The Radiographic Diagnosis of Sacroiliitis

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Abstract
Conventional radiography is the standard method of objectively identifying sacroiliitis. Single views of the sacroiliac joints can be unequivocally interpreted in 70‐80% of patients with low back pain. A series of views usually correctly resolves the ambiguity in the remaining 20—30% of patients (67% correct). Computed tomography will be helpful in the few patients in whom a series of views produces equivocal interpretation.