I saw this live. He was tackled from behind by two players, and it appeared he not only came down on his right hip at an angle, but one of the players landed on it at the same time. One of the sideline reporters said he was screaming in pain as he was carted off.
It seems to me that he was stabilized in the locker room, then went straight to an ambulance. IMHO, I didn't hear about him being airlifted, but if he was, it was likely to transport him quickly to the hospital at Tuscaloosa. It's a state of the art facility that is also used by Alabama's sports teams, and where his records would be located, as well as some staff who would know him and his recent surgery. The hospital is about an hour by ambulance from Mississippi State's stadium, so a medivac helo would be useful.