my 12 year ols jumped off of the top of a dugout onto concrete 3 days ago. She is having incresing pain to the point that she cant walk. Her pain seemed to be localized to her knees but is no through out her legs and in her lower back and ankle. There is minimal swelling that just appeared today medially on her right knee. I took her to a med express last night that did some xrays of her knees and feet. They said the didnt see anything. SHould I be concerned?