NFL Concussion Rules: Did League's New Emphasis on Helmet-to-Helmet Hits Inadvertently Cause Season-Ending Injury to Miami Dolphins Tight End Dustin Keller?

Miami Dolphins tight end Dustin Keller suffered a season-ending knee injury from a hit by Houston Texans safety D.J. Swearinger when Swearinger intentionally went low to avoid a helmet-to-helmet hit.