Mikaela Shiffrin is still feeling the effects of a violent crash she experienced in Killington, Vermont, on November 30. But it’s the mental recovery that’s taking more time than the physical recuperation for the most decorated alpine skier in history.

Mikaela Shiffrin says she is dealing with post-traumatic stress disorder following a crash in November and will not defend her gold medal in giant slalom at the Alpine skiing world championships.

The legendary American says she's suffering from post-traumatic stress disorder after a fall in a giant slalom race on Nov. 30. In the race, Italian Federica Brignone won gold, while USA's Paula Moltzan took bronze for her first individual world championship medal.