[[Clinical and experimental study on the genesis of lumbar spinal stenosis (author's transl)].

In recent years, the entity of lumbar spinal stenosis has been generally accepted. It's pathogenesis is thought to be the results of developmental stenosis of the lumbar spinal canal. In this paper, some factors that can produce this developmental stenosis were investigated. There were positive correlations between the degree of lumbar lordosis by using indices of Ferguson's angle and width of the lumbar spinal canal based on the Jones' body to canal ratio and body to pedicle ratio in 130 children when examined by radiograms. Experimentally induced bipedal rats are known to have the burden to develop the lordosis in the lumbar spine. They had narrower spinal canal than the quadripedal rats according to the radiograms and indices described above. These data strongly suggest that those with severe lordosis or bipedal rats have more burden to the posterior part of the lumbar vertebrae, followed by it's unusual growth leading to narrower spinal canal posteriorly.