Tiarn Collins joins fellow snowboard crock Ormerod

New Zealand's Tiarn Collins in action during the slopestyle final at the Snowboard and Freestyle Ski World Championships in Sierra Nevada, Spain

New Zealand's Tiarn Collins has joined British snowboarder Katie Ormerod as a casualty of the Olympic slopestyle event after both had their hopes dashed by falls in training.

Collins, 18, regarded as one of New Zealand's best medal hopes in Pyeongchang, failed to respond to treatment to his injured shoulder after a heavy fall last weekend.

However, he will remain in Pyeongchang in the hope of recovering in time for the big air competition, which starts on February 21.

Earlier, Ormerod said she was "gutted" after a broken heel ruled Britain's snowboarding poster girl out of the Games.

The 20-year-old, who was also set to compete in slopestyle and big air, broke the bone in training on Thursday after shrugging off a wrist fracture a day earlier.

British medal hope Ormerod is set to undergo surgery to repair her injured foot.

"Words can't describe how gutted I am," she posted on her Instagram account.

"After dreaming of competing at the Olympics for years, I finally got there and received the most bad luck I've ever had."