Vonn crashed on Thursday during training and ''severely" fracturing the humerus bone in her right arm.
Lindsey Vonn faces an injury layoff after breaking her arm in a training fall, the American skiing star revealed on Friday.
Vonn, 32, said she crashed on Thursday during training at Copper Mountain, Colorado, "severely" fracturing the humerus bone in her right arm.
"I had successful surgery last night in Vail and everyone took great care of me," Vonn wrote on Facebook.
"While I am beyond frustrated by this latest setback, at least my knees are ok and I will return to the slopes as soon as possible, as I always do!" she added.
Vonn, the 2010 Winter Olympics downhill champion, has said she is focusing on downhill and Super-G this season.
The eight-time World Cup downhill champion is expected to target the World Ski Championships in St Moritz in February.
Vonn has worked her way back to fitness in recent seasons after suffering a serious knee injury in 2013.
Her attempt to come back from that injury in time for the 2014 Olympics ended when she re-injured the knee while skiing in France.
As well as her 2010 Olympic crown, Vonn two world titles in 2009, the downhill and Super-G. She has 76 World Cup victories, a record for a woman, and only 10 behind the 86 held by Swedish legend Ingemar Stenmark.