He is fine guys, didn't you listen to his postgame interview, in the locker room?
[youtube]http://www.youtube.com/watch?featurev=y9FxyFgv1cE[/youtube]
Around 1 minute mark he says it was just a bump on his non-acl knee and he's fine.
Or Brad Stevens postgame interview?
[youtube]http://www.youtube.com/watch?v=LH9lT4ytTP4[/youtube]
Somewhere at the beginning he also says he's ok and Rondo was a little upset and gave him a look when he pulled him out of the game.