Why Knuckles Crack and What It Means

When you crack your knuckles, the space inside the joint expands. This sudden drop

in pressure causes gas bubbles to form and collapse — creating that cracking sound. The bubbles need

about 20 to 30 minutes to dissolve again, which is why you can’t crack the same knuckle twice

in a row. Despite the myth, studies show no direct link between knuckle cracking

and arthritis. But doing it excessively may weaken grip strength over time.