THE "NORMAL" SACROILIAC JOINT

ANALYSIS OF 88 SACROILIAC ROENTGENOGRAMS

¹ Associate Professor of Medicine, Boston University School of Medicine; Director, Arthritis and Connective Tissue Disease Section, University Hospital, Boston, Massachusetts
² Associate Radiologist, Harvard Medical School, Department of Radiology, Massachusetts General Hospital, Boston, Massachussets
³ Professor and Head, Department of Medicine, State University of New York at Buffalo; Chief of Medicine, E. J. Meyer Memorial Hospital
⁴ Professor of Medicine, Baylor University College of Medicine; Chief, Section on Rheumatic Diseases, Texas Medical Center, Houston, Texas
⁵ Associate Professor of Medicine, University of Maryland School of Medicine; Chief, Arthritis Section, University Hospital, Baltimore, Maryland

As a control for a study of sacroiliac changes in rheumatoid arthritis, a series of 94 roentgenograms of the abdomen and pelvis were reviewed. Six were eliminated from analysis because of known rheumatic disease discovered on review of the record.

Approximately 6 per cent of the individuals under age 50, and 24 per cent of individuals over age 50 had condensation, erosion, or both, in the region of the sacroiliac joint. The incidence was higher among males. Possible explanations for these findings are discussed and the importance of evaluating sacroiliac roentgenograms in relation to control series is emphasized.

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