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Updated: Jun 28, 2025
Knee Arthrocentesis in Adults
Published on: February 25, 2022
Does sacroiliitis is a mandatory criterion for enthesitis-related arthritis diagnosis?
Hanene Lassoued Ferjani1, Lobna Kharrat2, Dorra Ben Nessib1
1Rheumatology Department, Kassab Orthopedics Institute, Ksar Saïd, Tunisia; Faculty of Medicine of Tunis, University Tunis el Manar, Tunisia; Research Unit UR17SP04, Ksar Saïd, 2010 Tunis, Tunisia.
Introduction And Objectives:
Magnetic resonance imaging (MRI) sensitivity and specificity seem to be less studied in enthesitis-related arthritis (ERA). We aimed to determine the ability of sacroiliac MRI to diagnose ERA patients.
Materials And Methods:
We conducted a retrospective study including 44 patients with juvenile idiopathic arthritis (JIA). Each patient had a sacroiliac joint MRI. We divided patients into two groups: G1 patients with ERA and G2 patients with non-ERA subtype.
Results:
ERA was noted in 61% of the cases. Sacroiliac joints were painful in 15 patients (34%). MRI was normal in 25 patients (57%) (G1:11 versus G2:14) and showed bone marrow edema in the sacroiliac joints in 19 patients (34%) (G1=16 versus G2=3, p=0.005). Sacroiliac joints MRI's sensitivity and specificity in the ERA diagnosis were 61.54% and 82.35%, respectively. Positive and negative predictive values were 84.21% and 58.33%, respectively. Furthermore, sacroiliac joint pain in the clinical examination was able to predict sacroiliac bone edema in MRI with an odds ratio of 6.8 (95% CI 1.68-28.09; p=0.006).
Conclusion:
Our study showed that sacroiliac joint MRI has good specificity and positive predictive value in the diagnosis of ERA patients among JIA patients. This underlines the usefulness of sacroiliac joint MRI in the early diagnosis of ERA patients.
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