Help can cracking your knuckles cause damage to your joints?

No: There is a study that followed people who cracked their knuckles daily for 20 years vs people who didn't crack their knuckles. Serial x-rays of their hands were done over that time period. There was no difference in the likelihood of seeing arthritis on X-Rays between the groups. Although knuckle cracking may annoy people I think it's fun.....and it will not cause arthritis !!