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Arthritis
Volume 2013 (2013), Article ID 659487, 7 pages
http://dx.doi.org/10.1155/2013/659487
Clinical Study

Diagnosis and Progression of Sacroiliitis in Repeated Sacroiliac Joint Computed Tomography

1Center for Medical Imaging and Physiology, Skåne University Hospital, Lund University, 221 85 Lund, Sweden
2Department of Diagnostic Radiology, Sahlgrenska University Hospital, University of Gothenburg, 413 45 Gothenburg, Sweden
3Department of Diagnostic Radiology, Sahlgrenska University Hospital, University of Gothenburg, 431 30 Mölndal, Sweden

Received 30 June 2013; Accepted 31 July 2013

Academic Editor: Ruben Burgos-Vargas

Copyright © 2013 Mats Geijer et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.