CM Punk was sparring in August at Roufusport. Things ended up on the ground and, in a scramble, he posted off his elbow with much of his body weight. His shoulder could not support the force and it popped.
At that moment, Punk thought for sure it was an injury that would need surgery.
"It was one of those pops where everybody in the room just turns and looks," Punk told Ariel Helwani on Monday's edition of The MMA Hour.
The former WWE star finished the round anyway and the session, too.