Mack Strong
This NFL player spent his entire career in Seattle, which also means it ended there. Mack suffered a herniated disk during a game against the Steelers in the 2007-2008 season. Unfortunately, the trauma caused damage to the spinal cord.
Fortunately, Strong was not paralyzed in any way as a result of the injury, but due to the close call on his physical health, he decided to retire from the sport.
Trent McCleary
McCleary’s situation is unfortunate: he suffered a major eye injury in his first season of hockey, but he was able to recover and play again. He was hit in the throat by a hockey puck a year later.
He suffered a fractured larynx and a collapsed lung as a result of the collision, and despite his best efforts to return to the game later, the shortness of breath he experienced as a result of the injury made it impossible to properly condition himself for the sport.