“It’s extremely common for joints to crack, pop and snap,” Boutin said. “We were interested in pursuing this study because there’s a raging debate about whether the knuckle-cracking sound results from a bubble popping in the joint or from a bubble being created in the joint.” Subsequently, the professor began his ambitious experiment with the help of 40 adult patients.
Aged between 18 and 63, the patients were comprised of 23 men and 17 women, but the differences didn’t end there. Of the 40 individuals, 30 were habitual knuckle crackers while the remaining ten were not. Boutin revealed that some of those patients had never cracked their knuckles willfully, while others had done so frequently for 40 years.