25 million American children can not be wrong.
Injuries occur for three main reasons.
First, because parents push their children past their natural ability level, thus it causes injury to the over worked body parts. Second, an accident occurs such as a turned ankle or a ball taking a bad bounce and hitting a player. The third, and most common reason, a coach teaches a player the wrong way to perform specific task. For example, when I was 12 years old, my baseball coach taught me the wrong way to throw a curve ball. After repeatedly throwing the wrong way, I tore a ligament in my right elbow.