Preview Clip of Grey's Anatomy Season 9, Episode 11: Ping-Pong ... For Eight Hours? (VIDEO)

Air date: January 15, 2012. 

It looks like Derek's (Patrick Dempsey) surgery-less days may be coming to an end on Grey's Anatomy Season 9. But first, he's going to have to put up with an unusual treatment on Episode 11: "The End Is the Beginning Is the End" (January 17).