In every issue of WebMD the Magazine, we ask experts to answer readers' questions about a wide range of topics, including some of the oldest -- and most cherished -- medical myths out there. For our October 2011 issue, we asked Dimitrios Pappas, MD, assistant professor of medicine at Columbia University's College of Physicians and Surgeons, about the long-term effects of one popular childhood activity: knuckle cracking.
Q: My 10-year-old son cracks his knuckles. Is it true that it causes arthritis?
If you're making decisions about arthritis pain relief, here are questions you may want to ask your doctor:
1. What pain medication is best for me right now?
2. Does my family and medical history make me a good candidate for this drug?
3. Is it safe to take this drug every day?
4. How long will I need to take this medication? Is it a short-term or long-term treatment?
5. When can I expect to see improvement in my arthritis pain?
6. Will this pain medicine interact with other medications I'm...
Ten-year-old boys love to make noises with their body, so it's not surprising your son is intrigued with the sound of a good knuckle pop. But you can put your fears aside -- the idea that knuckle cracking leads to arthritis is FALSE.
"There have been a few studies on this,” Pappas says. "None of them shows any change in the occurrence of arthritis between people who habitually crack their knuckles and those who do not.”
But here's something cool you can tell your son: The "pop” that comes when you compress your knuckles isn't from bone snapping on bone. It happens because, as the bones are stretched apart, a gas bubble forms and then pops.
While such joint cracking doesn't lead to arthritis, medical journals do contain reports of people who injured their ligaments while cracking their knuckles. At least one study also found the grip of people who habitually crack their knuckles may weaken over the years.