So you come to see the Chiropractor, you’ve been putting up with that stubborn low back pain for a few weeks. As soon as the Dr. comes in and starts preforming your adjustment all of a sudden you hear this little “pop” or “crack.” Yikes, you think, what was that? Did he/she break my bones? You would be surprised how often we get asked in our office whether that crack you heard was a good or bad thing. Some people say that its a bad thing, that it’s your bones weakening or even breaking. Others say it’s a good thing, that unless you get that sound you didn’t have a good adjustment. Both are totally false. That cracking sound isn’t a sign of how well you adjustment went, nor it is your bones being broken.
That cracking or popping sound you hear during your adjustment is the release of a gas bubble between the joints. The joints in your body have fluid in them which lubricates and supplies nutrients to the joints and other parts of your body. When pressure on the same being treated (or an adjustment being preformed) is increased it makes that popping sound (much like when you open a can of soda pop). The air-tight, and fluid filled joint is separated the gas is released creating that popping sound. The sound you hear is no indication of a successful adjustment, many adjustments are successful with the absence of that noise.
some information in this blog post is found on the ACA website as well as proactivewc website