Why do we have kneecaps on our legs but no “armcaps” on our arms?
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Your elbow is basically a kneecap for your arms. Your ulna (forearm bone) has a curved end that basically looks like a knee cap when it attaches to your humerus (upepr arm bone). Your leg bones dont have this curved end so thats why we have the extra patella bone. Both serve the same purpose: it lets tendons stretch across them so you can convert a stretching linear force into a hinging motion.
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