My 14 year old injured her knee during kenpo training and has been having a problem with fluid build up on the knee since then. She didn't make the switch to aikido when I left so she hasn't been training on it but she has been doing a lot of running and walking to stay fit. She works out MA with me from time to time but we are always very careful of the knee. Any ideas on how to fix this with out going in to have it drawn off with a needle? She is terrified of the needle idea so I promised her I'd check here before I took her back to the doctor.