Steve Young – San Francisco 49ers
Steve Young truly left his mark as a NFL legend, he was named the NFL’s Most Valuable Player in 1992 and 1994, and was the MVP of Super Bowl XXIX. As of October 2015, Young is ranked fourth all-time, and is ranked highest among retired players. Plus, his 43 career rushing touchdowns are second among quarterbacks, while his 4,239 rushing yards ranks third all time. Sadly, his Hall of Fame career was constantly afflicted with severe concussions. Just before the 1999 season, Young actually had seven confirmed head injuries and when he suffered his eighth in the third week of the regular season, that was the end.
David Busst – Coventry City
David Busst’s career ending injury is still often considered as the most horrific in the history of the Premier League to date. As you then guessed, David Busst is a former professional footballer (soccer player) from England who played for Coventry City. In 1996, Busst collided with two Manchester United players which resulted in compound fractures in both bones of his lower right leg. The injuries were so gruesome that he nearly had to have his leg amputated! On top of that, Busst contracted the MRSA virus while he was in the hospital, and that, along with the 26 subsequent operations, forced him into retirement.