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Image of the Day: Cracking Cavity

An MRI video of cracking knuckles reveals that the popping sound comes from the formation of a small air bubble (the dark cavity on the upper right image) in the synovial fluid of the joint.

The Scientist Staff

PLOS ONE, KAWCHUK ET AL.

(See “Real-time visualization of joint cavitation,” PLOS ONE, 2015.)

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