Jockey Harriet Tucker defied a dislocated shoulder to guide Pacha Du Polder to success in the Foxhunter Chase at Cheltenham.
Tucker said her shoulder popped out as she jumped the second-last fence with Pacha Du Polder, a 25-1 shot trained by Paul Nicholls, leading the field.
"I was praying no-one was going to beat me because I couldn't hit him any more with my right hand," she said.
"I had to keep pushing and screaming at him and he just got there."
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Tucker said she suffered the injury in her previous race and was told by doctors she did not need an operation.
"It half dislocates so I can put it back in myself," she told BBC Radio 5 live. "I popped it back in after the race.
"I jumped the last and when I lifted my stick over my shoulder it came out and I tried to push it back in.
"I thought I was going to lose. I didn't think I'd keep it. But he stuck in there, bless him."
Tucker's brave victory made her the 14th female jockey ever to register a win at the Festival.