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Yale-New Haven Hospital, New Haven, Connecticut, USA HealthLINK: Pediatrics
August 17, 2005

News this month
Increase in adult-type injuries among children and adolescents

Approximately 35 million children and young adults between the ages of 6 and 21 years participate in sports. Team sports are a great way for children to improve physical coordination, boost self esteem, maintain physical fitness and foster self-discipline.

Increasing numbers of young children are becoming sports-specific and training year-round to compete at a competitive level of play.

Unfortunately, increasing numbers of young children are becoming sports-specific and training year-round to compete at a competitive level of play, which puts them at risk for overuse injuries. In some cases, the damage is permanent, increasing the risk that the athletes—some of them as young as 9—will suffer crippling arthritis or require extensive surgery as they get older.

Overuse injuries from repetitive strain
Overuse injuries occur as a result of repetitive strain on tissues such as bone, tendon and ligaments, as well as specific muscle groups. Injury occurs when these tissues undergo sustained stress without enough time for recovery. Overuse injuries tend to occur in competitive sports: most commonly baseball, basketball, running, gymnastics and swimming.

“But just about any recreational activity that involves repetitive motion has the potential to cause an overuse injury, especially if kids are pushed too hard,” says Paul Stricker, MD, FAAP, a pediatric sports medicine specialist and a member of the executive committee of the American Academy of Pediatrics (AAP) Section on Sports Medicine and Fitness.

Overuse syndrome, playing the same sport constantly instead of participating in a variety of activities, can result in injuries such as swimmer's shoulder, Little League elbow, runner's knee, jumper's knee, tennis elbow, Achilles tendonitis and shin splints—conditions that can develop into chronic problems later in life.

Doctors in pediatric sports medicine are treating injuries in children that they once saw only in adults.

Young athletes
Media coverage of competition in sports such as gymnastics, figure skating, tennis, swimming and diving has attracted attention to a number of very talented but very young competitors. The demand to succeed creates a constant pressure for these athletes to train longer, harder, more intensely and, in some cases, at an earlier age. As the age of competitive athletes in sports such as gymnastics and tennis decreases, the pressure to succeed early in athletes' careers has intensified.

The New York Times reports that doctors in pediatric sports medicine are treating injuries in children that they once saw only in adults, blaming an over-aggressive culture of organized youth sports. According to the U.S. Consumer Product Safety Commission, more than 3.5 million related injuries in children under age 15 were treated in the U.S. in 2003.

Prevent overuse with conditioning and training
Most overuse injuries can be prevented with proper conditioning and training. The American Academy of Pediatrics recommends cross-training in moderation throughout the year to prevent any one area of the body from becoming overworked and stressed and to help maintain overall fitness levels.

Children should be encouraged to participate in sports at a level consistent with their abilities and interests. Pushing children beyond these limits is discouraged as is specialization in a single sport before adolescence.

Parents and coaches should be cautious when a young athlete has significant pain and should not encourage a child to “play through” the pain.

“Children and adolescents are predisposed to overuse injuries because of the relative weakness of their growing bones and the tightness of their ligaments, tendons and muscles during growth spurts,” said Dieter Lindskog, MD, pediatric orthopedist at Yale-New Haven Children's Hospital.

The American College of Sports Medicine estimates that 50 percent of overuse injuries in children and adolescents are preventable. Pre-participation screening, required by most schools, should be encouraged for all children involved in organized athletics. The pre-participation exam can detect condition that may limit participation or predispose an athlete to an injury and assess general health.

Educational campaign underway
The American Academy of Orthopedic Surgeons (AAOS) and the National Athletic Trainers' Association (NATA) launched a public service campaign in March to educate young athletes, parents, coaches and the media on how to prevent, treat and rehabilitate overuse injuries.

The Youth Sports Injuries public service campaign is a year-long campaign with advertisements featuring kids playing baseball that will appear in major magazines, newspapers and at airports with the provocative headline: “What will they have longer, their trophies or their injuries?”


Dieter Lindskog, MD portrait

Parents are key to prevention of overuse injuries

Youth sports are becoming increasingly popular among children and adolescents. Recent studies estimate that 30 to 50 percent of pediatric sports injuries are caused by overuse, with the frequency of injury equal among boys and girls. For older patients, the proportion of injuries that are due to overuse is even higher.

“Thirty to 50 percent of pediatric sports injuries are caused by overuse.”

Types of overuse injuries
Diagnosing overuse injuries as well as what causes them can be challenging. The three types of injuries we commonly see in our practice are:

  • Repetitive activity or micro trauma, caused by routine or normal stress to the bone without adequate recovery;
  • Growth plate injuries, or fractures, which, left untreated, can cause permanent damage and interfere with proper growth of the involved limb; and
  • Soft-tissue damage to muscles, ligaments and tendons.

Children more susceptible
Children who engage in sports are playing at a time when their bones, muscles, tendons and ligaments are still growing. Children's bone and soft tissues have mechanical properties that are different from what they will be as adults, making them more susceptible to injuries.

Unfortunately, it is not uncommon for athletes to “play through” their pain in an effort not to disappoint teammates, coaches and parents. Coaches and parents must learn to temper their desires to let children continue to play and instead seek early and appropriate care to prevent long-term consequences.

How much is too much?
A lot of controversy surrounds what people consider “overuse” or “excessive.” There have been limits on the number of innings Little League pitchers can pitch for many years. Now, however, many kids play for multiple teams in different leagues and it must be up to the parent to control the number of innings.

“Total training should increase no more than 10 percent at a time.”

Other controversies include weight training for prepubescent children. Reports have shown that younger adolescents can train safely and effectively, but is it really necessary to lift weights at age 12?

Despite scarce data about training progression and injury, gradual progression should be stressed. A general guide is the “10 percent rule:” Total training (intensity, frequency, duration, or any combination of these) should increase no more than 10 percent at a time.

Signs of excess
Because there are no set guidelines for what constitutes overtraining, parents, athletes and coaches need to be aware of possible warning signs that athletes are overtraining. These include:

  • Excessive use of over-the-counter pain medications
  • Changes in an athlete's performance or techniques
  • Psychosocial changes

Many athletes, including children, rely on the use of ice and over-the-counter anti-inflammatory medications such as Motrin ® and Advil ® immediately after exercise. However, long-term use of such remedies should raise concerns of overuse.

If pain or soreness causes changes in a child's gait, body mechanics or sport technique, this too, may suggest excessive use. Proper technique, such as throwing mechanics, is crucial, even at a young age, to prevent undue stress and limit overuse injuries.

Good coaching is important. Young athletes need to be instructed in their sports so they can participate properly and not excessively. A child's coach should be knowledgeable about proper training techniques, equipment and the unique physical, physiologic and emotional characteristics of young competitors. Encourage your child's sports league to have a certified athletic trainer at all practices and games to evaluate and treat injuries and advise on the need for further medical attention.

Ideally, children should participate in sports for one reason – to have fun!


Dr. Lindskog is an adult and pediatric orthopedist at Yale-New Haven Hospital and assistant professor of orthopaedics at the Yale University School of Medicine.

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