Define flail chest and its key complications that may require ventilation.

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Flail chest is defined by chest wall instability from two or more adjacent ribs fractured in at least two places, creating a segment that moves paradoxically—inhale pulls the segment inward while exhale pushes it outward. That paradoxical motion disrupts effective ventilation, increases the work of breathing, and is often accompanied by underlying lung contusion. The key complications that may require ventilation are respiratory failure due to insufficient ventilation and hypoxemia, plus infection risk such as pneumonia from poor airway clearance. Analgesia helps the patient take deep breaths and cough, while ventilatory support, often with positive-pressure ventilation, can stabilize the flail segment from within and improve lung expansion. The other descriptions don’t show the necessary chest-wall instability or paradoxical movement that defines flail chest, and thus don’t capture why ventilation might be needed.