"How tough do you have to be to play this game? Staley thought he broke his arm in the first quarter while he was blocking Clay Matthews. In the second quarter on a 4-yard run by Frank Gore, Staley wrenched the arm again when he collided with Mike Iupati and you could hear him scream in agony right through the broadcast. He stayed in the game."

http://blog.sfgate.com/49ers/2013/01/16/final-thoughts-and-observations-from-the-49ers-win-over-green-bay/