Some do it out of habit, others just to stretch their fingers, others crunch before starting an important task … The reasons, in general, are not particularly important, the main thing is the feeling of relief and flexibility in the fingers after you crunch your knuckles well!
You have probably been warned more than once that the habit of crunching your knuckles will inevitably lead to arthritis in old age. Well, quite a logical statement …
Many people believe that the crackling sound when kneading fingers comes from rubbing joints against each other. We have good news: friction has nothing to do with the nature of these clicks.
Between each of our joints is a synovial fluid that has the consistency of an egg white. It acts as a lubricant that keeps the joints moving. It used to be thought that the source of the sound was the bursting bubbles of gas (carbon dioxide) formed in this liquid.
Recent studies using modern X-ray equipment have shown that sound is generated in the synovial fluid due to the vacuum generated by sudden movement of the joints, but not by friction.
After analyzing the experiment, which lasted 5 years, the American Council of Family Medicine concluded that there is no connection between kneading fingers and the development of arthritis. Later, scientists added that this disease can appear as a result of hard physical labor and monotonous, constantly repetitive movements.
Of course, not a single bad habit (yes, knuckle crunching refers to such) does not pass without a trace. Constant snapping of your fingers can reduce your grip and damage your ligaments.
Among other things, this sound can be annoying to others. So crunch with care and better alone … or use alternative arm stretches.