11/22/2012 06:33 EST | Updated 01/22/2013 05:12 EST

Swiss skier Daniel Albrecht injured in downhill training crash at Lake Louise

LAKE LOUISE, Alta. - Swiss skier Daniel Albrecht has sustained a serious knee injury after crashing in training for a World Cup downhill race at Lake Louise.

Albrecht has rarely raced in speed events in nearly four years since spending 16 days in an induced coma to recover from brain and lung injuries after he crashed heavily in downhill training at Kitzbuehel, Austria.

The Swiss ski federation says Albrecht sustained a "complex injury" to his left knee Thursday, but no head injury.

The 29-year-old skier, who started with bib No. 67, was airlifted by helicopter from the slope and later treated in Calgary.

Albrecht was the 2007 world champion in super-combined and a four-time winner on the World Cup circuit, but has been unable to find top form since his Kitzbuehel accident.