Chicago Bears linebacker Danny Trevathan will miss the rest of the season with a ruptured right patellar tendon.
Trevathan was injured in the fourth quarter of Sunday's 27-21 loss to the Tennessee Titans.
Coach John Fox said Trevathan will go on injured reserve. He becomes the team's 15th player on injured reserve, although it's possible cornerback Kyle Fuller or wide receiver Kevin White could come off of IR at some point this season.
Trevathan was blocked in the backfield behind the play, planted and suffered the knee injury.
Two years ago while with Denver, Trevathan suffered a season-ending knee injury that required surgery, but it was to his left knee.
John Timu replaced Trevathan in the lineup Sunday and likely will continue as his replacement.