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    When you 'crack' your knuckles, what actually produces the cracking sound?

    Question #24400. Asked by Carl. (Nov 19 02 2:21 PM)


    Gnomon

    		Some cracks are caused by bubbles of air in the fluid in your joints moving around. Others are caused by tendons being stretched and then suddenly snapping into a new position.

    Nov 19 02, 4:03 PM
    Kainantu

    		Gnomon is correct.
    If you want more detailed information on this
    from Raymond Brodeur in the Ergonomics Research Laboratory
    at Michigan State University,
    then go to this Scientific American site

    http://www.sciam.com/askexpert_question.cfm?articleID=000B823A-B223-1C71-9EB7809EC588F2D7 and catID=3 and topicID=12

    Nov 21 02, 7:25 AM

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