Anterior extension of the thoracic vertebral bodies in Scheuermann's kyphosis. An anatomic study.

Changes consistent with Scheuermann's kyphosis were noted in 103 specimens (7.4%) of a sample of 1,384 thoracic spines in the Hamann-Todd collection of human skeletons. In 94% of the affected vertebrae, a distinct anterior elongation of the vertebral centrum was present. This anterior extension was composed of mature cancellous bone and was morphologically and roentgenographically different from marginal osteophyte formation. It was not present in any vertebrae of a control group of 50 unaffected spines. Associated findings included vertebral wedging and Schmorl's nodes.