Cracking Your Knuckles: Bad For You Or Just Annoying?

Here's a question for all of you:  How do you feel about people cracking or popping their knuckles?

Supposedly, it's bad for the knuckles and will cause arthritis, but in reality, that's an urban myth.

Really?

Yes, really.  It's an urban myth and completely untrue.  Cracking one's knuckles does not harm them or lead to arthritis.  There are decades of serious research and scientific study backing this up.

Here's a quick summary, high-school biology or anatomy class level.

In between each joint of our fingers is cartilage.  Surrounding the cartilage and the ends of the bone on either side is a fluid-filled sac, which lubricates the joint.

When the amount of pressure applied to the joint changes, gases in the sac can come out of the fluid and form bubbles.

And this doesn't just happen when popping knuckles.  If you scuba dive or know someone who does, you've probably head of "the bends", when a diver comes up to the surface too quickly.  It's the exact same thing as cracking knuckles, but at far larger and more dangerous scale.

What kind of research was done to study this?

Mostly, it was the kind where researchers track people who perform said action over a given period of time.

One doctor actually studied himself, cracking the knuckles on one hand but not the other every day for over 60 years.  He didn't find any significant difference.  His research won him the Ig Nobel Prize in 2009.

Side note:  If you aren't familiar, the Ig Nobel Prize is a humorous parody of the Nobel Prize, awarded for genuine scientific research that nevertheless tends to get a "Wait, what?" type of reaction when people hear about it.  For example, some of the 2025 winners include:

• A doctor who recorded the growth rate of a fingernail over a period of 35 years.  (Awarded posthumously)
• Experiments on whether eating teflon (the non-stick coating on pots and pans) is a good way to make people feel fuller without consuming more food.
• Research on the physics of pasta sauce.

For added humor, the awards are presented by people who have won the Nobel Prize.

OK, back on track.

Sorry, I couldn't resist the derail.

Any way, while cracking your knuckles may not have health consequences, that doesn't mean people don't find it rude or disgusting.

Which is probably where the urban myth came from.  People wanted to make someone else stop it, so came up with a vaguely plausible reason to make them want to stop.