The little-known childhood injury that many parents are unaware of until it's too late

Trampolines have become a staple of backyard fun, offering children hours of active play. While most parents are aware of the risks of falls, collisions, and awkward landings, few know about a specific injury that can occur even when everything appears to be going smoothly.

The trampoline fracture is a unique injury that most often affects young children and can happen without a dramatic fall or obvious accident. A child may be happily jumping one moment and refusing to walk the next. Because the injury is not widely known outside medical circles, many families are caught off guard when it occurs.

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What Is a Trampoline Fracture?

A trampoline fracture is a break in the upper portion of the shinbone, known as the proximal tibia, located just below the knee. Unlike many childhood fractures that result from falls or direct impacts, this injury is typically caused by the forces generated during normal trampoline use.

The classic scenario involves a young child, usually 6 and under, sharing a trampoline with a heavier child, teenager, or adult. As the heavier jumper lands, the trampoline mat stretches downward and then rapidly rebounds upward. If the smaller child lands at the same moment, the upward force can travel through the leg and place significant stress on the developing bone, resulting in a fracture.

What makes this injury particularly surprising is that the child may never fall off the trampoline or collide with anyone. The fracture occurs because of the physics of the bouncing surface itself.

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Why Young Children Face the Greatest Risk

Children under the age of 6 are especially vulnerable to trampoline fractures, as reported by Science Direct. Their bones are still developing and are softer and more flexible than those of older children and adults.

Research has consistently shown that younger children experience a distinct pattern of trampoline-related injuries. While older children may suffer sprains, wrist fractures, or injuries from flips and stunts, preschool-aged children are more likely to sustain fractures around the knee, particularly proximal tibia fractures.

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According to the American Academy of Pediatrics, children younger than 6 account for a significant percentage of trampoline-related emergency department visits. They are also more likely to experience serious injuries such as fractures and dislocations compared with older children.

The Growing Numbers Behind Trampoline Injuries

Trampoline-related injuries have increased steadily over the past decade, and healthcare providers are seeing more cases involving young children.

Several studies have found that the incidence of pediatric trampoline-related fractures rose substantially between 2008 and 2017.

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Trampoline-related proximal tibia fractures increased by approximately 130% over 12 years. Fractures occur in nearly one-third of trampoline injuries treated in children. And multiple jumpers are involved in the vast majority of trampoline leg fractures, with some studies reporting rates as high as 80%.

The Symptoms Can Be Easy to Miss

One of the challenges with trampoline fractures is that symptoms may initially appear mild. Parents often expect a broken bone to cause severe swelling, obvious deformity, or intense pain. However, trampoline fractures frequently present much more subtly.

Common signs include refusing to stand or walk after trampoline use, limping, or favoring one leg. Complaints of pain near the knee, mild tenderness around the upper shin, little or no visible swelling, and minimal bruising.

In some cases, the fracture may be difficult to identify on initial X-rays, making it important for healthcare providers to understand how the injury occurred.

Why Jumping With Older Siblings Can Be Dangerous

Many families focus on trampoline safety features such as nets, padding, and protective enclosures. While these additions may reduce the risk of falls, they do not prevent trampoline fractures.

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The biggest risk factor is when multiple people jump at the same time. Studies consistently identify simultaneous jumping as one of the strongest predictors of proximal tibia fractures.

Even when parents are actively supervising, a child can sustain a fracture simply because they are bouncing alongside an older sibling or adult.

How Parents Can Reduce the Risk of Trampoline Injuries

Fortunately, several simple precautions can significantly lower the risk of trampoline injuries.

Experts recommend avoiding full-sized recreational trampolines for children younger than 6 years. Enforcing a strict one-jumper-at-a-time rule. Never allow young children to jump with older siblings, teenagers, or adults.

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Supervise trampoline use closely. Stopping activity immediately if a child complains of leg pain or begins limping. Seeking medical evaluation if a child refuses to walk after trampoline use.

These measures address the primary cause of trampoline fractures and can help prevent a painful injury before it occurs.