American skier Nina O’Brien suffered leg fractures in her crash in the Olympic giant slalom race on Monday, the nation’s ski federation has said. O’Brien, 24, crashed at the last gate of the second run and slid into the finish area. She was tended to for a long time on the spot before being taken to hospital in Yanqing where a broken left tibia and fibula was diagnosed and she underwent surgery. “An initial stabilization procedure was successfully performed by local doctors, and she received excellent care. She will return to the US for further evaluation and care,” the federation said. O’Brie…