inflammation
			 
			 
			
		
		
		I believe that cracking also has secondary mechanism from inflammation of either joints or muscles/tendons/ligaments.  My thoracic has cracked since injury which seems to have origin in an injury vs. joint gasses.  Immediatly after my ESI that worked I lost all cracking in the thoracic area.  This occured again when that one wore off then had another.  I asked doctor about it and he said the muscles were tightened by nerve inflammation and that the joint is moving abnormally due to muscles.  I also had same occurence in lumbar with recent injection. 
		
		
		
		
		
		
		
	
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