Sorry I know there was a thread on this but can't find it.I have a 6 yr old DS (who has Aspergers) who has recently started to walk with a slight limp. At least I think it's a limp - he appears really stiff and sometimes sort of holds his arms over his groin area and folds in whilst walking? Sorry, hard to explain. However, he can run, jump, trampoline etc no problem and says he feels no pain. It also seems to come and go. Could this be Perthers disease or am I being paranoid? He's always had a tendency to walk on tip toes but think that's ASD related? Thanks.