KRASNAYA POLYANA, Russia — An American skier was stable and conscious Saturday at a hospital, where he was taken by helicopter after he crashed during the men’s sitting downhill competition at the Paralympic Games. The skier, Tyler Walker of Aspen, Colo., tumbled several times and lay motionless before members of the medical staff rushed to his side.

On his Facebook page, Walker, 27, posted a photograph of himself in what appears to be his hospital bed with the message: “I’m ok! I don’t remember crashing but I didn’t break anything. Thanks so much for all the support, it means everything. I totally got a ride in a Russian helicopter, though!”

Walker’s crash was the latest incident on a course that has drawn complaints for its bumpy terrain and soft, slushy snow. A freeze Friday night sealed the track and created favorable conditions for the early races, but the temperature had risen and the snow had lost its firmness by the time Walker raced in the sixth and final event of the day.

Starting with Walker, who raced 13th of 22, six of the final 10 skiers did not finish the course. In all, only 12 finished. Walker was scheduled to compete in three other events, including the super-G on Sunday, but his participation was uncertain. BEN SHPIGEL