from BBC: http://news.bbc.co.uk/sport2/hi/front_page/6295385.stm
The guy is one of the best knee surgeons in the world and a leader in microfracture. Kleiza didn't go to get diagnosed. He went to have surgery from one of the best in the world.
Ask any professional athlete if they ever play 100%, pain-free. I guarantee you from basketball to hockey to baseball to football to rugby to golf to whatever they all say no. Except curling and darts.