According to someone in attendance, Rhodes landed badly taking a backdrop in a Tag Team match for WWE Main Event and may have suffered a shoulder injury or a concussion. Rhodes was absent during a Team Ziggler segment later in the evening.
I also got the following text message from a fan in attendance:
"Looks like Cody Rhodes injured his shoulder at the SmackDown tapings during the main event. Kane flipped him over and instead of landing on his back he landed on his shoulder. He was just talking to the ringside doctor."