A: Another factor is that your pain mostly can be managed and that you are able to exercise which to me is a huge deal. I can't believe the distances you've ridden. 
 
I also am concerned about the domino effect of a fusion and wonder if there can be a pre-emptive ADR put above the fused level to avoid disc degeration - at the beginning of the domino process. 
 
Good luck - Allan 
		
		
		
		
		
		
		
	
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