Meet Vincent the cat. As you might have noticed, he has a pair of prosthetic hind legs.
When he was adopted as a kitten Vincent was missing his back legs from the mid-tibia down.
To help Vincent live his best life his owner, Cindy Jones, took him to see the vet.
Vincent is one of only about 25 animals in the world who've ever had surgery like this, says Bergh.
Because of the nature of his injuries, Vincent's titanium-alloy implants have to go inside his bones and come out through the skin.
"The first time I saw him after surgery, it was scary, I'll be honest," Jones said in a video released by Iowa State University. "You don't normally see metal things poking out of your cat."