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Originally Posted by Dave Stones
well how come my fluid mechanics lecturers have LIED to me then? i am shocked and appalled..........
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They are horribly misinformed. The crack/pop noise is produced because when you distract the joint surfaces (pull them apart) the pressure drops in the joint. When that happens, nitrogen (which is dissolved in the synovial fluid( joint lubricant)) comes out of solution and forms bubbles which 'pop' or cavitate.....which is why it's called cavitation.
20 minutes later it has fully dissolved back into the fluid and you can pop the joint again.....not that you should.