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The purpose of this paper is to evaluate roentgenologic changes of ankylosing ing hyperostosis of the spine(AH)and speculate the factors developing AH. In this report,22 patients with spinal injury were studied. All patients were males. The mean age of these patient at the final follow-up was 58 years with a range from 34 to 79 years. The patients were divided into two groups;one group of ossification of the anterior longitudinal ligament of the spine(OALL)and the other of non-ossification of the anterior longitudinal ligament of the spine(non-GALL). Each group was composed of ll patients. There was no difference in the background between two groups. Roentgenologic changes were evaluated by comparing two groups with regard to three points;the height of intervertebral discs, the degree of kyphosis and lordosis, and the degree of spodylolisthesis. The main results found in this long term follow-up study were as follows 1)In the cervical spine, GALL group has narrowing of the intervertebral discs more commonly than non-OALL group. 2)In the thoracic and lumbar spines, non-OALL group has more narrowing of the iritervertebral discs than OALL group. 3)OALL group has tendency to increase the degree of thoracic kyphosis and decrease that of lumbar lordosis. 4)There is no significant difference in the degree of spondylolisthesis between two groups. According to these results, we think that the important factor in the development of AH is not only diffuse ossifying diathesis but the local biomechanical factor.

Roentgenologic study of ankylosing hyperostosis in spinal cord injured patients.