Rib-breastbone joint: Cracking a joint moves the parts of the joint, with the cracking noise coming from cartilage surfaces sliding, from movement of a little air-space from one place in the joint to another, or from some other non-traumatic event. A person with no joint pains before or after cracking a joint is probably not damaging the joint. A doctor can evaluate pain or stiffness associated with cracking noises.
Answered 11/8/2012
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Trauma: Most commonly from direct blunt trauma.
Answered 4/21/2013
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