Geno Atkins goes down with knee injury, cannot return

Bengals defensive lineman Geno Atkins was forced to leave Thursday's game against the Dolphins in Week 9 with a knee injury, and he was unable to return after halftime. Atkins suffered the injury shortly before the two-minute warning, and had to be helped off the field and carted to the locker room.

The extent of the injury is not yet known.