Anterolisthesis in the cervical spine--spondylolysis.

Two cases of cervical spondylolisthesis are reported, and the relevant English language literature is reviewed. Analysis of data derived from all of the cases reported revealed no statistically significant etiological or prognostic factors. The roentgenological evaluation, including associated anomalous findings, is presented. Etiological and clinical aspects of cervical spondylolisthesis are discussed. It is concluded that cervical spondylolysis is a relatively rare congenital defect. The role of manipulative therapy in the treatment of associated symptoms is discussed.