• American suffered puncture wound in crash last year
• Shiffrin says she will still ski in slalom and team event

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 American holder of a record 99 World Cup wins suffered a deep puncture wound when she fell in a giant slalom race on 30 November in Killington, Vermont, causing severe trauma to her oblique muscles.