aren't really helpful to fairly assess whether he is good or not. He treats more high profile people. So his outcomes may be talked about more often.
But consider this: the guy who fixed your knee the second time has most likely had surgeries he did that needed to be redone by him or another surgeon to be successful. The 1st surgeon could have possibly done the surgery again himself and had the same success.
There are way to many variables to judge like that. The best surgeons still have failures.