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How many pounds does it take to break a human bone?

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Depends on the bone. Heavy bones like the femur are extremely resistant to breaking, as is the skull. Smaller bones tend to be jointed in a way that lets them flex away from breaking forces. To actually put a number to this belongs more in the realm of the clinical laboratory, as the answer is always going to be somewhat abstract. I can take a section of femur (in the lab), deliver measured vertical force until it fractures, and all I've discovered is what would happen to someone who was attentive enough to fall in an exact vertical plane, and remain in that position as impact settled in. Not real-world at all. That said, some bones bear internal pressures of up to a ton or more. Spines bear a huge amount of shearing stress and concentrated/angualr weight.
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