Abstract
Inter-reader reliability of a new scoring system for evaluating joint inflammation and enthesitis in whole body MRI (WBMRI) in juvenile idiopathic arthritis was tested. The scoring system grades 732 item-region combinations of bone marrow and soft tissue changes for commonly involved joints and entheseal sites. Five radiologists rated 17 WBMRI scans through an online rating platform. Item-wise reliability was calculated for 117 items with non-zero scores in >10 % of readings. Interquartile ranges of the five-reader Kappa reliability coefficients were 0.58–0.73 (range: 0.36–0.88) for the joints, 0.65–0.81 (range: 0.39–0.95) for the entheses, and 0.62–0.75 (range: 0.60–0.76) for chronic nonbacterial osteomyelitis-like lesions.
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