Date: Around 1993
Why do your joints pop? For example, when I am walking my ankle
always makes a popping sound? I think it has something to do with the air
(space) in the joint but I do not know.
One reason is that tendons snap a little like plucking guitar
strings. Another reason is because of a release of gas dissolved in the fluid
of the joint. Sometimes joints make crunchy noises due to small bone
fragments in the joint (like sand under a steel wheel). Joints can also make
popping noises when they dislocate (this is usually painful).
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Update: June 2012