Vonn suffers concussion ahead of world championships

ZWIESEL, Germany - World Cup champion Lindsey Vonn says she sustained a concussion in a crash during practice and is still not sure whether she will compete in the final two races before the world championships.

Vonn tells The Associated Press she will have a medical check Friday morning before deciding whether to race in a World Cup slalom race.

A giant slalom is scheduled for Saturday.

The American hit her head in a crash Wednesday while practising the giant slalom in Austria.

Vonn is hoping to defend her super-G and downhill titles at the world championships beginning Feb. 8 in Garmisch-Partenkirchen, Germany.

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  Lindsey Vonn of the United States speeds down the course to take the third place in an alpine ski women's World Cup downhill race, in Cortina d' Ampezzo, Italy, Saturday, Jan. 22, 2011. (AP/Armando Trovati)

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  Lindsey Vonn of the United States, shows the gold medal she won in the Women's downhill, during the medal ceremony at the Vancouver 2010 Olympics in Whistler, British Columbia, Wednesday, Feb. 17, 2010. (AP Photo/Luca Bruno)