Defending overall World Cup champion Lindsey Vonn of the United States was released from hospital Wednesday after being treated for a fall during a training session earlier that day.

Vonn suffered a bruised left knee in the fall on the Copper Mountain course before being taken to the Vail Valley Medical Center hospital for treatment, said US ski team doctor Richard Quincy. She suffered no ligament or cartilage damage.

US officials could not say when she would return to the World Cup circuit .

The reigning overall and downhill World Cup champion Vonn captured the first World Cup slalom podium of her career with a dominating victory at the opening slalom of the 2009 World Cup season in Finland on the weekend.

The next ladies World Cup competition is a Super-G race November 29 in Aspen, Colorado.