Clinico-laboratory profile of Kawasaki disease with arthritis in children

Kawasaki disease (KD) is associated with several musculoskeletal manifestations. Although arthritis has been reported to occur in 2.3–31% of children with KD, there is paucity of detailed studies on the subject. We report our experience on arthritis in children with KD. Data were collated from a review of records of patients diagnosed with KD and arthritis during the period January 1994–June 2019. Eight hundred sixty-five children (male:female 29:11) were diagnosed with KD during this period—of these, 40 (4.6%) had arthritis. Median day of diagnosis of KD was 17 days. Twenty-nine (72.5%), 8 (20%), and 3 (8.6%) children developed arthritis in acute, subacute, and convalescent phases of KD, respectively. Oligoarticular involvement was observed in 32 (80%) children and among these, 7 (20%) had monoarthritis. Predominant joints involved were knee (74.3%), ankle (40%), and hip (28.6%). Thirty-two children (80%) were treated with non-steroidal anti-inflammatory drugs (NSAIDs). Median duration of arthritis was 10 days (range, 2–180 days) with uneventful recovery in all cases. Three (7.5%) children had coronary artery ectasia which regressed on follow-up. Conclusion : Arthritis in KD is usually non-erosive, self-limiting, and responds well to a short course of NSAIDs. What is Known: • Arthritis has been reported to occur in 2.3–31% of children with KD. • Arthritis in KD is usually oligoarticular, non-erosive, and responds well to short course of non-steroidal anti-inflammatory drugs . What is New: • Children with KD and arthritis do not appear to be at increased risk of development of coronary artery abnormalities. • Arthritis in children with KD can result in diagnostic confusion, and diagnosis of KD may get delayed.