I'd say there's definitely a knack to being a good orthopedic surgeon, just like there is to any other profession. Some surgeons, though, do seem to have consistently better outcomes than others. I'm not sure whether it's because they are willing to do more than the average surgeon, do less than the average surgeon, or what. But I would do research on patient outcomes before I chose an orthopedic surgeon, for sure.
In general, I'd want someone who has done hundreds of similar procedures every year, as opposed to someone who has done five or six a year. You want someone with a lot of practice.