Cast fetish (or, abasiophilia if you want to get technical about it) is an attraction to casts or other orthopedic-related stuff (crutches, braces, etc.). In general it's a fetish that correlates pretty strongly with a few more "common" fetishes: foot fetish, bondage, dom/sub or caretaker.

For me, I find feet attractive and casted feet even more so, including how people deal with having a cast (having to move/do things differently, etc.). Overall there is a pretty wide spectrum of cast fetish, from people who like to see other people in casts, wear casts themselves, different parts of the body being casted, crutches, wheelchairs, braces, you name it.

I find that this is a pretty uncommon fetish topic around reddit so if it's something that intrigues you AMA!