Knees
 

I have had both knees replaced, one in 2009 and the other in 2011. I could not be happier. The key is doing the physical therapy, which cannot be emphasized enough. Both times I was golfing 8 weeks after the surgery. My key was doing the PT before the surgery too, to strengthen the leg, as much as the pain allowed. I was walking normally within a week after each surgery, and without any needed assistance, although cane usage was recommended for outdoor walking by the therapist, for stability only. (I started PT the morning after surgery). I exercised as much as the doctor/therapist recommended, and it paid off.
(I had the surgery in Pittsburgh, so the surgeon's name would not help you). Good luck.