Lindsey Vonn had surgery on her right knee that "went well" after she shredded two ligaments during a crash last week at the world championships, according to a person with knowledge of the situation.
The person spoke to The Associated Press on condition of anonymity because an announcement was scheduled later Sunday.
Dr. William Sterett, a physician for the U.S. ski team, operated Sunday on the four-time overall World Cup champion in Vail, Colo.
Vonn tore her anterior cruciate and medial collateral ligaments last week during the super-G in Schladming, Austria. She also broke a bone in her lower leg.
Sterett said earlier he wouldn't set a return date to skiing for Vonn until sometime after the surgery. But other doctors believe she could be sidelined for up to eight months.
That would give her time to get back to the slopes for the 2014 Sochi Winter Games, which are a year away. Vonn said recently she intends to defend her Olympic downhill title from the 2010 Vancouver Games.