'Devastated' Vonn vows to come back stronger

US downhill star forced to miss Olympics due to reconstructive knee surgery

Less than two weeks after reconstructive surgery on her right knee last February, Lindsey Vonn already was sounding a positive note, saying she was "really looking forward to Sochi" and defending her Olympic downhill gold medal.

But along the way to the next Winter Games, Vonn began facing setbacks.