September 21, 2023, 07:46:41 AM
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Topic: Cracking your knuckles!?  (Read 8872 times)

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Cracking your knuckles!?
« on: March 18, 2006, 10:07:10 PM »
I read somewhere that the sound you hear when u crack your knuckles is actually the sound of nitrogen gas bubbles bursting... is this true?!  ???

Offline P

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Re:Cracking your knuckles!?
« Reply #1 on: March 22, 2006, 10:08:20 AM »
I recently found out that a whip crack is due to a mini sonic boom as the whiplash causes the end of the whip to break the sound barrier. They slowed down a video and worked out the speed of the whip to be about 800 (ish) miles an hour.

wrt your question I'm afraid I don't know  -  I stand to be corrected but I think it is an unlikely explanation.
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Offline billnotgatez

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Re:Cracking your knuckles!?
« Reply #2 on: March 23, 2006, 06:16:25 PM »
It is actually your cartilage screaming in pain and pleading for mercy.
« Last Edit: March 23, 2006, 06:17:28 PM by billnotgatez »


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Re:Cracking your knuckles!?
« Reply #3 on: March 24, 2006, 07:14:34 PM »
The "sudden" movement of fluid in the joint (synovial) from one side to another causes that noise.  The sudden is relative to the normal movement of the fluid.

I have read no article that statistically links cracking knuckles to joint issues.

I have concluded that it does disgust my wife.

Offline Organishe

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Re: Cracking your knuckles!?
« Reply #4 on: May 18, 2006, 03:46:07 AM »
I've actually heard that the original explanation given is the correct one: in the process of popping your knuckles, the pressure within the joint capsule is lowered sufficiently to allow dissolved nitrogen/other gases in the synovial fluid to gassify, forming tiny bubbles that burst, creating the pop. It then takes a few minutes to redissolve, hence giving an explanation as to why it takes a few minutes before you can pop your knucle again.

So, I wouldn't say it is definite, but the majority of sources I've found do seem to agree on this explanation.


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