My 7 year old son got his foot caught in an ellipitcal machine last night (fell off and it got twisted in the bars). It hurt a bit but he was fine last night, running and playing. This morning he could not walk on it and he says it hurts by his Achilles tendon. He can t put weight on it and he says it hurts too when it hangs down (like when he is hopping on the other foot). There is no swelling at all and no bruising. I gave him so Motrin and talked to his teacher at school and he will be sitting with it elevated all day. Any idea what it could be? Do we need to head to the doctor?