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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.
The grinding sound, also called crackling, rubbing, snapping, etc, is what is called benign crepitus. The actual cause of this type of crepitus in the knee is not known. It is sort of like the sound made when you crack you knuckles. Yes, there is a sound, but it does not cause any problems. Many people have crepitus in their knees.