The issue with C7-T1 is not the disc... it's the difficulty in the approach. Bertagnoli has done many of these. We skipped my C7-T1 because the disc was not too severely compromised, but T1-T2 was and Bertagnoli replaced it.
Yesterday I was talking to a very experienced US cervical ADR surgeon and he was surprised that T1-T2 was even possible via the anterior approach.
The ability to do C7-T1 and T1-T2 depends upon your anatomy. (Long neck folks are possible, short neck folks are not.) It also depends upon the surgeon's experience.
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