ACL tears are no longer career-ending injuries the way they once were back a few decades ago; however, it can still take around 6-9 months to return to play even with modern reconstructive techniques.
A lot of people think that track and field is a sport that is solely based on God-given speed, endurance, and strength when compared to more 'complex' sports. However, it is exactly the opposite.
There are several theories as to why this may be the case, some of which may not be so obvious.
A lot of the injuries and ailments that docs have treated were things that one would expect such as muscle cramps, ankle sprains, groin strains, and tendonitis. However, there are several injuries, both minor and severe, that one may not expect to see in the medical treatment tent of a marathon.