I have a client who has had 2 Charite's removed. (L3-4-5).  Contact me off the forum and I'll give you details and contact info if you would like. 
 
IMHO, each revision is a one of a kind surgery... each revision is a unique case.  Unfortunately, we'll ultimately see the day when revision experience will be so great that revisions won't seem like the great unknown.   
 
Mark 
		
		
		
		
		
			
		
		
		
		
		
	
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