Trajectories of Physical Function in Canadian Children With Juvenile Idiopathic Arthritis - Summary - MDSpire
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Patterns of Physical Function in Canadian Youth Diagnosed with Juvenile Idiopathic Arthritis

  • By

  • Clare Cunningham

  • Meghan McPherson

  • Lillian Lim

  • Roberta A. Berard

  • Matthew Berkowitz

  • Jean-Philippe Proulx-Gauthier

  • Brian M. Feldman

  • Nicole Johnson

  • Dax G. Rumsey

  • Heinrike Schmeling

  • Lori B. Tucker

  • Thomas Loughin

  • Kristin M. Houghton

  • Jaime Guzman

  • May 14, 2026

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Objective:

To describe longitudinal trajectories of physical function in children with different JIA categories and identify baseline characteristics that may predict persisting functional impairments.

Approach:
  • Outcome Measures: Physical function was assessed using the Kids Disability Screen (KDS), which measures disability levels on a scale from 0 (no disability) to 10 (severe disability) in the context of JIA.
Key Findings:
  • Most children had mild to moderate functional impairments at diagnosis, improving with a median time to optimal function of 36 weeks.
  • Rheumatoid factor-positive polyarthritis had the largest functional impact, while psoriatic arthritis had the least.
  • 38% of patients were assigned to trajectories with persisting mild functional impairments, identifiable by a baseline KDS score ≥1.5.
  • No functional trajectories with persisting moderate or severe impairments were found, but 8% reported moderate to severe impairment at least once beyond two years post-diagnosis.
Interpretation:

The study highlights the improvement in physical function among children with JIA over time, with specific categories showing varying impacts on function.

Limitations:
  • The study may not capture long-term outcomes beyond the follow-up period.
  • Potential biases in self-reported data from parents and physicians.
Conclusion:

Early identification of patients at high risk for long-term functional impairments is crucial for timely interventions.

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