LEXINGTON, KY. - Eight Belles had no diseases or pre-existing bone abnormalities that caused the filly to break down after finishing second in the Kentucky Derby.

Necropsy results reviewed Thursday confirm compound fractures of both front legs at the fetlock joints. They also describe lacerated skin on both legs, an absence of joint fluid in the damaged areas and congested lungs.

The filly also had a bruised head and hemorrhaging in the left thyroid gland, which the report blamed on her fall after the initial injuries.

"No pathology was found to indicate the occurrence of any other catastrophic event beside the fractured legs," wrote Kentucky chief veterinarian Lafe Nichols of the University of Kentucky's Livestock Disease Diagnostic Center.

Eight Belles was euthanized on the track at Churchill Downs after collapsing while jogging about a quarter-mile past the finish line.

There also will be routine post-race drug-testing and further medication tests requested by Eight Belles trainer Larry Jones, who said Thursday he believes the horse just tripped over her own feet.

"She's bad about stumbling while pulling up," Jones said. "She's doesn't pick her feet up very high. It's one reason she could run very fast and far. She had the perfect motion for being effective and efficient. However, those horses who do that have a tendency to want to stumble."