Researcher and bioengineer Gregory Kawchuk of the University of Alberta in Calgary, Canada, together with his team of scientists and physicians, confirmed the hypothesis that the cause of joint crunch is cavitation – the appearance of the smallest bubbles in the synovial fluid of the joint bag. They create a characteristic sound when a person decides to “crackle” with joints.
Confirm it was possible thanks to a modern magnetic resonance tomograph and special tubes, in which during the experiment placed and stretched fingers. “Subject” was made by the chiropractor from Nanaim, Jerome Fryer.
Scientists do not exclude that the formation of a crunch can be caused by other factors and they intend to continue research with the participation of other volunteers, including those unable to “crunch” joints.
The process of “crunching” a finger when stretching you can watch on the video: