Cracking your knuckles doesn't lead to arthritis. It is an old wives tale. there is some logic to it (wearing away the cartilege in the joints) howeve crackign your knuckles has never been proven to cause any arm. I crack my knuckles (usually only while i am writing for extended perionds of time, like an exam or paperwork) and my back (it just feels great after i've been sitting for a while.
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