Notice: Users may be experiencing issues with displaying some pages on stanfordhealthcare.org. We are working closely with our technical teams to resolve the issue as quickly as possible. Thank you for your patience.
This form of JRA affects about 50 percent of children with this disease, involving four or less joints. Large joints, such as the knees, ankles, or elbows are typically affected. This type of disease most often affects girls younger than age seven, and boys older than age eight.