Fell on my knee during a rugby game it really hurts to bend or toutch it i can walk as long as i don't bend it what could be wrong it's swollen bruise?

Sounds like a cont--: Usion of the knee definitely, but i will be concerned about a twisting injury to it. I would have it checked out for a meniscal injury. Have it xrayed and possibly a MRI as the examination can be difficult for you. Resting in a knee immobilizer, iceing it, nsaids and a compression bandage would be helpful in the first week till a formal DX has been made. Keep with crutches for nwb. See orthopedist.