Vonn was in the lead when she lost her balance and slid off course, the Associated Press reports. The race was interrupted for about 10 minutes while Vonn was carried off the mountain.
The Sports Illustrated Swimsuit Edition star posted an update of her injuries on Instagram Saturday afternoon.
"Got caught in the soft snow today and crashed pretty hard," she captioned a photo of her puppy and bandaged knee. "X-rays showed I have a hairline fracture in my left knee and will get an MRI Monday. I will wait and see how I feel tomorrow to decide if I can race. Will keep u updated. Thx for all of the support and well wishes. Means a lot!"
Vonn also offered congratulations to teammate Laurenne Ross, who ended up winning second place in the race. Italy's Federica Brignone, who had been 0.32 seconds behind Vonn before the crash, took first place.
The pro skier has a history of serious injuries. She fractured her ankle last summer, had to pull out of the 2014 Sochi Winter Olympics due to a major knee injury and was airlifted out of the 2013 Alpine World Championships after suffering a bad crash on the slopes.