Shoulder occurred to me but Dad had both shoulders replaced since last June - one about a week before Thanksgiving.
He's a teacher, which would be a similar work load [we're not talking construction or anything] and was back at work in a couple weeks though he still doesn't have as much range of motion in the second one as he will eventually.
[He did the right shoulder in June so it would be mostly better by Aug then the left before Thanksgiving - since he's right handed, he was able to go back to work much faster.]
