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A femur fracture is a break in the thighbone. The femur can be fractured in three areas: the head/neck of the bone (e.g., the upper end, near the pelvis), the main shaft of the bone, or the lower end near the knee.
The femur is the longest and strongest bone in the body; because it is so strong, it usually takes a lot of force to break it. That’s why the most common causes of femur fracture are high-speed trauma, such as a motor vehicle or motorcycle accidents; a fall from a high place; an injury during extreme or contact sports; or a preexisting bone disease that weakens the bone, such as a tumor, Paget disease, bone cysts or osteoporosis.