The range of normal values of the spinal canal index of 180 normal Korean adults was measured in cervical and lumbar region.
The purpose of this study was to establish the range of normal values of anteroposterior spinal canal index and lateral spinal canal index in cervical and lumbar region in the interest of facilitating clinical investigation of spinal canal stenosis.
The anteroposterior spinal canal index was obtained by measurement of the ratio of the interpedicular distance to the transverse diameter of the vertebral body, and lateral spinal canal index was obtained by measurement of the ratio of the sagittal diameter of the spinal canal to the anteroposterior diameter of the vertebral body.
The results were the followings:
1. The lateral cervical spinal canal index from third to seventh cervical vertebra in male were 1.15±0.15 (mean±standard deviation), 1.16±0.17, 1.12±0.16, i.14±0.16, 1.15±0.12 respectively, and in female were 1.10±0.12, 1.11±0.13, i.08-±0.14, 1.08±0.13,1.11±0.11 respectively. In male and female combined, those were 1.13±0.14,´1.14±0.16,1.10±010, 1.12±0.15, 1.13±0.12 respectively. The mean of lateral cervical spinal canal index in male were larger than in female, and smallest in fifth cervical vertebra.
2. The anteroposterior lumbar spinal canal index from first to fifth lumbar vergebra in male were 1.81±0.16, 1.84±0.16, 1.87±_0.15; 1.90±0.17,1.83±0.17 respectively, and in female were 1.66±0.13, 1.71±0.14, 1.76±0.16, 1.79±014, 1.78±0.14 respectively. In male and female combined, those were 1.74±0.16, 1.78±0:16, 1.82±0.16, 1.85±0.16, 1.81±0.16 respectively. The mean of anteroposterior lumbar spinal canal index in male were larger than in female, and larger in´ lower lumbar region than in upper lumbar region relatively.
3. The lateral lumbar spinal canal index from first to .fifth lumbar vertebra in male were 1.77±0.16, 1.78±0.17, 1.84±0.17, 1.90±0.15, 1.96±0.20 respectively, and in female were 1.72±018,1.72±0.16,1.77±0.13, 1.86±0.16, 1.95±0.18 respectively.. In male and female combined, those were 1.75±0.17, 1.75±0.17, 1.81±016, 1.88±0.15, 1.96±0.19 respectively. The mean of lateral lumbar spinal canal index in male were larger than in female, and larger in lower lumbar region than in upper lumbar region relatively. The lumbar canal to body ratio were obtained by multiplication of anteroposterior spinal canal index by multiplication of anteroposterior spinal canal index by lateral spinal canal index. Compared with the measurements of Jones and Thoson, Lusted and Keats, Kang, et al., there was no apperent difference in the mean and distribution pattern between the orientals and the westerners.
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