Ravelli A, Martini A (2007) Juvenile idiopathic arthritis. Lancet 369:767–778.

Article  CAS  PubMed  Google Scholar 

Gabriel SE, Michaud K (2009) Epidemiological studies in incidence, prevalence, mortality, and comorbidity of the rheumatic diseases. Arthritis Res Ther 11:229.

Article  PubMed  PubMed Central  Google Scholar 

Hemke R, Doria AS, Tzaribachev N et al (2014) Selecting magnetic resonance imaging (MRI) outcome measures for juvenile idiopathic arthritis (JIA) clinical trials: first report of the MRI in JIA special interest group. J Rheumatol 41:354–358.

Article  PubMed  Google Scholar 

Selvaag AM, Flato B, Dale K et al (2006) Radiographic and clinical outcome in early juvenile rheumatoid arthritis and juvenile spondyloarthropathy: a 3-year prospective study. J Rheumatol 33:1382–1391

PubMed  Google Scholar 

Wallace CA, Giannini EH, Spalding SJ et al (2014) Clinically inactive disease in a cohort of children with new-onset polyarticular juvenile idiopathic arthritis treated with early aggressive therapy: time to achievement, total duration, and predictors. J Rheumatol 41:1163–1170.

Article  PubMed  Google Scholar 

Johnson K (2006) Imaging of juvenile idiopathic arthritis. Pediatr Radiol 36:743–758.

Article  PubMed  Google Scholar 

Magni-Manzoni S, Malattia C, Lanni S, Ravelli A (2012) Advances and challenges in imaging in juvenile idiopathic arthritis. Nat Rev Rheumatol 8:329–336.

Article  CAS  PubMed  Google Scholar 

Hemke R, Maas M, van Veenendaal M et al (2014) Contrast-enhanced MRI compared with the physical examination in the evaluation of disease activity in juvenile idiopathic arthritis. Eur Radiol 24:327–334.

Article  PubMed  Google Scholar 

Gylys-Morin VM, Graham TB, Blebea JS et al (2001) Knee in early juvenile rheumatoid arthritis: MR imaging findings. Radiology 220:696–706.

Article  CAS  PubMed  Google Scholar 

Malattia C, Damasio MB, Magnaguagno F et al (2008) Magnetic resonance imaging, ultrasonography, and conventional radiography in the assessment of bone erosions in juvenile idiopathic arthritis. Arthritis Rheum 59:1764–1772.

Article  PubMed  Google Scholar 

Miller E, Uleryk E, Doria AS (2009) Evidence-based outcomes of studies addressing diagnostic accuracy of MRI of juvenile idiopathic arthritis. AJR Am J Roentgenol 192:1209–1218.

Article  PubMed  Google Scholar 

Hemke R, van Veenendaal M, Kuijpers TW et al (2012) Increasing feasibility and patient comfort of MRI in children with juvenile idiopathic arthritis. Pediatr Radiol 42:440–448.

Article  PubMed  PubMed Central  Google Scholar 

Tanturri de Horatio L, Damasio MB, Barbuti D et al (2012) MRI assessment of bone marrow in children with juvenile idiopathic arthritis: intra- and inter-observer variability. Pediatr Radiol 42:714–720.

Article  PubMed  Google Scholar 

Hemke R, van Rossum MA, van Veenendaal M et al (2013) Reliability and responsiveness of the Juvenile Arthritis MRI Scoring (JAMRIS) system for the knee. Eur Radiol 23:1075–1083.

Article  PubMed  Google Scholar 

Hemke R, Tzaribachev N, Nusman CM et al (2017) Magnetic Resonance Imaging (MRI) of the knee as an Outcome measure in Juvenile Idiopathic Arthritis: an OMERACT reliability study on MRI scales. J Rheumatol 44:1224–1230.

Article  PubMed  Google Scholar 

Hemke R, van den Berg JM, Nusman CM et al (2018) Contrast-enhanced MRI findings of the knee in healthy children; establishing normal values. Eur Radiol 28:1167–1174.

Article  PubMed  Google Scholar 

Herve-Somma CM, Sebag GH, Prieur AM et al (1992) Juvenile rheumatoid arthritis of the knee: MR evaluation with Gd-DOTA. Radiology 182:93–98.

Article  CAS  PubMed  Google Scholar 

Lamer S, Sebag GH (2000) MRI and ultrasound in children with juvenile chronic arthritis. Eur J Radiol 33:85–93.

