Estimation of Vertebral Rotation and the Spinal and Rib Cage Deformity in Scoliosis by Computer TomographyAARO, STIG, MD*; DAHLBORN, MATS, MD†Spine: September-October 1981 - Volume 6 - Issue 5 - p 460-467 Original Article: PDF Only Buy Abstract Author InformationAuthors Computer tomography (CT) presents a method of determining longitudinal axis vertebral rotation and vertebral, spinal, and rib cage deformity. Different rotation angles, distances, and indexes are defined and discussed. Radiation risks were evaluated and considered exceedingly small when compared to the ordinary spinal anteroposterior radiograph. In a model study the mean difference between actual vertebral rotation and measured rotation was 0.3º if the vertebrae were tilted up to 20º in either the frontal or sagittal plane. This accuracy was lost if the vertebrae were tilted 20º in both the frontal and the sagittal plane. Computer tomography can be used for evaluation of the vertebral rotation in the frontal plane. *From the Department of Orthopaedic Surgery, Huddinge University Hospital, Karolinska Institutet, Stockholm, Huddinge, Sweden †From the Department of Diagnostic Radiology, Huddinge University Hospital, Karolinska Institutet, Stockholm, Huddinge, Sweden © Lippincott-Raven Publishers.