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Updated: Mar 27, 2026
Author Spotlight: Self-Assessment Protocol for Predicting Psoriatic Arthritis in Psoriasis Patients
Published on: March 1, 2024
Novel Composite Radiographic Score for Longitudinal Observational Studies of Psoriatic Arthritis: A Proof-of-concept
William Tillett1, Gavin Shaddick2, Deepak Jadon2
1From the Royal National Hospital for Rheumatic Diseases; Department of Mathematics, University of Bath; Department of Pharmacy and Pharmacology, University of Bath; Department of Radiology, Royal United Hospital, Bath, UK.W. Tillett, BSc, MBChB, PhD, MRCP, Royal National Hospital for Rheumatic Diseases; G. Shaddick, MSc, PhD, Department of Mathematics, University of Bath; D. Jadon, MBBCh, MRCP, Royal National Hospital for Rheumatic Diseases; G. Robinson, MBBS, FRCR, Department of Radiology, Royal United Hospital; E. Korendowych, PhD, MRCP, Royal National Hospital for Rheumatic Diseases; N. McHugh, MB, ChB, MD, FRCP, Department of Pharmacy and Pharmacology, University of Bath. w.tillett@nhs.net.
Objective:
To devise a feasible composite radiographic score for use in observational studies of psoriatic arthritis (PsA).
Methods:
Radiographs from 50 patients with PsA were evaluated with the PsA-modified Sharp, Sharp/van der Heijde (SvdH), and Ratingen scores. Data reductions were made to devise a concise score.
Results:
The Reductive X-ray Score for Psoriatic Arthritis (ReXSPA) required the assessment of only 22 joints (117 points), including erosion, joint space narrowing, and osteoproliferation in the hands and feet. The ReXSPA accounted for 80% of change detected with the SvdH score.
Conclusion:
We report a proof-of-concept radiographic score for observational studies derived though data reduction.
