I am a 16 year old basketball player and last month sprained my ankle for the 3rd time. while i was playing basketbalI i jumped up and got knocked down. I tried to land on my feet but ended up on my butt. When i tried to stand up, it took me a while. I thought i dislocated my knee but i could still limp on it. I tried walking normally and realized i couldn t extend my knee fully. It s been an 6 hours since the incident and the swelling is almost completely gone&i can walk a little better. HOWEVER i can not fully extend my knee due to a sharp pain almost behind and bellow the knee cap.i want to be able to play badminton in the next 2weeks. (i ve wrapped the knee but it isn t helping the inside pain when i try to extend it) Is this a serious injury, or an injury at all?