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				 Good explanation 
 Thanks, Mark, that makes sense.  I have read that autologous bone has a higher chance of success than allograft, and certainly can understand why BMP might be a risk in a hybrid.
 The hybrid sounds like an excellent approach to an L4 - S1 two-level.  Apparently a more difficult recovery, but good long-term prospects.  Wish you luck with it, and look forward to reading about your progress, Fuzz.
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