Transient synovitis is self-limited inflammation of the synovium. It can occur in any large joint, however it most commonly occurs in the hip.
The pathophysiology of transient synovitis is poorly understood, however there is thought to be a link between transient synovitis and antecedent viral infections. Patients often have a history of a recent upper respiratory infection.
The annual incidence of transient synovitis in children ages one to thirteen is 0.2%. It is more common in boys than girls, with a ratio of 2:1. The average age at presentation is six. Transient synovitis is the most common cause of hip pain in children.
Full Article - https://www.orthopaedia.com/pediatric-musculoskeletal-infections/#Transient-Synovitis
