My son has autism and is non-communicative. I would not say non-verbal, because he is able to speak. Yesterday, he was on his Razor Scooter (not eletrict), and hit a curb and fell off. He was cut, really cried hard (he has a high pain tolerance), but we didn't think much of it, because we could see no visible injuries other than a small scrap on his left knee. This morning, he woke up and cannot walk without assistance. His right knee is very swollen and he has a huge dark purple bruise just below it. Because he has a high pain tolerance and is mostly non-communicative, I took him to the ER. They did an X-Ray. He does not have any broken bones, and I was told it was a bruise and to go home. Give him Ibprofin and come back if it still hurts. I'm really concerned, because he is not putting any weight on his leg. He is also holding turning his knee inward when he stands and when he walks. And several times during the day, his knee would just give out and he would just fall down. He is 9 years old. He is normally hyper active, but now he is just laying around. He normally doesn't tantrum, but he is tantrumming a lot now. I don't know what to do. The doctor made me feel like I was over-reacting, but the way he is walking is not normal.