Why Do Joints Pop And Crack?

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SciShow explains what really causes those popping sounds your joints make — fluid dynamics, people! — and what you should watch out for if you’re a habitual knuckle-popper.
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Sources:
http://www.scientificamerican.com/article/what-makes-the-sound-when/
http://cal.vet.upenn.edu/projects/saortho/chapter_86/86mast.htm
http://www.loc.gov/rr/scitech/mysteries/joint.html
http://health.howstuffworks.com/human-body/systems/musculoskeletal/question437.htm
http://www.hopkinsmedicine.org/healthlibrary/test_procedures/orthopaedic/joint_aspiration_92,P07680/
http://www.livescience.com/9729-knuckle-cracking-ig-nobel-prize.html
https://secure.flickr.com/photos/orijinal/4740214235

2 COMMENTS

  1. ‘Weaker grip strength’. That sounds like rubbish. While the first part about the mechanism and the cracking not being harmful is well explained the last part about weaker grip strength is not. Probably because it is not true and there is no evidence. Maybe it’s better to skip then, SciShow.

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