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Diagnosis and progression of sacroiliitis in repeated sacroiliac joint computed tomography.

Journal article
Authors Mats Geijer
Gro Gadeholt-Göthlin
Jan Göthlin
Published in Arthritis
Volume 2013
Pages 659487
ISSN 2090-1984
Publication year 2013
Published at Institute of Clinical Sciences, Department of Radiology
Pages 659487
Language en
Links dx.doi.org/10.1155/2013/659487
Subject categories Radiology, Orthopedics

Abstract

Objective. To assess the clinical utility of repeat sacroiliac joint computed tomography (CT) in sacroiliitis by assessing the proportion of patients changing from normal to pathologic at CT and to which degree there is progression of established sacroiliitis at repeat CT. Methods. In a retrospective analysis of 334 patients (median age 34 years) with symptoms suggestive of inflammatory back pain, CT had been performed twice, in 47 of these thrice, and in eight patients four times. The studies were scored as normal, equivocal, unilateral sacroiliitis, or bilateral sacroiliitis. Results. There was no change in 331 of 389 repeat examinations. Ten patients (3.0%) had progressed from normal or equivocal to unilateral or bilateral sacroiliitis. Of 43 cases with sacroiliitis on the first study, 36 (83.7%) progressed markedly. Two normal cases had changed to equivocal. Eight equivocal cases were classified as normal on the repeat study. In further two patients, only small changes within the scoring grade equivocal were detected. Conclusions. CT is a valuable examination for diagnosis of sacroiliitis, but a repeated examination detects only a few additional cases of sacroiliitis. Most cases with already established sacroiliitis showed progression of disease.

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