The injury was a result of his fight with Forrest Griffin, Ortiz’s final fight for the UFC.

“My last surgery was 12 weeks ago. I had an ACL replacement,” said Ortiz.
“I was back at it in a month-and-a-half,” recounted Ortiz. “In a month-and-a-half, I was back at it, drilling again. My body heals super, super fast.”
Great. So if he loses or at least gets taken down by Rampage, he already has an excuse in line. I'm willing to bet he's not anywhere close to 100% by the fight.