Nose tackle Dusty Dvoracek will miss the final four games after rupturing his right biceps during a loss at Minnesota on Sunday night, his third season-ending injury in as many NFL seasons.
Dvoracek was injured on the opening drive and headed straight to the locker room.
"It's very hard for a guy like Dusty," coach Lovie Smith said Monday. "No one works harder than him. He's a tough guy. It's just unfortunate. If you look at how he injured his arm, it's a typical play that he's made plenty of times. It happens."
A third-round draft pick out of Oklahoma in 2006, Dvoracek missed his rookie season with a foot injury and ruptured his left anterior cruciate ligament in the opener against San Diego last year after earning the starting job. A hand injury then limited his offseason workouts, and a calf problem sidelined him early in training camp.
"It's disheartening knowing the adversity he's been through in the past," defensive tackle Tommie Harris said. "To keep continuing to go through this each year is very disheartening, especially having the season that he was having."
The injury to Dvoracek, who has 40 tackles, came a week after the Bears lost starting cornerback Nathan Vasher for the season with a broken hand. Rookie Marcus Harrison and Anthony Adams will get more work with Dvoracek injured.