Here is an article from the Atlantic. Several studies over the last few decades have concluded that this idea of knuckle cracking causing arthritis is another urban myth. A study last year by the Defense Dept using rays showed that knuckle crackers actually have slightly less finger arthritis. I always explain to my patients that the sound is just the collapse of gas bubbles in the lubricating fluid of the joint same as the sound made by carbonation when opening a can of soda pop :-)
http://www.theatlantic.com/health/archive/2012/05/cracking-your-knuckles-can-give-you-arthritis-science-or-myth/257851/#comments
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