Some people hate the sound of cracking knuckles.
While other people will crack their knuckles up to 20 times a day.
25-45% of people crack their knuckles out of habit.
So why do knuckles crack and pop and what causes the sound that so many people hate?
That's what we'll find out on today's episode.
You probably already know what a joint is.
A joint is where two bones meet.
Your finger joints are in a capsule called the synovial capsule
which contains synovial fluid.
The synovial fluid lubricates your joint and makes it easier to move your fingers.
Inside the synovial fluid, there are dissolved gases.
When you pull your finger, you stretch the joint and reduce the synovial pressure.
This allows the dissolved gases in the synovial fluid to come together and form a cavity or
bubble.
The formation of this bubble is what causes the knuckle-cracking sound.
To crack your knuckle again, you'll have to wait about twenty minutes for the gases to
redissolve into the synovial fluid.
"What was that?
What did you say to me?
What did you say to me?"
"I'm so- I'm so sorry.
Please forgive me.
Please forgive me.
I won't do it again.
I'm sorry.
"I'll show you sorry."
*knuckles cracking*
"You know cracking your knuckles will give you arthritis?"
"No.
That's a myth."
"Yes, it will.
Everybody knows that.
It's common knowledge."
"No, cracking your knuckles doesn't cause the cartilage damage to give you arthritis."
"Yes, it will.
Ask anybody, cracking your knuckles gives you arthritis.
It's gonna hurt you when you're sixty."
"Oh, I'll show you what hurts."
"I didn't mean it.
It won't give you arthritis.
Please!"
Dr Donald Unger wanted to figure out if that was really true.
So he spent the next 60 years cracking the knuckles on his left hand every single day,
but not on his right hand.
60 years later, he did not develop arthritis, but what he did get was the
Ig Nobel prize in Medicine in 2009.
Does that mean it's safe to crack your knuckles?
Well, not completely.
Cracking your knuckles still leads to a weakened hand grip, hand swelling, and functional hand
impairment.
But it doesn't lead to arthritis.
Thanks for watching this video.
If you want to learn more about what happens when you crack your knuckles, go to pensivity.net/knuckle-cracking
and don't forget to subscribe.
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