* American withdraws to concentrate on halfpipe
* Says injury risk too much of a gamble (Adds IOC reaction)
By Julien Pretot
ROSA KHUTOR, Russia Feb 5 (Reuters) - Snowboarding star Shaun White pulled out of the slopestyle event at the Sochi Olympics on Wednesday due to concerns that the course is too dangerous.
Double halfpipe Olympic champion White, one of the biggest drawcards of the winter Games, said in a statement carried by NBC on Wednesday that he did not want to risk his chances of winning a third halfpipe gold medal.
White's decision comes after Norwegian Torstein Horgmo, a triple X Games gold medallist in Big Air, broke his collarbone in a crash on Monday and will miss the Games.
White also hurt his wrist on Tuesday after falling on a course he had earlier described as "intimidating".
"With the practice runs I have taken, even after course modifications and watching fellow athletes get hurt, the potential risk of injury is a bit too much for me to gamble my other Olympics goals on," said White.
After securing the halfpipe titles in 2006 and 2010, White was looking to add the slopestyle gold to his tally as the event makes its Olympic debut in Sochi.
The slopestyle events start at the Rosa Khutor Extreme Park with qualifying runs on Thursday.
U.S. Snowboarding & Free Skiing director Jeremy Forster said he understood the decision.
"Shaun is the consummate professional and has made a sound athletic decision," he said.
"We anticipate an outstanding slopestyle debut on Saturday, but also respect the importance to Shaun to keep his focus on winning a third halfpipe gold."
Several athletes have spoken out about the risks posed by the course, despite changes being made.
"The big jumps are very big, especially for the girls," Russia's Sarka Pancochova told reporters on Wednesday. "We are very little, we have 30kg difference to the guys. It's hard to get the speed you need."
The IOC, however, played down the concerns.
"It's a tough sport, we all know that," said IOC spokesman Mark Adams. "There have been a few changes made to the course but that is normal.
"When you have a number of disciplines you want to win you concentrate on that," he added, in reference to White's comment about saving himself for his halfpipe defence.
The 27-year-old White will now start his Sochi campaign on Tuesday with halfpipe qualifying.
The opening ceremony for the Games is on Friday. (Additional reporting by Philip O'Connor, editing by Ed Osmond)