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Why crack ankle? Scientists finally have an answer for the loud tone



T The sweet liberation of the ankles has always astonished scientists. Over the years, scientists who explained cracking have pointed to "blisters" caused by rapid pressure changes in the ankle joints, but they have not been able to determine if the sound has anything to do with blisters or blisters . However, a study published in Scientific Reports on Thursday offers a new mathematical explanation that seems to calm the debate.

The new work suggests that loud crack people are not, as researchers argued in 1

971 the sound of bursting bubbles. Rather, researchers say, it is the sound of synovial fluid-filled vesicles .

"If one suddenly changes the pressure in this fluid as a result of increasing the distance between the knuckles, some of the gases in that fluid may develop into a blister," said Abdul Barakat, Ph.D., a professor of Hydrodynamics at the École Polytechnique in France and co-author of the study, on Guardian on Thursday. Working with Chandran Suja of the Stanford University's Faculty of Chemical Engineering, Barakat knew that to end the debate, they needed to find out what was actually going on in the joint.

  Before and after pictures Ankle cracking
Static imaging of the ankle joints before [Figure 1] and after [Figure 2] a cracking

He first looked at the imaging techniques available for Scientists who have connected the bubbles with the mysterious ankle-cracking sound. The most notable technique was introduced in 2015 by researchers from the University of Alberta, who concluded that cracking was caused by blistering. In their study, they scanned fingers drawn with an MRI to determine what is happening to the synovial fluid in ankle joints. After a series of finger movements in the name of science, they identified in the journal PLoS One the cause of the noise as a rapidly forming bladder within the joint.

The results were a strong lead, but Barakat noted that these imaging techniques could not provide the time resolution necessary to capture the high-speed dynamics of ankle cracking, and therefore could not determine whether collapsing bubbles could be behind the sound. So Barakat and his team developed a mathematical model to exclude this option

Earlier research into crack cracking showed the rapid formation of a blister in the ankle joint.

The new model takes into account three components: the change in pressure of the fluid as the knuckles move apart, the growth and collapse of the resulting blister that forms, and the way the pressure changes to an always satisfying (or for something agitating) cracking.

"What we demonstrate Here you do not need a complete collapse," said Barakat. His team found that even if a bubble collapsed only partially, the loud noise was still generated, suggesting that there was a separate process behind the noise. Now we know for sure: The crack is not caused by the bursting of the bubble, but by the bubble that forms from the jolt of a newly opened space.

This conclusion may not seem intuitive. While we can all imagine the sound of a soap bubble, it is not so easy to imagine why the formation of a bubble could make a sound. In an interview with the Guardian in 2015, the author of the PLoS One work, Greg Kawchuk, Ph.D., professor of rehabilitation medicine at the University of Alberta in Edmonton explained how it happened :

If you have ever washed glass plates, you know they are difficult to separate when wet. The water film between them creates a tension that must be overcome. It is similar to joints. When you pull on them, they resist first and then give in suddenly. "

Even if we do not blister, there is still a strategy for people to get the loudest bang out of their knuckles, Barakat's team offers some tips and highlights speed as the key factor." The faster Pulling it by the knuckle will increase the pressure, and the more likely it is that you will crack your ankle. "


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