Schwarzenegger tripped over his ski pole and broke his right femur while skiing in Sun Valley, Idaho, with his family on December 23, 2006. On December 26, 2006, he underwent a 90-minute operation in which cables and screws were used to wire the broken bone back together. He was released from the St. John's Health Center on December 30, 2006.

What bone did Schwarzenegger break while on a ski trip in 2006?