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When you crack your knuckles, you're actually doing more bursting than cracking. The popping noise you hear is caused by small bubbles bursting in your synovial fluid, a yolk-like substance that lubricates the areas between bones and reduces friction for ease of movement.
1 The sound of joints âpoppingâ comes from a gas-filled cavity (i.e. bubble) forming in your joint.  When you âcrackâ your knuckles it expands the space between your bones, creating negative pressure that draws synovial fluid into the new gap.