Dustin Keller

An injured Dustin Keller#81 of the Miami Dolphins is carted off the field as Houston Texans safety D.J. Swearinger #36 speaks with an official during a preseason game at Reliant Stadium on August 17, 2013 in Houston, Texas. (Scott Halleran/Getty Images)

Daily Madden: The Confusion Over NFL Tackling Rules

Miami Dolphins tight end Dustin Keller suffered a serious injury when he was hit in the knees following a reception in a game against the Houston Texans. The player who hit him, Texan safety D.J. Swearinger, suggested rule changes outlawing hits to the head have forced defenders to target the knees when tackling.