## Flail Chest — Most Common Site **Key Point:** Flail chest occurs when three or more consecutive ribs are fractured in two or more places, creating a segment that moves independently (paradoxical motion). The anterolateral chest wall (ribs 4–8) is the most common site of injury. ### Anatomical Basis The anterolateral region is: - Most exposed to blunt trauma in motor vehicle collisions and crush injuries - Less protected by muscular attachments compared to the posterior thorax - The area of greatest compliance and mobility during breathing ### Clinical Presentation | Feature | Anterolateral Flail | Posterior Flail | Sternal Flail | | --- | --- | --- | --- | | Frequency | Most common (60–70%) | Less common | Rare | | Mechanism | Blunt anterior/lateral trauma | Direct posterior crush | High-energy anterior impact | | Visibility | Easily seen on inspection | May be occult | Associated with sternum fracture | | Associated injuries | Pulmonary contusion, hemothorax | Spinal injury risk | Cardiac injury risk | **Clinical Pearl:** The severity of flail chest depends more on the underlying pulmonary contusion and pain-related splinting than on the flail segment itself. Adequate analgesia and respiratory support are the cornerstones of management. **High-Yield:** In NEET PG, remember: anterolateral > posterior > sternal for flail chest location. The anterolateral position makes it the most common site in blunt trauma. ### Management Approach 1. Adequate pain control (epidural analgesia, intercostal nerve blocks, or multimodal analgesia) 2. Aggressive pulmonary hygiene and incentive spirometry 3. Positive pressure ventilation if respiratory failure develops 4. Avoid external stabilization (taping, strapping) — increases infection risk [cite:ATLS 10e Ch 4]
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