Redskins quarterback Robert Griffin III hits the turf after being sacked against the Cincinnati Bengals in Landover, Md., Sept. 23, 2012 (AP Photo/Alex Brandon)

Titans middle linebacker Colin McCarthy is lies on the ground after an injury against the Miami Dolphins, Nov. 11, 2012, in Miami. (AP Photo/Wilfredo Lee)

Falcons center Todd McClure is attended to by staff after an injury against the Cardinals, Nov. 18, 2012, in Atlanta. (AP Photo/John Bazemore)

Steelers running back Chris Rainey is carted off the field after an injury during the second half of an game against the Giants, Nov. 4, 2012, in East Rutherford, N.J. (AP Photo/Julio Cortez)

Eagles free safety Kurt Coleman grimaces as he is attended to by staff members during a game against the Cowboys, Dec. 2, 2012, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Giants tackle Sean Locklear is wheeled from the field after an injury against the Redskins in Landover, Md., Dec. 3, 2012. (AP Photo/Patrick Semansky)

Dolphins defensive end Olivier Vernon is attended to after an injury during the first half of a game against the Rams, Oct. 14, 2012 in Miami. (AP Photo/Lynne Sladky)

Buccaneers cornerback LeQuan Lewis is carted off the field after sustaining an injury during a punt return in the fourth quarter against the Broncos, Dec. 2, 2012, in Denver. (AP Photo/Joe Mahoney)

Titans tight end Jared Cook and referee Tony Corrente check on tackle David Stewart after Stewart broke his right leg against the Texans in Nashville, Tenn., Dec. 2, 2012. (AP Photo/Wade Payne)

Cowboys center Phil Costa is attended to after an injury against the Panthers, Oct. 21, 2012, in Charlotte, N.C. (AP Photo/Chuck Burton)

Cowboys’ Danny McCray, on ground, is assisted by staff after suffering an unknown injury against the Browns, Nov. 18, 2012, in Arlington, Texas. (AP Photo/Sharon Ellman)