The cracking sound in the knuckles is caused by the bones moving apart and forming a gas bubble - the sound is the bubble bursting. It is quite common to hear someone warning a knuckle cracker that they will get arthritis, but the worst that can happen to a compulsive-cracker is that their fingers joints may weaken over time. Arthritis is caused by a variety of things (Such as crystal formations in the case of gout) - but knuckle cracking isn't one of them.
I am just about to post the same message on my blog after hearing the advice from a Chiropractor
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