Why do we have kneecaps on our legs but no “armcaps” on our arms?
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The knee cap is a sesamoid bone, your body has many of them, they form in tendons that are under high stress. Most people also have them in their thumb, big toe or back of the knee. So to answer your question, the tendons that play a role in the elbow aren’t stressed enough to generate a sesamoid bone, but other parts of the body are.
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