M09.1: Juvenile arthritis in Crohn disease [regional enteritis]

Juvenile arthritis in Crohn's disease, also known as regional enteritis, is a specific condition where inflammation from Crohn's disease triggers arthritis in children and adolescents. Crohn's is a chronic disorder that inflames the digestive tract, particularly the end section of the small intestine and the beginning of the large intestine. In some young patients, this inflammation can also affect the joints, causing juvenile arthritis, which may present as swelling, pain, and stiffness, particularly in the mornings or after periods of inactivity. This secondary arthritis commonly affects the knees and ankles, and may vary in intensity from mild to severe. Juvenile arthritis in Crohn's disease represents a complex interaction between the gastrointestinal system and the immune system, with the inflammation of the former potentially inciting issues in the latter. Symptoms may intensify during Crohn’s flare-ups.