The reason why ankles pop or crack when stretched is largely a mystery, but a recent study claims it was due to the appearance of fluid bubbles.

If these bubbles collapse or collapse in a joint, the result is, according to a series of mathematical equations, cracking in a study published Thursday in the scientific journal Scientific Reports .

Three equations in the study aim to explain pressure variations, size variations of the bubbles, and how the bubble size might affect the sound.

Theories about the noise of ankle tears have been annoying scientists for years, who theorize that the tear comes from everything from tissue swirling to tightening of joint capsules to fluid bubbles, Live Science reports.

The idea that a bubble collapse causes the cracking noise was first introduced to the BBC in 1971. However, Reuters reports the first scientific study on ankle cracking published in 1947.

A 2015 study of ankle cracking using magnetic resonance imaging (MRI) found that sound is created when bubbles form, not when they burst, contradicting this latest study. Vineeth Chandran Suja, a graduate student at Stanford University behind the study Live Science told the BBC that the MRI findings may be flawed because the sound is too loud to come out of the formation and an MRI does It would have been quick enough to grasp what actually happened at the time of the noise.

Besides, despite what your grandmother says, there is no conclusive evidence of the risk of arthritis associated with ankle tears. But a study from the 90s combined the habit of hand swelling and lower grip strength.

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