Bones break for several reasons: overuse; a trauma, such as a fall or car wreck; or osteoporosis, a disease that weakens bones. Doctors treat fractures based on their type and severity. Some breaks are simple, requiring only stabilization by a splint or cast. Others need surgery. Treatment depends on the severity and type of fracture, but some cases may require stabilizing bones with pins, screws or plates. When a broken bone pierces the skin, both the fracture and the wound require medical attention. Simple breaks may heal in weeks; more complex ones may take months.