Article  CAS  PubMed  Google Scholar 

Uhl M, Krauss M, Kern S et al (2001) The knee joint in early juvenile idiopathic arthritis. An ROC study for evaluating the diagnostic accuracy of contrast-enhanced MR imaging. Acta Radiol 42:6–9

CAS  PubMed  Google Scholar 

Johnson K, Wittkop B, Haigh F et al (2002) The early magnetic resonance imaging features of the knee in juvenile idiopathic arthritis. Clin Radiol 57:466–471.

Article  PubMed  Google Scholar 

Hemke R, Kuijpers TW, van den Berg JM et al (2013) The diagnostic accuracy of unenhanced MRI in the assessment of joint abnormalities in juvenile idiopathic arthritis. Eur Radiol 23:1998–2004.

Article  PubMed  Google Scholar 

Stomp W, Krabben A, van der Heijde D et al (2015) Aiming for a simpler early arthritis MRI protocol: can Gd contrast administration be eliminated? Eur Radiol 25:1520–1527.

Article  PubMed  Google Scholar 

Eshed I, Krabbe S, Ostergaard M et al (2015) Influence of field strength, coil type and image resolution on assessment of synovitis by unenhanced MRI–a comparison with contrast-enhanced MRI. Eur Radiol 25:1059–1067.

Article  PubMed  Google Scholar 

Nusman CM, Ording Muller LS, Hemke R et al (2016) Current status of efforts on standardizing magnetic resonance imaging of Juvenile Idiopathic Arthritis: Report from the OMERACT MRI in JIA Working Group and Health-e-Child. J Rheumatol 43:239–244.

Article  PubMed  Google Scholar 

White CM, Kesler WW, Miner L, Flemming D (2022) MR imaging knee Synovitis and Synovial Pathology. Magn Reson Imaging Clin N Am 30:277–291.

Article  PubMed  Google Scholar 

Bhargava R, Hahn G, Hirsch W et al (2013) Contrast-enhanced magnetic resonance imaging in pediatric patients: review and recommendations for current practice. Magn Reson Insights 6:95–111.

Article  PubMed  PubMed Central  Google Scholar 

Ostergaard M, Conaghan PG, O’Connor P et al (2009) Reducing invasiveness, duration, and cost of magnetic resonance imaging in rheumatoid arthritis by omitting intravenous contrast injection -- does it change the assessment of inflammatory and destructive joint changes by the OMERACT RAMRIS? J Rheumatol 36:1806–1810.

Article  PubMed  Google Scholar 

Tamai M, Kawakami A, Uetani M et al (2012) Magnetic resonance imaging (MRI) detection of synovitis and bone lesions of the wrists and finger joints in early-stage rheumatoid arthritis: comparison of the accuracy of plain MRI-based findings and gadolinium-diethylenetriamine pentaacetic acid-enhanced MRI-based findings. Mod Rheumatol 22:654–658.

Article  PubMed  Google Scholar 

Burke CJ, Alizai H, Beltran LS, Regatte RR (2019) MRI of synovitis and joint fluid. J Magn Reson Imaging 49:1512–1527.

Article  PubMed  PubMed Central  Google Scholar 

Vo Chieu VD, Vo Chieu V, Dressler F et al (2023) Juvenile idiopathic arthritis of the knee: is contrast needed to score disease activity when using an augmented MRI protocol comprising PD-weighted sequences? Eur Radiol 33:3775–3784.

Article  CAS  PubMed  Google Scholar 

Milks KS, Singh J, Benedict JA, Rees MA (2023) Fluid-attenuated inversion-recovery sequence with fat suppression as an alternative to contrast-enhanced MRI in pediatric synovitis. Pediatr Radiol.

Article  PubMed  Google Scholar 

Fitzmaurice GM (2011) Applied longitudinal analysis. Wiley, Hoboken, New Jersey

Book  Google Scholar 

SAS Institute Inc (2015) SAS/IML® 14.1 user’s guide. Cary NSII

Google Scholar 

Lin LI (1989) A concordance correlation coefficient to evaluate reproducibility. Biometrics 45:255–268

Article  CAS  PubMed  Google Scholar 

Everitt BS (1981) Statistical Methods for Rates and Proportions. Biometric Society, pp 867–867

Ostergaard M, Klarlund M (2001) Importance of timing of post-contrast MRI in rheumatoid arthritis: what happens during the first 60 minutes after IV gadolinium-DTPA? Ann Rheum Dis 60:1050–1054.

Article  CAS  PubMed  PubMed Central  Google Scholar