Early Axial Spondyloarthritis Diagnosis Associated With Less Long-Term Spinal Damage

A longitudinal analysis published in Arthritis & Rheumatology compared spinal radiographic progression in patients with early versus established axial spondyloarthritis (axSpA) receiving standard care in the Swiss Clinical Quality Management registry. Early axSpA was defined as two years or less of axial symptoms. The study included 376 patients with at least two sets of spinal radiographs collected between 2004 and 2024: 138 with early and 238 with established axSpA. Two readers assessed damage using the modified Stoke Ankylosing Spondylitis Spinal Score (mSASSS), with adjudication for disagreements.

Across 1,181 radiograph sets, mean follow-up was 11.5 years (SD 8.6). Baseline characteristics were similar between groups; 61% of patients were male and 69% were HLA-B27 positive. A nonlinear longitudinal model estimated lower long-term mSASSS in early axSpA than in established disease, with a difference of −3.85 units (95% CI −7.28 to −0.42). The difference became evident 10–15 years after diagnosis and remained statistically significant after adjustment for baseline radiographic damage: −5.70 units (95% CI −9.31 to −2.09).

The findings support an association between earlier diagnosis and less long-term structural damage. However, this observational comparison does not establish that earlier diagnosis itself prevents progression. Radiographic damage was the assessed outcome; effects on symptoms and function were not reported in the abstract. Full-text methods and additional adjustments were unavailable for assessment.