Radiologists believe they've figured out why knuckles crack, and the good news is the source of the noise does no immediate harm to your hand.
Ultrasound readings of people cracking their knuckles reveals a bright flash, "like a firework exploding in the joint," said lead
researcher Dr. Robert Boutin, a professor of radiology at University of California, Davis Health System.
The flash comes from a gas bubble forming in the joint.
Source: nim.nih.gov
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