Very interesting. In my "old age" (38 next month) I've found that my ankles and knees have begun popping or cracking with regularity. I can rotate my right foot in a circular motion and it will pop just below the top of the ankle on every single downstroke no matter how many times I do it. My knees have begun popping every time I stand up and usually when I stretch them out under a desk or table. Five years ago this didn't happen, and I'm actually more active today than I was back then.
I've often wondered if the "gas bubble" theory was only partially correct, as there are different kinds of pops and cracks with different sounds and sensations (including pain).
I've often wondered if the "gas bubble" theory was only partially correct, as there are different kinds of pops and cracks with different sounds and sensations (including pain).