I\'m not a vet, but I would think that the more likely scenario is that the steroids are keeping unsound horses on the track that shouldn\'t be by covering up injuries that would otherwise be detected. They also would give a horse more muscle, which is more weight to carry, which could also lead to more leg injuries. While obviously a horse and a human have different physiology, sports fans have seen an increase in muscle strains, tears, and pulls among our more heavily muscled athletes in recent years---injuries that weren\'t as common until the average football or baseball player carried 20% more body weight in muscle than they used to. So I don\'t think steroids are keeping horses from breaking down---they\'re helping unsound horses to keep racing, which leaves them more vulnerable to breakdowns.