Hello and welcome to healthcare magic Pain in leg and limping after an episide of fever points towards two important conditions 1.Transient synovitis 2.Myalgia Transient synovitis:In this condition the membrane lining hipjoint becomes sore.It only temporary and often resolves on its own.It usually follows a viral fever. Myalgia:In this case muscles are sore.Without history of trauma or overexertion Virus is almost always the cause.In this condition muscles ache to touch.This too is a temporary condition Treatment is similar for both Keep your child as much painfree and relaxed as possible by warm compressions, warm bath,adequate rest,adequate fluid intake and painkillers and ibuprofen. Hope you find this answer satisfactory.Good luck.