The sounds we hear from the joints are due to our inflammatory processes that involve nitric oxide. Nitric oxide is a gas and has an extremely short life span. The sound we hear is from the reabsorption of the unbound gas that causes a shift in the synovial fluid. There are three
locations/types of nitric oxide, the one causing the popping noises is made from the inducible nitric oxide synthase which plays a role in the inflammatory process. NO acts as a free radical scavenger that destroys superoxide anion radicals through oxidation. This is the same oxidation that harms our body so NO is beneficial and can be harmful. When our superoxide di****ase levels decrease due to epigenetic shifts, more cellular and neuronal damage will occur. This shows up as a SOD2 mutation. Many of us have this issue.
It could be hypothesized that the muscular twitching that we often experience may be caused by a localized arginine deficiency. It would certainly warrant further study. From the literature,
"Stimulation of intestinal or anococcygeal nerves liberates NO, and the resultant muscle relaxation is blocked by arginine derivatives that inhibit NO synthesis."
www.pnas.org/content/87/4/1620.short