On Monday, Canadian halfpipe skier Justin Dorey pulled out of competing at this week's X Games Aspen 2013, where he was a favorite to compete in Men's Ski SuperPipe.

Dorey says he is unable to compete this week due to a shoulder injury that's been plaguing him since he first dislocated his left shoulder in crash in the halfpipe during X Games Aspen in January 2012.

"I originally planned to get surgery last spring after the season, but my shoulder felt so good, I opted out of surgery," Dorey told XGames.com on Tuesday.

This past weekend, while training in Breckenridge, Colo., Dorey says his shoulder popped out of its socket again, this time more severely -- it did damage to his joint, severed some tendons, and tore his rotator cuff. He is scheduled to undergo surgery on his shoulder this Thursday in Canada.

"This would have been my eighth X Games and I was really excited to compete this week," Dorey said. "Now, unfortunately, I'll be heading back to Canada to get surgery and I'll have to watch the X Games on TV."

In December, Dorey won the first major halfpipe contest of the season, the Dew Tour's Ion Mountain Championships in Breckenridge. He earned his winning score on his first run and on his second run, his shoulder dislocated midair. "It wasn't too traumatic," Dorey says about the dislocation at Dew Tour. "I waited a few weeks to get back on snow, then I started training again after Christmas."

He was feeling strong heading into this week's X Games Aspen. After this week's surgery, doctors say Dorey will need three to four months of recovery before he's back on snow. "I hope to be back skiing by late spring," Dorey says.

The Men's Ski SuperPipe Eliminations take place Thursday, Jan. 24 from 10:30 a.m. to 12 p.m. MT. You can tune in to those live right here on XGames.com.