Transient synovitis of the hip

The etiology is not known, but several theories have been proposed. The most common proposed cause is a temporary inflammation secondary to a viral upper respiratory tract infection or gastrointestinal illness. It has been noticed that many children who have transient synovitis of the hip have had a viral illness days to weeks before the onset of hip pain. The viral etiology has also been supported by the identification of elevated serum interferon levels. It is important to remember that transient synovitis, especially if recurrent or persistent, may be the initial feature of a chronic inflammatory condition such as juvenile idiopathic arthritis.[5]Uziel Y, Butbul-Aviel Y, Barash J, et al. Recurrent transient synovitis of the hip in childhood. Long-term outcome among 39 patients. J Rheumatol. 2006 Apr;33(4):810-1. http://www.ncbi.nlm.nih.gov/pubmed/16583482?tool=bestpractice.com Allergic predisposition, trauma, and growth abnormalities have all also been proposed to be associated with transient synovitis, but with little current support.

Transient synovitis of the hip is a condition in which there is nonspecific inflammation and hypertrophy of the synovium with an effusion in the hip joint.