Abstract
Spondylolisthesis is one of the demonstrable causes of backache and lesions of the cauda equina. Since Neugebauer's1work in 1884, there has been no extensive study of the subject, although it has often been mentioned in the literature in connection with other conditions in the lumbosacral region. A few cases have been reported, and many conflicting theories regarding the etiology, based on one or two cases, have been advanced. It is my aim in this study to present the clinical knowledge obtained from a review of twenty-seven definite cases of spondylolisthesis. Spondylolisthesis has been recognized as a forward subluxation of the fifth, occasionally the fourth, lumbar vertebra, or the body alone of one of these vertebrae, since Killian demonstrated the first case in 1853. Early cases were recognized during the course of difficult labor. Neugebauer, who devoted practically his entire life to the study of spondylolisthesis, believed

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