Early axial spondyloarthritis diagnosis was linked to less spinal damage after 10 to 15 years

Design

Longitudinal registry analysis

Population

376 patients with axial spondyloarthritis (138 early, 238 established), mean follow-up 11.5 years

Primary outcome

Long-term radiographic progression (mSASSS)

Effect

-3.85 mSASSS units (95% CI -7.28 to -0.42); adjusted -5.70 (-9.31 to -2.09)

This Swiss registry analysis included 376 patients with axial spondyloarthritis who had at least two sets of spinal radiographs between 2004 and 2024. Early disease was defined as axial symptoms for two years or less (138 patients) and the rest as established (238). Two readers scored radiographs with the modified Stoke Ankylosing Spondylitis Spinal Score.

Baseline characteristics were similar. Mean follow-up was 11.5 years. Patients with early diagnosis had a lower long-term score (-3.85 units, 95% CI -7.28 to -0.42), a gap that appeared 10 to 15 years after diagnosis. After adjusting for baseline radiographic damage the difference was -5.70 units (95% CI -9.31 to -2.09).

This is observational registry work. Patients diagnosed early may differ in ways that were not captured, such as access to care or disease course, and the score gap is modest. It supports efforts to shorten diagnostic delay, but it does not prove that earlier treatment is responsible.

• Ask about inflammatory back pain in young adults with chronic back pain, and refer early.
• Do not wait for radiographic sacroiliitis; early disease may be visible only on MRI.
• Record symptom duration at diagnosis to audit diagnostic delay.
• Expect the benefit to show up over a decade, not within the first year or two.

Why it matters

Earlier studies found no short-term difference between early and established disease, and this suggests the payoff comes later.

Don't overread it

Registry associations cannot show that earlier diagnosis caused the difference in spinal damage.

The statistics, in plain English

The upper bound of the first interval (-0.42) is close to zero, so the unadjusted difference is only just distinguishable from none. The adjusted figure is firmer but still comes from observational data, where earlier-diagnosed patients may have been different from the start.

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