Lindsey Vonn sustained a "substantial fracture" to her left knee when she crashed in Soldeu-El Tarter on Saturday.
The American made an astounding return to the slopes in Andorra on Sunday just a day after an accident which she thought had left her with a hairline fracture.
Vonn was fastest in the super-G run in the FIS Alpine Skiing World Cup combined event despite her injury and finished 13th overall following the slalom to increase her overall lead over Lara Gut to 28 points.
The 31-year-old then went for a scan which showed a fracture had been sustained and she will now decide a course of action as she attempts to win the overall title after already sealing the downhill globe.
Vonn posted a picture of her scan on instagram and said: "So the MRI shows a pretty substantial fracture in my tibial plateau. MCL looks decent as well as the rest of my knee.
"Now I will talk to my trainers and make a plan. I'll keep you guys updated. Big thanks to everyone who helped me get through today and to the fans that always supported me!"
Canadian Marie-Michele Gagnon won the combined event.