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  • Title: Development and reliability of a novel ultrasonographic joint-specific scoring system for synovitis with reference atlas for patients with juvenile idiopathic arthritis.
    Author: Sande NK, Bøyesen P, Aga AB, Hammer HB, Flatø B, Roth J, Lilleby V.
    Journal: RMD Open; 2021 Apr; 7(2):. PubMed ID: 33883255.
    Abstract:
    OBJECTIVE: To develop an ultrasonographic image acquisition protocol and a joint-specific scoring system for synovitis with reference atlas in patients with juvenile idiopathic arthritis (JIA) and to assess the reliability of the system. METHODS: Seven rheumatologists with extensive ultrasound experience developed a scanning protocol and a semiquantitative joint-specific scoring system for B-mode (BM) synovitis for the elbow, wrist, metacarpophalangeal 2-3, proximal interphalangeal 2-3, hip, knee, ankle and metatarsophalangeal 2-3 joints. An ultrasonographic reference atlas for BM synovitis, divided in four age groups (2-4, 5-8, 9-12, 13-18 years), and power Doppler (PD) activity was then developed. Reliability was assessed for all joints on still images and in a live exercise including 10 patients with JIA, calculated by intraclass correlation coefficient (ICC) and weighted kappa. RESULTS: A scanning protocol and scoring system for multiple joints with reference atlas composed of images with four different score levels for BM and PD were developed. Still image scoring for BM synovitis on joint level showed good to excellent intra-reader reliability (ICC/kappa ranges: 0.75-0.95/0.63-0.91) and moderate to excellent inter-reader reliability (ICC/kappa ranges: 0.89-0.99/0.50-0.91). Still image scoring for PD activity showed excellent intra-reader and inter-reader reliability (ICC/kappa: 0.96/0.91 and ICC/kappa: 0.97/0.80, respectively). In the live scoring, inter-reader reliability (ICC/kappa) was moderate to excellent for BM synovitis (0.94/0.51) and PD activity (0.91/0.60). CONCLUSION: An ultrasonographic image acquisition protocol and joint-specific scoring system with reference atlas were developed and demonstrated moderate to excellent reliability for scoring of synovitis in patients with JIA. This can be a valuable tool in clinical practice and future research.
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