I'm not sure if the doctor understood the question. I would think that Ankle problems and Knee problems. Though I been watching dancers : watch the ballerina while the dancer critics herself or it could be a teacher. Yet, there are some injuries that can't be explained, but now it could be 10 months. So I would have stressed: eat , stretch, go to sleep [ sleep is very important, gives time for the body to destress], follow the instructions of the teacher if you don't know, raise your hand [ another person may have been to shy to ask], AND PLENTY OF WATER.