RT Journal Article SR Electronic T1 Identification of the Clinical Features Distinguishing Psoriatic Arthritis and Fibromyalgia JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP jrheum.110893 DO 10.3899/jrheum.110893 A1 Antonio Marchesoni A1 Fabiola Atzeni A1 Antonio Spadaro A1 Ennio Lubrano A1 Giuseppe Provenzano A1 Alberto Cauli A1 Ignazio Olivieri A1 Daniela Melchiorre A1 Carlo Salvarani A1 Raffaele Scarpa A1 Piercarlo Sarzi-Puttini A1 Monica Montepaone A1 Giovanni Porru A1 Salvatore D'Angelo A1 Mariagrazia Catanoso A1 Luisa Costa A1 Maria Manara A1 Valentina Varisco A1 Laura Rotunno A1 Orazio De Lucia A1 Gabriele De Marco YR 2012 UL http://www.jrheum.org/content/early/2012/01/12/jrheum.110893.abstract AB Objective To identify the clinical features that can help to distinguish between psoriatic arthritis (PsA) and fibromyalgia (FM). Methods Our cross-sectional study was carried out in 10 Italian rheumatology centers between January and September 2009, and enrolled all consecutive patients with PsA and FM who agreed to participate. Standard clinical and laboratory data for PsA and FM were collected from all patients. Records were made of somatic symptoms, response to nonsteroidal antiinflammatory drugs (NSAID), self-evaluated pain, general health, disability, and responses to the Fibromyalgia Impact Questionnaire. Data were statistically analyzed by univariate and multivariate analyses, and receiver-operating characteristic curves. The analysis concentrated on the clinical features shared by the 2 conditions. Results Two hundred sixty-six patients with PsA (mean age 51.7 yrs; disease duration 10.2 yrs) and 120 patients with FM (mean age 50.2 yrs; disease duration 5.6 yrs) were evaluated. Univariate analysis showed that patients with FM had higher mean tender point and enthesitis scores, more somatic symptoms, and responded less to NSAID. Multivariate analysis showed that the presence of ≥ 6 FM-associated symptoms and ≥ 8 tender points was the best predictor of FM. Conclusion The shared clinical features of PsA and FM that had the greatest discriminating power for FM were the number of FM-associated symptoms and tender point count.