‘‘I just look at it like this: Yes, we’re in a dangerous sport,’’ fellow snowmobile rider Levi LaVallee said. ‘‘Anytime you’re doing a backflip on anything, it’s dangerous. But we’re training to do this. This is what we practice, what we do day in and day out. We’re comfortable with doing this stuff.’’

LaVallee recently described Moore as a ‘‘fierce competitor.’’

‘‘A very creative mind,’’ LaVallee said. ‘‘I've watched him try some crazy, crazy tricks and some of them were successful, some of them not so much. But he was first guy to get back on a sled and go try it again. It shows a lot of heart.’’

X Games officials said in a statement that they would conduct a thorough review of freestyle snowmobiling events and adopt any appropriate changes.

‘‘For 18 years, we have worked closely on safety issues with athletes, course designers and other experts. Still, when the world’s best compete at the highest level in any sport, risks remain,’’ they said, noting that Moore was hurt performing a move he had done several times before.

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