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Interspinous ligamentitis in patients with psoriatic arthritis

Jack Arnold1,2,3, Muthusamy Chandramohan2, Philip S Helliwell1,2,3

  • 1Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, UK.

Rheumatology (Oxford, England)
|February 2, 2026
PubMed
Summary

Posterior soft-tissue inflammation, specifically interspinous ligamentitis, is a key cause of inflammatory back pain in psoriatic arthritis (PsA). This finding may be missed in MRI reports focusing on sacroiliac joints and vertebral bodies.

Keywords:
axial spondyloarthritisinflammatory back painmagnetic resonance imagingpsoriatic arthritis

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