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To the Editor: I was interested to read the paper by Christiansen, et al published in the January 2017 issue of The Journal of Rheumatology 1. The purpose of the authors was to determine the reproducibility of sacroiliac joint (SIJ) radiographs among readers with varying levels of experience, and to identify potential drivers of disagreement in classification among 5 predefined radiographic lesion types1. A hundred and four patients with low back pain ≥ 3 months who met the … Address correspondence to Dr. S. Sabour, Safety Promotion and Injury Prevention Research Center, Department of Clinical Epidemiology, Shahid Beheshti University of Medical Sciences, Tehran, I.R. Iran. E-mail: s.sabour{at}sbmu.ac.ir

Reliability of Radiographic Assessment of Sacroiliac Joints in Patients with Suspected Early Spondyloarthritis: Methodological Issue