Carwin had an MRI Monday and may face back surgery that would put him out indefinitely. Even without surgery, he will be out for the next two-to-three months.
From the post:
"In the end my family and manager are right. I owe myself, I owe my fans the best show I can give them. I need to get healthy. I am going to be speaking with the surgeon this week about the surgery. My thoughts are if the surgery fixes it why add 8-12 weeks of physical therapy, epidurals and traction if surgery may still be needed.
The good news is the doctors said I can work on my cardio (they must have seen my last fight lol) with this injury."
Carwin hasn't competed since losing to Brock Lesnar in a heavyweight title unification bout this past July.
This puts the UFC in a bind as the fight was expected to help PPV sales for a main event featuring Lightweight Champion Frankie Edgar vs. Gray Maynard.
While a Mir/Nelson fight has been discussed previously, the thought has been that Mir will take on Lesnar for a third time—a fight that would be a major money draw on PPV.