My little boy, who's almost 5, struggles every 3 to 4ish months with pain in his right leg. It's to the point his leg gives way and it lasts up to a week at a time. Gp thought he had a knock knee, but Orthopaedics have discharged him over this and had xrays to the hips only. But it's still happening. I feel awful sending him nursery woth it as he can hardly weight bare and is causing clumsiness, but once he is in school we have no choice but to send him. Had anyone had this and have any idea what it could be? He's the lower range of normal for iron and vitamin d levels...