A stress fracture is a small crack in a bone, typically in the weight bearing bones of the leg and foot. Stress fractures are typically caused by overuse or repetative motions or are the result of loss in bone density.
A stress fracture is an overuse injury. It occurs when muscles become fatigued and are unable to absorb added shock. Eventually, the fatigued muscle transfers the overload of stress to the bone causing a tiny crack called a stress fracture.
Stress fractures can also be caused by loss in bone density called osteopenia or osteoporosis. These are insufficiency type fractures. They are more common in women later in life.
Stress fractures often are the result of increasing the amount or intensity of an activity too rapidly. They also can be caused by the impact of an unfamiliar surface (a tennis player who has switched surfaces from a soft clay court to a hard court); improper equipment (a runner using worn or less flexible shoes); and increased physical stress (a basketball player who has had a substantial increase in playing time).
Most stress fractures occur in the weightbearing bones of the lower leg and the foot. More than 50 percent of all stress fractures occur in the lower leg.
Studies have shown that athletes participating in tennis, track and field, gymnastics, and basketball are very susceptible to stress fractures. In all of these sports, the repetitive stress of the foot striking the ground can cause trauma. Without sufficient rest between workouts or competitions, an athlete is at risk for developing a stress fracture.
Stress fractures affect people of all ages who participate in repetitive sporting activities, like running. Medical studies have shown that female athletes seem to experience more stress fractures than their male counterparts. Many orthopaedic surgeons attribute this to a condition referred to as “the female athlete triad”: eating disorders (bulimia or anorexia), amenorrhea (infrequent menstrual cycle), and osteoporosis. As a female’s bone mass decreases, her chances of getting a stress fracture increase.
Pain with activity is the most common complaint with a stress fracture. This pain subsides with rest. There also is often swelling to the area
It is very important that during the medical examination the doctor evaluates the patient’s risk factors for stress fracture.
X-rays are commonly used to determine stress fracture. Sometimes, the stress fracture cannot be seen on regular x-rays or will not show up for several weeks after the pain starts. Occasionally, a computed topography (CT) scan or magnetic resonance imaging (MRI) will be necessary.
The most important treatment is rest. Individuals need to rest from the activity that caused the stress fracture, and engage in a pain-free activity during the six to eight weeks it takes most stress fractures to heal.
Immobilization is important as well and you may be put in a cast or a boot to control motion around the fracture site and prevent further fracture.
If the activity that caused the stress fracture is resumed too quickly, larger, harder-to-heal stress fractures can develop. Re-injury also could lead to chronic problems where the stress fracture might never heal properly.
Here are some tips developed by the American Academy of Orthopaedic Surgeons to help prevent stress fractures:
It is important to remember that if you recognize the symptoms early and treat them appropriately, you can return to sports at your normal playing level.
Stress fractures dont always show up on radiographs and at times can show up weeks later. The images abobe show a stress fracture of the 5th metatarsal of a patient at first visit, one month, and two months. The patient went on to completely heal the fracture without complication.