When he was a child, Dr. Donald L. Unger’s mother warned him that if he keeps on cracking the knuckles he will get arthritis when he gets older.
So he decided to conduct an experiment. An experiment that lasted whole 60 years!
Dr. Unger cracked the knuckles on his left hand every single day for 60 years. He never cracked the knuckles on his right hand that entire time.
The result of his 60 year long experiment is THIS:
“There is not the slightest sign of arthritis in either hand.”
So there it is, the famous myth that cracking your knuckles causes arthritis is officially debunked by Dr. Unger. If anything, he proved his mother wrong.