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In my last blog entry, I talked about noisy bones and joints. One other joint sound that I am often asked about is that well-known sound that is made when someone cracks their knuckles. Is this something good? Is it dangerous in any way?

We are not entirely sure what causes that noise, but most of us believe that the sound is elicited from small gas bubbles popping or bursting when under pressure. As you know some find it very easy to repetitively create the sound, and some even get addicted to doing this. While it may be annoying to those around us, and of great concern to many parents, most orthopedic surgeons believe that there is no harm in cracking your knuckles. I believe that an occasional knuckle crack is fine and can be combined with some simple stretches. I do not however suggest that you do this all day long especially if you are already hypermobile or loose jointed.

Another similar popping sensation occurs with spinal manipulation that is done by many chiropractors and/or osteopathic physicians. This noise is also not well understood, but is also believed to be due to small gas bubbles popping or bursting under pressure. It too is safe. Many cringe at the sound, but I welcome it when my back is adjusted. It seems to help loosen me up a little, even temporarily.

Crackin' Knuckles and More