barbaro recovery

[Rupert Pupkin]

I have a question that I have been asking ever since the injury but nobody has given me an answer. If the worst case scenario happens and they can't save the leg, why do they have to put him down? Why can't they try giving him a prosthetic leg? There have been horses that got prosthetic legs and did fine. There was a horse in California named Boitron and I believe he even stood at stud with a prosthetic leg. I believe it was a back leg that he had lost. Why isn't a prosthetic leg an option for Barbaro?