I want to make a persona for warrior cats, but I want it to look like me. I have a crooked arm because I have a rare bone disorder, called multiple hereditary exostoses that made it grow in wrong as a side effect. For me IRL, it looks extreme enough to worry people once they notice, but it's minor enough that only people who see me often notice it. It rarely hurts, but it does make moving it in certain ways awkward. How would a cat get a crooked front leg? How could it affect their mobility?
Ah, the Warrior Cats. I grew up on those books.
I did a little bit of googling, and osteochondromas do actually occur in cats. From what I read, there isn’t a whole lot of research that states that the condition is hereditary, but the good news is that you’re working within a fictional universe, so there’s room for creative liberty.
You can read the studies I looked at here and here. The first one even includes X-rays, so you could compare it to your own radiographs and base your character on those!