It's one of the most tragic things in football.
Seeing a world-class player carried out on a stretcher, not knowing when he will come back and wondering if he will ever be the same again. Injuries are a part of every sport. In football, an injury is especially tough to shake off. It's one of very few sports that require use of one body part almost 100 percent of the time. American football, basketball, baseball, etc. all require multiple body parts. But in football, if your legs aren't working, it destroys your career.
Here are the 12 players most affected by injury in their careers.