When a bone breaks or cracks, the injury is called a fracture. The leg has three bones that can fracture - the femur (the thighbone) or the tibia and fibula in the lower leg. When a crack or break involves the knobby end portions of these bones that are part of the hip, knee and ankle joints, the fracture is more complicated. This article describes only fractures of the straight shafts of the three long leg bones.
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