Interesting new study from the University of Alberta. Researchers used a motion MRI to visualize a finger joint while traction of the finger caused it to cavitate (commonly called cracking). This study disproved previous thought that the sound was caused by a gas bubble collapsing and showed that it was from the creation of the gas bubble. This is a natural phenomenon that also creates the sound when opening a can of soda pop or popping packing bubbles.
Studies have shown that this does not cause arthritis. In fact the most recent study showed that "knuckle crackers" had slight less finger arthritis than controls.
Did anyone previously think this was harmful?
Here's What Really Happens When You Crack Your Knuckles
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