Knuckle-cracking MRI: No arthritis, but a debate over why cracked joints make sounds (VIDEO).

Here's What Gives Cracking Knuckles Their Telltale Pop (Video)

Here's What Gives Cracking Knuckles Their Telltale Pop (Video)

Slate in motion.
April 25 2015 8:11 AM

Cracked

What really makes our knuckles pop.

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MRI footage of a researcher’s fingers from a new study shows what happens in the joints just as our knuckles are cracked. The apparent cause of the telltale pop didn’t quite conform to previous studies.

Jim Festante is an actor/writer in Los Angeles and regular video contributor to Slate. He is the author of the Image Comics miniseries The End Times of Bram and Ben.