Great Britain international showjumper Tina Fletcher is to undergo surgery after suffering a serious ankle injury while competing in Canada.
Fletcher, who was the reserve rider for Britain's London 2012 gold medal-winning team of Nick Skelton, Ben Maher, Scott Brash and Peter Charles, fell from Hello Sailor during the CN International Grand Prix at Spruce Meadows.
Fletcher's horse crashed through the second element of a double, throwing her to the ground before she was dragged along the floor after her leg caught in the reins.
She is understood to have suffered ligament damage, while one of the horse's shoe studs went into her Achilles' tendon.
"She is in considerable pain," Fletcher's husband Graham told www.horseandhound.co.uk.
"She's going to have surgery when we get back, so we will know more then."
Fletcher, 47, was travelling reserve with Hello Sailor for the Olympics and she has ridden in more than 20 Nations Cup competitions.
She also won last year's Hickstead Derby.