Mikaela Shiffrin will miss a second chance to clinch a historic 100th World Cup victory in alpine skiing later on Sunday because she will sit out a slalom race after a heavy crash the previous day in an American home race.

Shiffrin said on social media late Saturday that she will be "cheering from the sideline" at the slalom in Killington, Vermont.

Shiffrin fell towards the end of the Killington giant slalom in leading position and crashed into the safety nets. She was taken down on a sled and then to hospital for examinations where a left hip abrasion was diagnosed.

"Not really too much cause for concern at this point, I just can't move," she said later.

"I have a pretty good abrasion, and something stabbed me? But I'm okay. I am so sorry to scare everybody, and it looks like all scans so far are clear, so thank you so much for your support and concern."

Shiffrin may be fit to return to action next weekend in Tremblant, Canada, where two giant slaloms are scheduled.

She would have been the big favourite to complete the century of victories on Sunday in Killington because the slalom is her pet event. She has won the last six races in the discipline for a career total of 62, and six of the seven slaloms in Killington.

"It's just so sad to see Mikaela crash like that skiing so well. It breaks my heart and everybody else's here. We all cheer for Mikaela to come (back) stronger," giant slalom winner Sara Hector of Sweden said.

Saturday's race was Shiffrin's first opportunity to reach 100 wins after the posted her 99th a week ago in Görgl, Austria. The next best skier is former Swedish great Ingemar Stenmark with 86 victories.