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O’Brien said the initial diagnosis was a non-displaced condylar fracture and described it as a small crack in the cannon bone.

It’s a repetitive strain injury that results in a fracture to the cannon bone above the fetlock due to large loads transmitted during high-speed workouts.

Go For Wand was leading by a head at the sixteenth pole when she suffered an open fracture to her right cannon bone.

The race lost luster Thursday when Omaha Beach pulled out with a problem in the right rear ankle that could have foreshadowed a cannon bone fracture.

“Many important lesions such as those in Mongolian Groom’s hind cannon bones are not easy to find,” according to the report.