Do you know if he just had fusion of the vertabrae, or did he need rods and screws to go along with it? He said he's feeling fine now, and admits he came back too early after earlier back procedures and his knee operation(s). I just hope he plays within his limits for the rest of his career. I might not like him as a person, but he's amazing to watch playing the game, probably like no other ever has.
I'm no doctor but I did stay at a Holiday Inn Express last night...
Tiger had an ALIF, Anterior Lumbar Interbody Fusion, where a spacer was inserted between his lumbosacral joint (L-5/S-1). Instead of rods and pins I believe they took a piece of bone from his hip, inserted that between the two vertebrae, then allowed that to fuse the two bones together, essentially creating one big bone. This relieves all the pressure on the nerves, eliminating all the back and leg pain he was experiencing. When Tiger asked his doctor how long this pain relief would last, the doc said "for the rest of your life."
Tiger is only the second professional golfer to ever have this surgery, the other being Dudley Hart a few years ago. Tiger made a (joking) comment recently that he's come back so strong and pain-free that several other pros asked him where and when they can have this surgery performed.
It sounds like the people hoping Tiger's back takes him out of he game again are going to be disappointed.