Why Do Knuckles Crack!

Damn just cracked another one, anyways I finally found an explanation we can all deal with! Is it ever gonna stop?

Dear Martha,
Like many people, I have a bad habit of cracking my knuckles and consequently annoying others around me with the sound. Just what IS that sound made from though? I know I'm not really "cracking" the knuckles. I've also heard that this will cause arthritis in later years. Is this true?
--Matt, the nervous noisemaker Read more...