By Press Association
Published: 01:13 BST, 13 August 2017 | Updated: 01:13 BST, 13 August 2017
Jockey William Buick is 'conscious, but complaining of back pain' after he fell from the fatally-injured Permian in the Secretariat Stakes at Arlington Park.
The Mark Johnston-trained colt had to be put down when the three-year-old son of Teofilo sustained a broken leg in the mile-and-a-quarter Grade One at the Illinois circuit.
Permian unseated Buick soon after the partnership crossed