Johan Djourou is down in the Arsenal box with what appears to be a dislocated shoulder after being tackled by his own player. With a low cross screaming into the box and Javier Hernandez bearing down on the ball, Bacary Sagna and Djourou frantically tried to scramble clear. Both failed - instead, Sagna caught Djourou's left arm with his right foot, and it looked for all the world as thought the centre back's shoulder has been yanked out of his socket, an extremely painful injury.
Manuel Almunia prevented United from adding insult to injury by somehow clawing the ball to safety, but with three substitutes used and Djourou on the ground for almost five minutes already, the goal doesn't matter much to Arsenal that much. Djourou's pairing with Laurent Koscielny had been just about the only reliable defensive partnership that Arsene Wenger's team had fielded all year, and losing him for any length of time will be a huge blow to the Gunners, who'll play the rest of the match with ten men. Awful day for Arsenal here as Djourou is stretchered off the pitch.