... finger cracking causes arthritis?
I have always been told that I could develop arthritis over time, if I make my fingers crack. But is it really true? Many people crack their fingers as a kind of compulsive behaviour, while others are disgusted at the popping sound of the joints. Perhaps the myth that finger cracking causes arthritis originated as protection against the unpleasant sound. No scientific studies support the theory – and it's like to be harmless.
In a study from 2011, an American doctor, Kevin deWeber, compared X-rays of the hands of 215 elderly people, who had either been cracking their fingers regularly for several years or had never done so. His study produced no evidence of the behaviour being harmful. A not quite as scientific study was made by American doctor Donald Unger, who cracked the fingers of his left hand every day for 60 years, leaving the fingers of his right hand alone. Again, there was no evidence of the habit causing arthritis or other illnesses. On the other hand, the dedicated study earned him an lg Nobel Prize in medicine.
The sound of cracking fingers arises, when the fingers are overstretched one way or the other such as by subjecting them to pressure with the other hand or by stretching oneself with one's fingers crossed. The motion pulls the finger joints apart, so air molecules consisting of nitrogen and carbon dioxide are liberated into the joint fluid with a snap. The formation of the bubbles produce the characteristic sound. About 20 minutes after the gasses have been liberated, they are incorporated back into the joint fluid, and the fingers can crack again.
ED STRETCH NORMAL clearly show the cracking joint MRI scans of the the surrounding Air enters from bubble formation. the pressure. tissue, equalising A T R E B L A F O Y IT S R E V I N U