All of those pieces of information have made their way to the media. But the entire result is a stew of concerns that has created a far more negative vibe in and around the Griffin camp than the pronouncements of optimism and quasi-guarantees that hell be good as new by September 2013.
Apart from the fact that theres no way to know how the ACL will rehab, the biggest concern, as the source explained it, is the damage to Griffins cartilage. With the ACL in the right knee now torn twice in less than four years, Griffin has lost enough cartilage in his knee to raise concerns about how much remains and how long it will last. Eventually, Griffin could be dealing with bone-on-bone contact, and the chronic pain that goes along with it.
And hes still only 22.
http://profootballtalk.nbcsports.com/2013/01/12/griffins-knee-creates-more-concern-than-advertised/