The bones in children’s bodies are constantly undergoing a process of breakdown and rebuilding in response to physical stress. However, when the bone is subjected to more stress than it can recover from, it leads to a bone stress injury. In the initial stages, this results in a bone stress reaction, which can cause swelling or bruising in the bone but without any cracks. If the underlying injury is not addressed and high-impact activities like running, jumping, or intense sports continue, the bone can eventually crack, leading to a stress fracture. These injuries are particularly common in athletes who engage in repetitive high-stress activities, and without proper rest and recovery, they can worsen over time.
A stress fracture is an overuse injury that happens when the muscles are no longer able to absorb the added stress of repetitive impact. This overload is transferred to the bone, causing a tiny crack known as a stress fracture. Bone stress injuries happen when there’s a rapid increase in physical activity, whether it’s more frequent exercise, longer durations, or higher intensity. Children often experience these injuries 3 to 4 weeks into a new training program or sports season, when the body has not yet fully adapted to the new demands. However, even non-athletes kids are susceptible to bone stress injuries if they suddenly increase their activity levels. For instance, someone who is not used to regular walking might experience a stress injury after walking significantly more on vacation than they normally would.
Risk factors for bone stress injuries are categorized into modifiable and non-modifiable types. Modifiable risk factors, such as training techniques, footwear, or dietary habits, can be changed to reduce the risk. Non-modifiable factors include an individual’s age, bone density, or genetics, which cannot be controlled. These risk factors can further be divided into extrinsic factors (external forces, like an abrupt increase in physical activity or environmental conditions) and intrinsic factors (internal characteristics, like muscle fatigue, bone structure, or hormonal imbalances). Both types of risk factors play a role in the development of stress fractures.
In kids, stress fractures typically present with pain and tenderness in the affected bone, especially after physical activity. Swelling may also occur, and the child might have difficulty bearing weight or moving the injured limb. The pain often worsens with repetitive activities and improves with rest.
Bone stress injuries are treated by resting from painful activities and using alternative exercises, like swimming or cycling. If walking causes pain, using crutches or a supportive boot can relieve pressure on the bone. In more severe cases, surgery may be required, involving internal fixation with pins, screws, or rods. Typically, this hardware doesn’t need removal, but in some cases, it may be removed in an outpatient procedure after the bone heals.