A Late Effect on the Cervical Spine in Ankylosing Spondylitis

Abstract
Extensive re-sorption of bone from the anterior surface of the cervical spine is not uncommon in ankylosing spondylitis and is not to be confused with the growth disturbances seen in juvenile rheumatoid arthritis. Two examples of this deformity are illustrated. The radiological findings in one case clearly show that the onset occurred in adulthood, after the spine had reached full maturity. Furthermore, one may expect a generalized reduction in the size of the cervical vertebral bodies in juvenile rheumatoid arthritis, whereas in these adult cases the antero-posterior diameters are primarily affected.

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