Explain the cries when breaking the knuckle joint

The knuckle joint causes a sound due to the rapid formation of an empty cavity or air bubbles in the liquid filling the space between joints.

According to Business Insider, researchers at the University of Alberta, Canada, in April 2015 used magnetic resonance imaging (MRI) to observe what happens when a knuckle is broken over a period of less than 310 milliseconds. seconds.

Knuckle knuckle is a habit of many people.(Photo: Wikihow).

The results show that the sound produced by breaking the knuckle joint is due to the rapid formation of an empty cavity filled with gas in the synovial fluid.Synovial fluid is a concentrated liquid that fills the space between joints in the human body.

"When the joint surface suddenly separates, there is not much liquid to fill the growing volume between the joints. Hence an empty cavity forms and this process produces sound," said Greg Kawchuk, professor at Department of Rehabilitation, University of Alberta, said.

In December 2015, a team of radiologists used ultrasound to further investigate this issue. Ultrasound meters can record information faster than magnetic resonance imaging (MRI) devices about 50-100 times.

The team found that the change in pressure associated with the bubbles in the joint fluid caused the sound when breaking the knuckle joint. Researchers have yet to find scientific evidence of a link between knuckle joint and arthritis and other health problems.