American Football is the one competitive sport that has the highest rate of injuries.
It has 12 times the injury rate of the next most injurious sport, basketball.
The most common injuries in both sports are knee-related.
Because of all the sudden stops and starts in high-friction shoes, two-thirds of all basketball injuries are to the knees.
In football, knees are involved in one-third of the injuries.
Despite protective equipment and rule changes to emphasize safety, injuries remain very common in football, and it is very rare for NFL quarterbacks to make it through an entire season without downtime due to injury.