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It most likely comes from a forseful twist of the arm!!

To add to that: it's caused by an extreme muscle contraction, in other words it's actually your arm muscles that break you upper arm bone! the break curves around the bone, hence the name. also known as "ball thrower's fracture". it's a relatively rare type of injury, which i unfortunately have at the moment. i tripped over a brick walkway and landed on my shoulder on the grass. my muscles tensed up to protect me but ironically did so so severely that my arm broke! from personal experience i can add that it's extremely painful and uncomfortable, esp because it's my right arm and i am a jeweler.

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12y ago
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Q: What causes a spiral fracture of the humerus?
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