my child is only 14 but suffers form joint pain. her kneescrack and crunch every time she moves. Lately she describes them as being jammed unable to crack - they click but cant crack and it hurts her. it often feels bruised and jarred and finds it painful to walk. these symtoms come and go . Also her hip cracks and crushes when she moves it and when she over exercises she can be in real excrusiating pain. Doees anyone no what i meen. she has had xrays and a mri on her hip but doctors cant find anything wrong HELP