Ray Allen was sore from bone spurs for about half a season after his surgery. I know the injury is in a different location, but it wouldn't shock me if KG experiences something similar.
However, the important thing is that the soreness is a heck of a lot less than it was when playing with the bone spurs. As KG said:
I'm almost 100 percent going forward. The best thing about it is I'm playing without any pain, which is something I haven't had in quite some time."