Lifehacker.com - Is It Bad If I Crack My Knuckles or Other Joints?
Nice shout out to Buzzy on LifeHacker.
"Consider this research noted by Dr. Amy Baxter, CEO of MMJ Labs (which makes a really cool pain blocker, Buzzy):
One really fun paper was what we call an 'n of 1' study - some guy (Dr. DL Unger) decided to only crack one hand his whole life, and see what happened. He then published the result. Bottom line: the cracked knuckle was bigger, but none the worse for wear."