"One study was carried out by Dr Daniel Unger, who had cracked the knuckles on his left hand for 50 years. He then compared his left hand (with the cracked knuckles) and his right hand (with no
cracked knuckles). His left hand was no more arthritic than his right hand - but ‘one person' is a very small sample size. Another study looked at 300 people who had been cracking knuckle joints for 35 years. There were no extra cases of arthritis in the hands. They did have slightly swollen joints (which is no big deal). But the real surprise was that their hands were weaker - their grip strength was one-quarter as strong as it should have been! So cracking your knuckles won't bother you in the short term, but 35 years from now, you might not be able to open a jar of Vegemite!"
-Dr. Karl
I hate people that don't crack their knuckels