Home » academia » What Happens when Knuckles Crack?

What Happens when Knuckles Crack?

Adapted from: MDLinx and UC Davis

Recent research at UC Davis Health System looked into two questions about knuckle cracking: What causes the “crack” sound, and does it damage the hand? Ultrasound evaluations showed that the knuckle–cracking sound occurs when gas bubbles form in joints very quickly — faster than the blink of an eye. The study also suggests that the “crack” is caused by bubble forming, rather than bubble bursting.

Examinations by hand specialists found no problems in the joints of knuckle crackers, a finding that contradicts a previous study that suggested that knuckle cracking may cause joint swelling and weaken grip.

Author’s note: I personally used to crack my knuckles. My 8-years-old don does that now. I keep telling him not to do it, but- I guess- I do not have a good reason anymore…


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