Many years ago I shot a buck that was running through the woods just fine. He had a 12” spike on one side and a 3 inch spike on the other. The 3” spike had a little hook on the end, kind of like a can opener. When we skinned him out we learned that sometime along he broke his back. His rib cage was all twisted around (about a quarter turn on his body). Weirdest looking thing you ever did see. He ate well, though. By that I mean he was very tasty!
Our guess is he was hit by a car and broke his back, but survived and thrived after healing.