The truth is that there is always a chance of injury while using any kind of ride-on toy.  A fall on a hard surface from a scooter can cause fractures or bruises. However, it's worth noting that scooters are, by far, the most popular ride-on toy, and youngsters often spend more time on them than any other vehicle.  Wearing shoulder and knee pads and a helmet will help a child avoid serious injuries in case of falling off a scooter.