That's a completely different question. You are not talking about a single level cervical fusion, you are talking about having a 3-level cervical fusion that is fused to your thoracic spine. Ask your surgeon about the potential for different loading on the level above the construct for fusion vs. ADR.
I believe that the difficulties at that level have to do with the difficulty in getting your shoulders out of the way for interoperative imaging. (There may be other reasons....I can be wrong here, but this is what I remember.)
Mark
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