It's now official. Jamaal Charles' injury is a torn ACL. He is out for the season.
MRI confirmed Jamaal Charles tore his ACL, per source.— Adam Schefter (@AdamSchefter) October 12, 2015
There was never really any doubt that it was a torn ACL because these doctors are too good but there was that sliver of hope.
As for the next step, I direct you to this article from former NFL team doctor David Chao:
If there is a silver lining, Charles has several factors that could work in his favor. First, this was the other knee as the left knee injured in 2011 was sparred. Second, he knows how to successfully rehab as he has been through this before. Athletes who tear their ACL have a 95% chance to return to the same level. Finally, an October injury gives 11 months before the next regular season game.
He'll be back. It won't be soon enough ... but he'll be back.