Stress Fracture (cont.)
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Stress Fracture Causes
Most people think of a fracture as an event that occurs when a single, large force is placed upon a bone and it breaks. Stress fractures, however, are caused by repetitive forces placed upon a bone over time that are greater than the bone can bear, and overwhelm the ability of the bone to repair itself in time to absorb the next force.
Most commonly, stress fractures occur as an overuse injury in athletes or in military recruits, but they can occur any time the lower extremities of the body are overburdened. Bones of the feet, shin, thigh, and pelvis are at greatest risk for stress fractures.
Because of the increased potential for osteoporosis in women, they are twice as likely as men to sustain a stress fracture. As people age, theirbone mineral density decreases and places them at greater risk of stress fracture.
The risk of developing a stress fracture increases if the body design is unable to absorb the forces of walking, running, or jumping; or if the bone is in a weakened condition before the force is applied. Some examples include:
Stress fractures may occur because of overuse injuries and the failure to have adequate equipment to protect the body. Certain fractures are more sports-specific. Runners can develop stress fractures of the tibia, while tennis and basketball players more often injure the navicular bone in the foot. Poorly cushioned shoes can contribute to a stress fracture, as can training on excessively hard surfaces such as concrete.
Medically Reviewed by a Doctor on 6/11/2014
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