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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.
Your joints can make a variety of sounds: popping, cracking, grinding, and snapping. The joints that crack are the knuckles, knees, ankles, back, and neck. There are different reasons why these joints sound off. 1  Escaping gases: Scientists explain that synovial fluid present in your joints acts as a lubricant.