Hi my son developed a ache in his right thigh last night, he woke up at 4am in a lot of pain that didnt really ease with Calpol and couldnt weight bare so we took him to A&E who xray him (which was fine) and given him more pain relief to see if he could walk, when he did try his leg twisted and gave way. They sent him home saying to give him pain relief and to take him back on monday morning for ultrasound and bloods. His notes said ?? Perthes disease. he has been pretty much the same all day then about 1 hour ago he suddenly improved, he can now stand and can even walk with only slight ache. Would you think if it is what they think it can improve so quick, we thinking maybe a strain or something or do we still need to take him for tests on monday