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Is joint-cracking harmful? No. Donald Unger was told by his mother that he'd get arthritis if he cracked his knuckles so he cracked his left knuckles every day for 60 years but never his right knuckles. He had no arthritis or any other problems in either hand and got a publication (D. L. Unger, "Does knuckle cracking lead to arthritis of the fingers?", ...


The exact mechanism is unclear. Here are some possible causes: rapid collapsing of cavities inside the joint [1]; rapid ligament stretching [1]; breaking of intra-articular adhesions [1]; escaping gases from synovial fluid [2]; movements of joints, tendons and ligaments [2]; mechanic interaction between rough surfaces [2], mostly in pathological situations ...

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