see also [[paediatric limp]] - nonspecific inflammation and hypertrophy of synovium of hip joint - **most common cause of acute hip pain** age 3-10 - recent URTI in 50% of cases **history** - hip pain, unilateral or gorin most common - some report medial thigh or knee pain - crying at night - limp - often history of trauma may be predisposing factor or cause **exam** - usually no fever - mild restriction in motion, esp to ABduction and internal rotation - may be painful on passive movement or tender to palpation **Ix** - WCC may be elevated - ESR may be slightly eelvated - normal XR - USS usually identifies effusion - 1 in 4 have bilateral effusions - hip aspiration to exclude other causes **Management** - admit and observe if [[bone and joint infection (paeds)|septic arthritis]] not excluded - analgesia, anti-inflammatories - heat and massage - review in 12-24 hours - usualy improve in 24-48 hours with rest - consider alternative dx if sx persist for 7-10 days