TY - JOUR T1 - Novel Composite Radiographic Score for Longitudinal Observational Studies of Psoriatic Arthritis: A Proof-of-concept Study JF - The Journal of Rheumatology JO - J Rheumatol SP - 367 LP - 370 DO - 10.3899/jrheum.150114 VL - 43 IS - 2 AU - William Tillett AU - Gavin Shaddick AU - Deepak Jadon AU - Graham Robinson AU - Eleanor Korendowych AU - Neil McHugh Y1 - 2016/02/01 UR - http://www.jrheum.org/content/43/2/367.abstract N2 - 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 (234 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. ER -