Manning missed the entire 2011 season with a damaged nerve that caused weakness in his right arm and required multiple neck surgeries, including a single-level fusion in September. He has brushed off questions about retirement, insisting that - after parting ways with the Indianapolis Colts on Wednesday - he still wants to play.
And there's no risk to him doing so, say several doctors in the field who have not examined Manning. Dr. Robert Watkins, Manning's surgeon, is not commenting on the quarterback, his office said Thursday.
Manning had at least two procedures between February 2010 and September 2011 to relieve pressure on a pinched nerve, the cause of the weakness in his throwing arm. When those didn't work, Watkins did the fusion, removing the troublesome soft disk tissue between two vertebrae and fusing the bones together.
The fusion normally takes four to six months to heal and, much like any other broken bone, it becomes even stronger afterward. But just as someone who tries playing with a still-broken arm risks additional injury, so did Manning if he'd returned before the fusion was solid.
But Manning was "working with the best," Bray said, and there's no way Watkins would have allowed the quarterback to play without being certain the fusion had healed. Watkins announced Feb. 2 that he had cleared Manning to play football again.
"In the field of spine surgery and professional athletes, we have a fairly strong consensus that if you have a one-level cervical fusion, you can recover and go back and safely play," said Dr. William Tobler, a neurosurgeon at the Mayfield Clinic in Cincinnati who has done four fusions on NFL players, including four-time Pro Bowl linebacker Chris Spielman, all of whom returned to the field.
"If the fusion heals, the neck is stable so, presumably, you can take all the hitting and impact."
Then it's a matter of the nerve regenerating.