Steve-O broke both of his legs in a skateboarding accident.
The Jackass star was attempting a stunt in which he stood on top of a wooden structure that a car plowed through and while his first two attempts went well, a third try left him with a number of broken bones.
Steve, 42, explained on Instagram: "I broke my right ankle in three places, dislocated it, and broke my left heel."
He also shared a picture of himself in a hospital bed and wrote: "I really did a number on myself today. Apologies in advance for the images of my foot sticking out sideways - wish me luck in surgery!"