Recently,
Canadian researchers decided to find out once and for all what causes
the sound when people crack their knuckles. In a study called
Real-Time Visualization of Joint Cavitation, they
aimed to challenge the long-held assumption of many that sounds emitted
during knuckle cracking were from the collapse of a bubble formed in
synovial fluid when the bones of the joint separated. Yet from the
result of the MRI the scientists were able to determine that "the
mechanism of joint cracking is related to cavity formation rather than
bubble collapse." There you have it. Another medical mystery put to
rest. (I can sense your relief from here.)
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