Conventional Radiology in Spondyloarthritis.

Spondyloarthritides are of a group of inflammatory rheumatic diseases, with negative rheumatoid factor, associated with the HLA-B27 gene. They comprise ankylosing spondylitis, psoriatic arthritis, reactive arthritis, and enteropathic-related spondylitis. The presence of sacroiliitis represents the most characteristic feature of these disorders and is an important criterion in diagnosis. Nonradiographic axial spondyloarthritis is a new classification concept. Conventional radiography is recommended as the first imaging method to diagnose sacroiliitis and different entities and to monitor established structural changes.