We've poked around a bit via our network of sources, and we've concluded that there's something to this one. It's our understanding that Palmer is undergoing tests on the shoulder today.
It's the last thing the 8-6 Bengals need as they prepare to face the 8-6 Broncos on Sunday in Denver. The winner will be in great shape for a playoff spot; the loser will be battling with the likes of the Jaguars and the Steelers and the Jets and the Chiefs and the Titans and the Bills (the Bills?) for the six seed.
First I've heard of it, so we'll see later. (hat tip, Mile High Report)