Sissoko broke his arm in the first half against Birmingham. There was a 7-minute delay and he was tended to by team doctors from both Liverpool and Birmingham. They took him off on a stretcher, so that must be one seriously broken arm.
Dammit. The guy's a tackling, disruptive monster that was really needed for Arsenal this weekend. He lets everybody else take more chances going forward because he's hanging out there with the back four ready to knock the tar out of anyone to win the ball.