I will let someone more knowledgeable reply.
But I wouldn't guess that it is the nerves from the rhizotomy growing back already (unless you have super fast growing nerves). It usually takes 9-12 months for nerves to grow back, and sometimes even up to 18 months. **This is only based on reading I have done. I am not a medical expert. 
Sorry you are having some new pain Phylly. I hope it isn't your back. But, I'm sure you know that 2 months is still early in recovery, especially from fusion. And you are bound to have odd aches and pains. I suggest calling your doctor though, and see what they have to say. I hope you feel better soon.
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Cathy
46 years old. 12-15 years of intermittent pain, 2 years with constant pain.
DDD, L4-5 and L5-S1, pain confirmed by discogram.
PT, ESI's, Facet injection and block, Acupuncture - all no help.
2-level (Prodisc-L) ADR surgery with Dr. Bertagnoli, May 26, 2009.
Currently taking Opana-ER (tapering off) and oxycodone
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