Captions provided by CCTubes – Captioning the Internet! Arms and legs are pretty similar, from the amount of bones they have to the way their joints bend, but your legs have one thing your arms don’t: kneecaps. Ever wonder why?
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Sources:
http://www.aofas.org/footcaremd/conditions/ailments-of-the-big-toe/pages/sesamoiditis.aspx
https://www.howitworksdaily.com/question-of-the-day-why-do-we-have-a-kneecap-but-not-an-elbowcap/
http://yourfunctionalhealth.com/why-do-we-have-knee-caps-anyway/
http://www.arthritis.org/about-arthritis/where-it-hurts/elbow-pain/elbow-anatomy.php
Sophie Regnault and John R. Hutchinson, personal communication
