Spondyloarthritis & psoriatic arthritis

Axial psoriatic arthritis in patients not fulfilling the back pain entry features of the ASAS Classification Criteria for Axial Spondyloarthritis: findings from the ATTRACT Study

Rheumatology (Oxford)Published Cross-sectional study

Authors' conclusion

This study demonstrates that among psoriatic patients who experience late-onset or non-chronic back pain, thereby not fulfilling ASAS entry pain features, a considerable proportion may be affected by active axPsA.

Study context

Population
Patients with psoriasis and back pain (ATTRACT Study)
Participants
265 patients
Exposure
Non-ASAS back pain vs patients fulfilling both ASAS entry pain features
  • non-ASAS/BPn = 50
Outcome
Prevalence of axPsA in patients not meeting ASAS entry pain features

Main finding

As reported in the abstract

AxPsA confirmed

Observational data: associations, not effects.

Further findings

Non-ASAS/BP subtypes

Late-onset back pain (LoBP)
34/50 (68%)
Non-chronic back pain (NcBP)
16/50 (32%)

Characteristics vs ASAS/BP

Mean age higher and IBP prevalence lower in non-ASAS/BP
Clinical disease activity similar between the two groups

Inflammatory and post-inflammatory radiographic and/or MRI changes in axPsA

Similar proportion in non-ASAS/BP and ASAS/BP axPsA

Original publication

Axial psoriatic arthritis in patients not fulfilling the back pain entry features of the ASAS Classification Criteria for Axial Spondyloarthritis: findings from the ATTRACT Study. Rheumatology (Oxford). Published 19 May 2025. doi:10.1093/rheumatology/keaf251

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