Canadian pairs skater Bryce Davison has undergone successful surgery on his injured knee, but how long he will be out of competition remains to be seen.

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Bryce Davison, right, injured himself in training last week, forcing him and partner Jessica Dubé to withdraw from Skate Canada. ((Damien Meyer/AFP/Getty Images))

A source told CBCSports.ca that there is major concern that the injury is career-threatening.

But one of Skate Canada's team doctors, Marni Wesner, said Thursday that Davison can "absolutely" recover from the injury, but that "it's too early to comment on when that will be or how long it's going to take."

The Huntsville, Ont., native underwent the knee surgery Tuesday, Wesner said. Davison hurt himself during a training session in Toronto last week.

Davison has osteochondritis dissecans, a pre-existing condition that causes a small area of bone and cartilage to lose its blood supply, which can cause that area of bone to break off during physical activity.

And that is how Davison suffered the injury, according to a source who saw it occur. He was practising triple loops when he came down on his landing knee slightly stiff and was in immediate pain.

The surgery, which was done in Toronto, reattached the broken piece of bone to his knee. Athletes with this type of injury have been known to undergo extremely difficult recovery periods.

Davison's agent, David Baden, told CBCSports.ca in an email that Davison is doing fine after surgery and that they will know more on his status next week.

He and partner Jessica Dubé were favoured to win the Skate Canada International competition this weekend in Kingston, Ont., before the pair had to withdraw due to Davison's injury.

The setback will also cost Davison and Dubé, from St-Cyrille-de-Wendover, Que., a spot in the season-ending Grand Prix final in Beijing in early December.

Dubé and Davison won bronze at the 2007-08 world championships and were sixth at the Vancouver Olympics. They will be replaced at Skate Canada by Kirsten Moore-Towers and Dylan Moscovitch of Waterloo, Ont.