR from classifications of diseases, types (undulant type, sepentine type, loop type), age group (LCS) and level (LCS) and (2) correlation between RNR and lumbar motion, RNR and lumbar total disc index (TDI).Results were as follows:1) RNR was encountered in 21%. (LCS: 119/271, LDL: 14/337, ACS: 1/1, N: 1/23). In LCS, it was found in 44%.2) Incidence from types was undulant type (54%), serpentine type (31%), loop type (15%). In degenerative spondylolisthesis, loop type accounted for 38%.3) RNR tended to increase with aging and 70% was encountered from 50 to 64 yrs of age. Besides, redundant nerve tended to be more severe with aging.4) The main location of redundant nerve was 2nd lumbar vertebra, but in 24%, they were found from 4th lumbar vertebra to L5/S segment.5) In the cases with LCS or instability due to disc degeneration, correlation with RNR was encountered with high frequency.
西日本整形・災害外科学会の論文