Reigning world champion Kaya Turski of Canada crashed in both runs of the women's ski slopestyle qualification round Tuesday in Sochi and failed to advance to the medal round.
The 25-year-old from Montreal underwent knee surgery to repair the anterior cruciate ligament in her left knee in August, and has only been training on snow since Dec 9.
After crashing in her first run of the two-run final, Turski needed to post a score higher than 70.6 to advance to the final. But she went down again, finishing her Olympic campaign in 18th place with a score of 28.0.
Dara Howell of Huntsville, Ont., scored an 88.8 on her first run to lead all qualifiers. Teammate Kim Lamarre of Quebec City scored 85.4 and sits in second heading into the final, while Yuki Tsubota of Whistler, B.C., scored an 81.0 to place fourth.
The top 12 competitors advanced to the final, which goes later Tuesday with a clean slate.