According to The Institute for Sports Medicine Children rarely get tennis elbow. It is most common in adults, but can affect adolescents as well.
What is it?
Tennis elbow, or lateral epicondylitis, is an overuse injury the tendons that originate at the outside of the elbow. Tendons are like ropes which connect the ends of muscles to bone. The tendons affected in tennis elbow attach the muscles of the forearm to the humerus (upper arm bone).
Overuse of these forearm muscles causes fraying of the tendon. With tennis, the stress is greatest on the outer elbow of the dominant arm during a backhand swing. Incorrect grip size or swing mechanics can contribute to the injury.
Your child may have pain in the elbow during or after activity without significant swelling or redness. The pain may travel down the forearm. Pain usually begins gradually without one specific injury to the joint. The pain may improve with rest, but often returns when the activity (such as tennis) is resumed. Some individuals notice decreased grip strength on the affected arm.
For young athletes, attention to proper technique and equipment can help prevent tennis elbow. If they've have had tennis elbow in the past, continuing with stretching and eccentric forearm strengthening may prevent return of this condition. Tight muscles put more stress on the attached tendons and bones, putting these tissues at risk for injury.
Hopefully that helps.
And as always, if you suspect your child has any signs or symptoms of tennis elbow please consult a medical professional.