Why do knuckles crack?

  • Knuckles
  • Cracking joints
  • Synovial fluid
  • Cavitation
Why do knuckles crack? zoom_in

Knuckles crack due to the formation and collapse of gas bubbles in the synovial fluid, a lubricant in the joints. This process is known as cavitation.

Sources & Related Links

en.wikipedia.org/wiki/Cracking_joints en.wikipedia.org/wiki/Synovial_fluid en.wikipedia.org/wiki/Cavitation
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