Combined bubble ring

Our bones are connected by ligaments, and joints are where bones are connected. Breaking a joint is actually stretching the joint to keep the bones away from each other. When the bone is stretched, the space in the joint will increase and the pressure in the joint will decrease. Knees, elbows and fingers contain a special liquid, which can reduce the friction between joints like lubricating oil.

The low pressure in the joint caused by bone stretching makes the gas in special liquid, such as carbon dioxide, quickly fill the newly expanded space in the joint and form bubbles. If the joint is stretched too far, the pressure in the joint will be too small, so that the bubble will burst, resulting in a click. Subsequently, it takes 15 to 30 minutes for these gases to dissolve into the special liquid again, which is why you can't break the joint again immediately.

Although there is no evidence that snapping joints can cause arthritis, it is believed that frequent stretching of joints may lead to decreased grip strength and joint tissue damage.