I was playing basketball yesterday and played one game and was fine, i started the second game took a shot and a very sharp pain came in both of my knees. It hurts to put pressure on them, not walking, but wakiling up stairs hurts. There is a bump on each knee abput and inch down from my knee caps, in the same place, that i have never noticed before. Does anyone have any idea what has happened, someone please help it hurts like a bitch, thanks.