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I came up with a reason that is more plausable then air pockets.
Like so: The muscles and ligaments pull the join together and eventually squeeze out the fluid and forms a suction much like
a suction cup on a window pane. The joint must then be separated to "break the suction". When the suction is broken we get the same pop as pulling the suction cup off the window pane and
the fluid rushes <font size=5>Back In</font> and <font size=5>NOT</font> out. The suction must build up again as the fluid is pressed out and this is why you have to wait to crack the knuckle again.
The suction on the joint is what causes the stiff feeling that makes people desire to crack the joint.
There.
That other shit about air pockets is bullshit.
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