The immature bones of children are different from those of adults. The "growth plates" in children's bone do not finish closing until age 15-17 in boys and 13-15 in girls. When stressed, these plates are more susceptible to injury than the tendons and ligaments that support the joints. Ligaments tend to "give" before bones in adults.
Physicians warn repetitive overuse can cause inflammation of the growth plates. They advise parents to promote diverse physical activities for their children rather than one sport. This is especially important with individual sports such as running, gymnastics, and tennis, which require long hours of practice.
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