A man has been trampled by a horse at the Royal Easter Show at Sydney Olympic Park.

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The 27-year-old rider was taken to hospital after he was knocked off his horse during an equestrian event on Saturday evening, helicopter response team CareFlight said in a statement.

He was treated by the show's medical team and paramedics from NSW Ambulance then taken to Westmead Hospital in a stable condition.

He suffered upper bodies injuries according to CareFlight's medical team.

- AAP