Brent, there are actually a few patients that have kyphotic conditions in their cervical spine. What I am not sure about is if these were defined clinically by the surgeon or the radiologist, or if the their were segments that exhibited kyphosis. And that does matter, no?!
Any way, I am doing admin clean-up in the outcome forum and came across Frank's outcome post. He had a 3 level in Florida (surprised? I was...) and he mentions kyphosis. He's helpful and accessible and also has extensive imaging pictures on his site:
Cervical C4-C7 ProDisc - Frank
If you talk to him, pls ask him to update or correct his post-op topic. I had to do some editing/guessing on his new hardware!