Other Causes

1. JRA. Also called chronic idiopathic arthritides of childhood. Cause unknown. One, few, or several joints may be involved, with or without systemic illness. Symptoms must be present for at least 6 weeks to meet diagnostic criteria. Has highly variable prognosis.

Complex regional pain syndrome. Formerly called reflex sympathetic dystrophy. Common in adolescent girls. Cause is unknown. Produces localized swelling, sweating, color changes, and pain with light touch; especially of distal extremities. Sickle cell anemia. Vasoocclusive crisis results in ischemia. Bony pain is often severe enough to prevent ambulation. Hemophilia. Patients are at risk for hemarthrosis, especially after trauma.

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