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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.
Cracking joints. 1  Cracking finger joints (knuckles) --Cracking joints is the act of pulling bones apart to release air bubbles in the joints, which does not cause arthritis. 2  The sound of a knuckle being cracked (pictured: common knucklen joints) happens when joint manipulation in humans produce a sharp cracking or popping sound.