Anterior Cruciate Ligament (ACL) Injuries Have Become So Common In Modern-Day Sports That The Acronym "ACL" Is Heard Almost As Often As "NFL" And "NBA". An ACL Injury Is The Over-Stretching Or Tearing Of The ACL In The Knee. Sean Elliott (Basketball, San Antonio Spurs Philip Rivers (American Football, Quarterback, San Diego Chargers Logan Mankins (Football Guard, New England Patriots Mickey Mantle (Baseball, New York Yankees John Elway (Football Quarterback, Denver Broncos