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Mostly the elderly, sometimes genetically or at birth. Contrary to popular belief, cracking one's knuckles does not increase susceptibility to Arthritis.

References:

- Castellanos J. Axelrod D. "Effect of habitual knuckle cracking on hand function." Annals of the Rheumatic Diseases. 49(5):308-9, 1990

- Mirsky, Steve (December 2009). "Crack Research: Good news about knuckle cracking.". Scientific American.

- Brodeur R: "The audible release associated with joint manipulation." Journal of Manipulative & Physiological Therapeutics. 18(3):155-64, 1995

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13y ago

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