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Patterns of clinical joint inflammation in juvenile idiopathic arthritis
Sascha L Heckert1, Petra C E Hissink-Muller2, J Merlijn van den Berg3
1Rheumatology, Leiden University Medical Center, Leiden, The Netherlands s.l.heckert@lumc.nl.
Insights
In juvenile idiopathic arthritis (JIA), joint inflammation often recurs in the same joints affected at disease onset. This suggests local factors may influence JIA flare occurrence.
Area of Science:
- Pediatric Rheumatology
- Immunology
- Clinical Medicine
Background:
- Juvenile idiopathic arthritis (JIA) is a chronic autoimmune disease affecting children.
- Understanding patterns of joint inflammation is crucial for managing JIA.
- Recurrence of inflammation in specific joints may indicate underlying local disease processes.
Purpose of the Study:
- To investigate the recurrence patterns of joint inflammation in juvenile idiopathic arthritis.
- To determine if joint inflammation at disease onset predicts future inflammation in the same joint.
- To explore the potential role of local factors in JIA flares.
Main Methods:
- Clinical assessment of joints in 91 children with recent-onset JIA over 2 years.
- Utilized a treat-to-target trial (BeSt for Kids study).
- Employed multilevel mixed-effects logistic regression and Poisson models to analyze joint inflammation recurrence.
Main Results:
- 15% of 6097 joints studied showed inflammation at baseline.
- Inflammation recurred in 42% of initially inflamed joints during follow-up.
- Baseline joint inflammation significantly predicted subsequent inflammation (OR 3.9) and recurrence episodes (IRR 1.6).
Conclusions:
- Joint inflammation in JIA demonstrates a tendency to recur in previously affected joints.
- This recurrence suggests that local factors play a significant role in JIA flare development.
- Findings highlight the importance of monitoring previously inflamed joints for potential flares.
Objectives:
We studied patterns of joint inflammation in juvenile idiopathic arthritis (JIA) to assess whether joint activity recurs locally in the same joints.
Methods:
Joints of 91 patients of the BeSt for Kids study, a treat-to-target trial for children with recent-onset oligoarticular, rheumatoid factor-negative polyarticular and psoriatic JIA, were clinically assessed during 2 years (10 study visits). The association between joint inflammation at baseline and later inflammation in the same joint was assessed using a multilevel mixed-effects logistic regression model at joint level. With a Poisson model, the association between baseline joint inflammation and the number of study visits at which the same joint was recurrently inflamed was tested.
Results:
Of the 6097 joints studied, 15% (897) was clinically inflamed at baseline. In 42% (377/897) of those joints, inflammation recurred during follow-up. Joint inflammation at baseline was statistically significantly associated with joint inflammation during follow-up in the same joint (OR 3.9, 95% CI 3.5 to 4.4) and specifically with the number of episodes of recurrent joint inflammation (IRR 1.6, 95% CI 1.2 to 2.1).
Conclusion:
In JIA, joint inflammation has the tendency to recur multiple times in joints that are clinically inflamed at disease onset. This indicates that local factors might play a role in the processes contributing to the occurrence of JIA flares.
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