It is what it is. It looks like the joint is functioning as the relative angle of the plates moves as expected with flexion/extension.
IMHO, if the pain us unchanged or the same pain is worse after surgery, the pain generator was somewhere else and looking at the implantation is a distraction. (no pun intended)
What did C3-4 look like on MRI? discography?
Your disc is not subsided. If it looks the same as it did in the interoperative or immediate post-op images, then it's not migrated.
What were your symptoms like pre and post-op?
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