I spoke with my original surgeon on Tuesday and he doesn't think that the implant shifted, but that I aggravated a nerve. Apparently, it can take as long as 3-4 months for the sensation to return to normal.
He recommends that I leave it alone for now as long as it doesn't get any worse. If the discomfort continues into the Fall, then he says that we may want to consider removing the implant.
The x-rays look normal (confirmed by three surgeons) and the placement is good, so I think I'll just leave it be for now and hope that it goes away. As soon as it does, I'll post an update.
Has anyone experienced this type of thing before? Never knew you could damage or irritate a nerve out of nowhere.