RT Journal Article
SR Electronic
T1 Feasibility and Reliability of the Spondyloarthritis Research Consortium of Canada Sacroiliac Joint Structural Score in Children
JF The Journal of Rheumatology
JO J Rheumatol
FD The Journal of Rheumatology
SP 1411
OP 1417
DO 10.3899/jrheum.171329
VO 45
IS 10
A1 Pamela F. Weiss
A1 Walter P. Maksymowych
A1 Robert G. Lambert
A1 Jacob L. Jaremko
A1 David M. Biko
A1 Joel Paschke
A1 Timothy G. Brandon
A1 Rui Xiao
A1 Nancy A. Chauvin
YR 2018
UL http://www.jrheum.org/content/45/10/1411.abstract
AB Objective. There is a critical need for measures to evaluate structural progression in the pediatric sacroiliac joint (SIJ). We aimed to evaluate the construct validity and reliability of the Spondyloarthritis Research Consortium of Canada SIJ Structural Score (SSS) in children with suspected or confirmed juvenile spondyloarthritis.Methods. The SSS assesses structural lesions of the SIJ on magnetic resonance imaging (MRI) through the cartilaginous part of the joint. We conducted 3 sequential reading exercises with 6 readers (1 adult and 3 pediatric radiologists, 1 adult and 1 pediatric rheumatologist). Each exercise was preceded by a calibration module. Interobserver reliability was assessed using intraclass correlation coefficients (ICC). Prespecified acceptable reliability thresholds were ICC > 0.5 for erosion, backfill, and sclerosis, and ICC > 0.7 for ankylosis and fat metaplasia.Results. The SSS had face validity and was feasible to score in pediatric cases for all 3 reading exercises. Of the cases used in the 3 exercises, 58% were male and the median age was 14 years (range 6.8–18.7 yrs). After calibration, median ICC across all readers for each SSS component were the following: erosion 0.67 (interquartile range 0.54–0.80), backfill 0.33 (0.19–0.52), fat metaplasia 0.74 (0.62–0.85), sclerosis 0.63 (0.48–0.77), and ankylosis 0.44 (0.28–0.62). Prespecified reliability thresholds were achieved in the third exercise for erosion, sclerosis, and fat metaplasia but not for backfill or ankylosis.Conclusion. The SSS was feasible to score and had acceptable reliability for pediatric SIJ MRI evaluation. The ICC improved with additional calibration and reading exercises, even for readers with limited experience.