Diagnostic accuracy of inflammatory back pain for axial spondyloarthritis in rheumatological care

Objective Inflammatory back pain (IBP), the key symptom of axial spondyloarthritis (axSpA), including ankylosing spondylitis, has been proposed as a screening test for patients presenting with chronic back pain in primary care. The diagnostic accuracy of IBP in the rheumatology setting is unknown. Methods Six rheumatology centres, representing secondary and tertiary rheumatology care, included routinely referred patients with consecutive...