The relationship between lumbar vertebral disc height on plain radiography and disc degeneration evaluated with magnetic resonance imaging

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  • MOTOMURA Hiraku
    富山医科薬科大学医学部整形外科学教室〔〒930-0194 富山市杉谷2630〕 国民健康保険神岡町病院整形外科
  • 金森 昌彦
    富山医科薬科大学医学部整形外科学教室〔〒930-0194 富山市杉谷2630〕
  • 信清 正典
    国民健康保険神岡町病院整形外科

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  • 単純Ｘ線像における椎間板腔の高さとＭＲＩにおける椎間板変性との関係
  • タンジュン Xセンゾウ ニ オケル ツイカンバンコウ ノ タカサ ト MRI ニ オケル ツイカンバン ヘンセイ ト ノ カンケイ

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Abstract

The lumbar spines of 45 patients were examined by plain radiography and magnetic resonance imaging (MRI) to determine if there was a statistically significant correlation between disc height and degree of disc degeneration. Disc height was measured using three different methods: Method A; (a+b+c)/d, a; anterior disc height, b; middle disc height, c; posterior disc height, d; sagittal diameter of vertebral body. Method B; (a’+b’+c’)/d’, where a’, b’ and c’ were equivalent to a, b, c, in Method A, but which also included the osteophytes. Method C; S1/S2, where S1 and S2 (S1; disc area, S2; vertebral area) were analyzed by computer, and relative ratios were devised. Determination of disc degeneration at L3-4 and L4-5 were evaluated using Schneiderman’s criteria on MRI. Methods A and B correlated with the grade of disc degeneration on MRI. However, method C did not yield statistically significant correlation with MRI data As a conclusion, the disc height indices on plain radiography, as determined by Methods A and B above, are useful as indicators of disc degeneration. L3-4 disc ratios of 0.71 or less, L4-5 disc ratios 0.60 or less (method A), L3-4 disc ratios 0.64 or less, and L4-5 disc ratios of 0.60 or less (method B), when compared with Schneiderman’s classification of disc degeneration yielded a result of“marked”or“absent”. These indices/ratios determined by Methods A and B may be considered threshold values for determining disc degeneration when using plain radiography as opposed to MRI.

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