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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 24½ 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.
Cohen et al. (Sat,) studied this question.