Prognosis

• at long-term follow-up, 12% to 28% of patients describe hip pain after intensive physical exertion, and 0% to 18% had some limitation to range of hip motion (1)
• a child who has had problems with an irritable hip is at a slightly increased risk of further episodes of this condition. This is usually benign although in about 10% it may be the presenting feature of a chronic inflammatory condition (2)

References:

1. Asche SS, van Rijn RM, Bessems JH, et al. What is the clinical course of transient synovitis in children: a systematic review of the literature. Chiropr Man Therap. 2013 Nov 14;21(1):39.
2. 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.