On a per capita basis, the very first marathon run had the most injuries.
Pheidippides collapsed and died. As he was the sole runner, this represents 100% mortality for that particular event.
A more contemporary answer most likely cannot be verified due to the various privacy laws.
Foot injuries are very common in marathon runners. Most professional runners take preventive action to limit the foot injuries. However, running can be stressful on the foot, knees and thighs and causes inflammatory injuries easily.
The most common dance injuries are ankles and leg injuries
Dubai Marathon$250K for the winner
London Marathon, with over 40.000 participants
Intentional injuries,Unintention injuries
The New York City Marathon, which is also the largest annual marathon in terms of participants.
Most injuries in a tornado are caused by flying debris.
The five marathon "majors" are Boston, Berlin, Chicago, London and New York. Other, but by no means an exaustive list, marathons that have large participation include the Marine Corp Marathon, LA Marathon and the Paris Marathon.
A knee injury or a heart injury & a neck injury
One can find a list of marathon sports on the Wikipedia page titled Marathon. The most common marathon sport is long distance running which also includes the wheelchair division.
Due to the terrain being mostly downhill the half-marathon in is considered the most fun in America.
Most deaths and injuries in a tornado are the result of flying debris.