A systematic approach to the consensus definitions and reliability of ultrasound in idiopathic inflammatory myopathies; Preliminary data by the OMERACT ultrasound in myositis working group
Authors' conclusion
The systematic approach by the OMERACT US in the myositis subgroup has developed a categorical morphological scoring system, which showed moderate inter-rater reliability using consensus-derived definitions of US domains in IIM.
Study context
- Population
- International experts from the OMERACT US in myositis subgroup; elementary US lesions in idiopathic inflammatory myopathies (IIM)
- Participants
- 21 international experts
- Outcome
- Consensual definitions of elementary US lesions specific to IIM and their reliability
Methodological detailsmulticentre, multi-round Delphi survey, web-based reliability exercise
- Multicentre
- Multi-round Delphi survey
- Web-based reliability exercise
Recommendations
As reported in the abstract
Reliability of the categorical morphological grading system (single domain "muscle inflammation and damage")
Intra-rater reliability, kappa (substantial; min 0.051, max 1.000, SD 0.295)
0.706
Inter-rater reliability, kappa (improved moderate; min 0.421, max 1.000, SD 0.167)
0.506
Further findings
Reliability of preliminary broad domains "inflammation" and "damage"
- Intra-rater kappa, inflammation (substantial)
- 0.662
- Intra-rater kappa, damage (substantial)
- 0.620
- Inter-rater kappa, inflammation (poor)
- 0.142
- Inter-rater kappa, damage (poor)
- 0.112
Original publication
A systematic approach to the consensus definitions and reliability of ultrasound in idiopathic inflammatory myopathies; Preliminary data by the OMERACT ultrasound in myositis working group. Semin Arthritis Rheum. Published 19 April 2026. doi:10.
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