Losing control of the bike and hitting the ground is the most common mechanism of injury for bicyclists.

Losing control of the bike and hitting the ground is the most common mechanism of injury for bicyclists (50%). 29% of bicycling injuries involve colliding with an obstacle. 15.3% of bicycling injuries involve a motor vehicle.

Bicyclist not wearing helmets were 14.3 times more likely to die in bike crash than those wearing a helmet. Wearing a helmet is associated with a 93% reduction in the risk of fatality in a bicycling accident.

Experienced bicyclist suffer injuries as well as inexperienced cyclists. 36% of injuries involve cyclists who ride in excess of 50 miles weekly.

Source: https://www.drdavidgeier.com/shocking-statistics-bicycle-injuries/