Pop! Knuckle-cracking noise finally explained

April 16, 2015 12:04 PM

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Pop! Knuckle-cracking noise finally explained

What do you get when you combine the "Wayne Gretzky of knuckle cracking" with a magnetic resonance imaging (MRI) machine? The answer to a very old question, it turns out.

By using MRI to video-record knuckle cracking in action, researchers have discovered that the unsettling "pop" made by cracking one's knuckles results from the rapid creation of a cavity in the fluid inside the joints.

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