My kid fell from a bike but luckily he did not broke anything. At least, that is what I thought at first. Now, it seems that he is having some problems keeping the leg in a normal position. He is always putting it into a specific position. Could this be a leg or maybe a pelvis injury? How to diagnose a pelvis disorder anyway?
Well, one of the symptoms would be the thing you have described. Try looking for some swelling and there is definitely some pain involved but maybe he is too embarrassed to tell. I think that you should take him to the doctor immediately; perhaps it is a bit more serious than it looked at first.