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Why Do Joints Pop and Crack?

July 7, 2014 by ActionPT

Do you crack your knuckles? Have you ever wondered why they make a popping, cracking, grinding, or snapping sound? SciShow explains what really causes those popping sounds your joints.

Hand X-Ray

The space between the joints increases, causing the gases dissolved in the synovial fluid to form microscopic bubbles.  These bubbles merge into large bubbles which then get popped by additional fluid which rushes in to fill the enlarged space.

Click here to watch a short video we found through the Richard Dawkins Foundation Web Site.

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