What happens when your ankles and knees crack?

Question

I recently had surgery on my ankle and have started walking again. I find when I stretch or move it, it cracks and pops a lot more then it ever did before. This doesn’t cause pain, and sometimes even feels nice, but what makes the noise?

In: 4417

Answer 1

But where does the gas go? If the bubbles pop, doesn’t the stuff in the bubble go somewhere?