article at Mom's Team on how to prevent overuse injuries. According to the National Athletic Trainers Association, 50% of youth sports injuries are caused by overuse / repetitive stress. Their top five ways to prevent such injuries are:
1. Education and supervision;
2. Pre-participation physical exams;
3. Participation limits;
4. Training and conditioning; and
5. Delayed specialization.
Check out the article for all the details.