Q:

How much force does it take to break a leg?

A:

Quick Answer

A femur, which is the largest bone in the leg and the body as a whole, can be fractured with approximately 4000 newtons of energy, according to an article in SciFighting. The tibia and fibula, both smaller bones, require significantly less force.

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Full Answer

The human skeleton is surprisingly strong and, ounce-for-ounce, outperforms steel. Being thin and light, however, breaking a leg is relatively easy. A 2010 Wayne State University study calculated that a competitive mixed martial arts fighter can generate up to 5000 newtons in a single punch and 9000 newtons in a single kick, which is enough force to break a femur, a tibia, a fibula and just about every other part of the leg.

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