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Johnny Knox wasn't the only Bear to go down at the end of last season.
It is no secret that injuries were a big reason that Chicago missed the playoffs last year. After Jay Cutler went down in Week 11, the Bears lost the next five games in a row. With only Caleb Hanie and Josh McCown to fill in, the entire offense turned to Matt Forte.
Unfortunately, Forte went down with an MCL sprain in Week 13, and he was lost for the season as well. Without Cutler or Forte in the lineup, the offense came to a halt.
Johnny Knox went down in Week 15, and his injury was so severe that he may miss the majority of this season as well. Devin Hester was limited for almost the entire second half of the season due to an ankle injury that he sustained against Philadelphia.
While Chicago added depth at most of their key positions, they need their starters to stay healthy if they hope to compete with Green Bay and Detroit down the stretch. Four of Chicago's last six games this season are against division opponents, and three of their last four games are on the road.
Combine that with the downside of an early bye week, and the Bears are going to have a hard time staying at full strength when they need it the most.