by 
agent1337
ANSWERS: 3
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I dont think its your bones but your cartilage that actually makes the "cracking" sound, I could be wrong. If your bone cracked, that would mean its broke right?
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The cracking sound is acually air pockets popping in your joints.
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The cracking sound is actually caused by gas leaving the solution of the synovial fluid in the joint, forming a bubble which then "pops" to create the characteristic sound.
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