What makes the sound when your back cracks while stretching, and why can’t the sound be made again until later when it needs to be cracked again?

Question

What makes the sound when your back cracks while stretching, and why can’t the sound be made again until later when it needs to be cracked again?

In: Biology

Answer 1

You can see a video of the bubbles forming in this [article](https://www.google.com/amp/s/www.wired.com/2015/04/watch-gross-mri-knuckle-cracking/amp).