Comparison of patients with ankylosing spondylitis (AS) and non‐radiographic axial spondyloarthritis (nr‐axSpA) from a single rheumatology clinic in New Delhi

The differences brought out between AS and nr-axSpA groups show that they may not be the same disease. A prospective long-term follow-up of large cohorts may help in clarifying if nr-axSpA is simply an early stage in the spectrum of SpA evolving into AS over time or is there inherent difference between them.