x-rays

Cody has taken Ava to get her arm x-rayed just now. She fell off our bed yesterday from a standing position and hit the nightstand on her way down. I didn't see it happen, but I heard the loud thud. Ever since it happened, she will not move her right arm. At first I thought her arm was hurt. Then I started thinking it was her rib cage and breast bone area instead. Now I am unsure. I took her to the pediatrician this morning. He couldn't pinpoint the cause of her pain either. The immobility of her arm concerned him though, so he wants x-rays to rule out an arm injury. If indeed her arm is uninjured, then we know it is a rib cage injury, and there is no treatment for that really. I guess we'll have some answers later this afternoon. The strange thing is that there is not a mark on her. No bruise, swelling, or anything. I know she must have hit hard so I can't figure out why there's no bruising.