Wednesday, April 29, 2015

MRI of Knuckle Cracking

Scientists have figured out what makes the sound when you crack your knuckles

Their conclusion:
Our data support the view that tribonucleation is the process which governs joint cracking. This process is characterized by rapid separation of surfaces with subsequent cavity formation, not bubble collapse as has been the prevailing viewpoint for more than a half century.
(Click through to see MRI images and video.)