Whether you crack your knuckles by pulling on each finger, making a fist or bending your fingers backwards, somebody probably has been telling you that cracking your joints leads to arthritis.
The popping sound you hear when you crack your knuckles is just a release of gas bubbles from synovial fluid, a “lubricant-like substance” found around the joints. In contrast, the “crack” you hear from your knees when you stand up too fast is tendon moving over muscle and bone.
As for the claim that knuckle-cracking can cause arthritis, a study conducted by one researcher, Donald Unger, who cracked his knuckles on just one hand for 60 years. He concluded that neither hand was more arthritic than the other.
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