PT  - JOURNAL ARTICLE
AU  - Gina Hetland Brinkmann
AU  - Ellen S Norli
AU  - Pernille Bøyesen
AU  - Désirée van der Heijde
AU  - Lars Grøvle
AU  - Anne J Haugen
AU  - Halvor Nygaard
AU  - Olav Bjørneboe
AU  - Cathrine Thunem
AU  - Tore K Kvien
AU  - Maria D Mjaavatten
AU  - Elisabeth Lie
TI  - Role of erosions typical of rheumatoid arthritis in the 2010 ACR/EULAR rheumatoid arthritis classification criteria: results from a very early arthritis cohort
AID  - 10.1136/annrheumdis-2017-211350
DP  - 2017 Nov 01
TA  - Annals of the Rheumatic Diseases
PG  - 1911--1914
VI  - 76
IP  - 11
4099  - http://ard.bmj.com/content/76/11/1911.short
4100  - http://ard.bmj.com/content/76/11/1911.full
SO  - Ann Rheum Dis2017 Nov 01; 76
AB  - Objective To determine how the European League Against Rheumatism (EULAR) definition of erosive disease (erosion criterion) contributes to the number of patients classified as rheumatoid arthritis (RA) according to the 2010 American College of Rheumatology/EULAR RA classification criteria (2010 RA criteria) in an early arthritis cohort.Methods Patients from the observational study Norwegian Very Early Arthritis Clinic with joint swelling ≤16 weeks, a clinical diagnosis of RA or undifferentiated arthritis, and radiographs of hands and feet were included. Erosive disease was defined according to the EULAR definition accompanying the 2010 RA criteria. We calculated the additional number of patients being classified as RA based on the erosion criteria at baseline and during follow-up.Results Of the 289 included patients, 120 (41.5%) fulfilled the 2010 RA criteria, whereas 15 (5.2%) fulfilled only the erosion criterion at baseline. 118 patients had radiographic follow-up at 2 years, of whom 6.8% fulfilled the 2010 RA criteria and only one patient fulfilled solely the erosion criterion during follow-up.Conclusion Few patients with early arthritis were classified as RA based on solely the erosion criteria, and of those who did almost all did so at baseline.