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Why Do Your Joints Crack?

Story at-a-glance -

  • The sound of joints “popping” comes from a gas-filled cavity (i.e. bubble) forming in your joint
  • When you “crack” your knuckles it expands the space between your bones, creating negative pressure that draws synovial fluid into the new gap
  • This influx of synovial fluid is what causes the popping sound and feeling when you crack a knuckle

By Dr. Mercola

In the 1970s, research was published showing that the sound your joints make when “cracked” is due to the popping of bubbles in the fluid between the joint. New research published in PLOS One suggests this long-held theory may be wrong.


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