Reliability assessment of the OMERACT whole-body magnetic resonance imaging scoring system for juvenile idiopathic arthritis

Semin Arthritis Rheum. 2024 Jun:66:152437. doi: 10.1016/j.semarthrit.2024.152437. Epub 2024 Mar 16.


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.

Keywords: Children; Cno; Juvenile idiopathic arthritis; Omeract; Reliability; Scoring system; Whole body mri.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Arthritis, Juvenile* / diagnostic imaging
  • Child
  • Child, Preschool
  • Female
  • Humans
  • Joints / diagnostic imaging
  • Magnetic Resonance Imaging* / methods
  • Male
  • Reproducibility of Results
  • Severity of Illness Index
  • Whole Body Imaging* / methods