Lindsey Vonn air-lifted after ski crash

Lindsey Vonn is being lifted by a helicopter during the women's Super-G event of the 2013 Ski World Championships in Schladming, Austria on Feb. 5, 2013.

Slovenia's Tina Maze reacts as she see United States' Lindsey Vonn crashing during the women's super-G at the Alpine skiing world championships in Schladming, Austria, Tuesday, Feb.5,2013.

Lindsey Vonn is transported by helicopter after a fall during the women's Super-G event of the 2013 Ski World Championships in Schladming, Austria on Feb. 5, 2013.

Lindsay Vonn is airlifted off the mountain after crashing while competing in the women's Super-G event during the Alpine FIS Ski World Championships on Feb. 5, 2013, in Schladming, Austria.

In this photo taken Sunday, Feb. 3, 2013, U.S. ski racer Lindsey Vonn attends a press conference in Schladming, Austria.

Lindsey Vonn is evacuated by a helicopter after falling during the women's Super-G event of the 2013 Ski World Championships in Schladming, Austria on Feb. 5, 2013.

Tina Maze of Slovenia reacts in the finish area to the crash of Lindsay Vonn in the women's Super-G event during the Alpine FIS Ski World Championships on Feb. 5, 2013, in Schladming, Austria.

Lindsey Vonn competes during the women's Super-G event of the 2013 Ski World Championships in Schladming, Austria on Feb. 5, 2013.

Lindsey Vonn is evacuated by a helicopter after falling during the women's Super-G event of the 2013 Ski World Championships in Schladming, Austria on Feb. 5, 2013.

Lindsey Vonn competes during the women's Super-G event of the 2013 Ski World Championships in Schladming, Austria on Feb. 5, 2013.

Christophe Pallot/Agence Zoom/Getty Images

Lindsey Vonn is helicoptered off the course during the Audi FIS Alpine Ski World Championships women's Super-G on Feb. 5, 2013, in Schladming, Austria.

Lindsay Vonn of the United States of America skis before crashing while competing in the women's Super-G event during the Alpine FIS Ski World Championships on Feb. 5, 2013, in Schladming, Austria.

Lindsey Vonn competes during the women's Super-G event of the 2013 Ski World Championships in Schladming, Austria on Feb. 5, 2013.

Lindsey Vonn is evacuated by a helicopter after falling during the women's Super-G event of the 2013 Ski World Championships in Schladming, Austria on Feb. 5, 2013.

Lindsey Vonn of the USA is helicoptered off the course during the Audi FIS Alpine Ski World Championships women's Super-G on Feb. 5, 2013, in Schladming, Austria.