From the official Chicago Bears team website.

"Bears defensive tackle Dusty Dvoracek is out for the season after team doctors discovered and repaired a torn ACL in his right knee during arthroscopic surgery Friday morning."

Link here.

Looks like it's another wasted year for Dusty.  I guess at this point it's really best to just end up cutting him and making room on the roster rather than putting him on IR.  Too bad, if he could stay healthy, I think he'd be beneficial to the line.  I think he's had enough second chances though, and we should move on.