The skier fractured a vertebrae and displaced her spine, the committee said.
The decision was made to operate on her immediately, the committee said.
The 23-year-old was in "unbearable" pain when she was rushed to the hospital, the state-run RIA Novosti news agency said.
Komissarova was training to compete in the ski-cross competition.
According to RIA Novosti, Komissarova's best finish was a second place at a World Cup in 2012, but she was not expected to be a medal contender in Sochi.