No evidence that cracking knuckles causes arthritis
It has been a long-held myth that cracking knuckles could cause arthritis.
Scientists say there is no evidence of this at present.
Professor Philip Conaghan of the academic unit of musculoskeletal medicine at the University of Leeds:
We have no evidence that cracking your knuckles causes arthritis in the long term: there simply haven’t been good studies to make a decision about this
Knuckles are lubricated by synovial fluid, a yolk-like substance that reduces friction between the bones, easing movement. Cracking happens when the joints are stretched to the point that bubbles of dissolved gases are formed, which then pop. Once a knuckle is cracked, it takes about 15 minutes for the gases to reform, according to Spectator Health.
So in essence the whole knuckles myth is the design of old wives who wanted to make sure their kids didn’t get carried away making noise at night. Or just a bunch weird dudes who found their girlfriends cracking knuckles annoying so they just added this to things-my-bae-is-not-allowed-to-do.