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12/02/2001 Entry: "2-Dec-2001 -- What makes the sound when we crack our knuckles?"

What makes the sound when we crack our knuckles? (Scientific American) -- "If you take an x-ray of the joint after cracking, you can see a gas bubble inside the joint. This gas increases the joint volume by 15 to 20 percent; it consists mostly (about 80 percent) of carbon dioxide. The joint cannot be cracked again until the gases have dissolved back into the synovial fluid, which explains why you cannot crack the same knuckle repeatedly."

Replies: 1 comment

Scientific American: Ask the Experts!

Posted by John S. Rhodes @ 12/02/2001 01:15 AM EST

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