I have personally revised over 20 malfunctioning ADRs with good results. Why your surgeon did not use flexion-extension films is a mystery I can’t solve. A simple way to determine is this level is causing pain is to perform bilateral TFESI/SNRBs and keep a pain diary. If your pain resolves temporarily, this level is causing the pain.
See:
https://neckandback.com/treatments/epidural-injections-and-selective-nerve-root-blocks-diagnostic-and-therapeutic-neck/
https://neckandback.com/treatments/pain-diary-instructions-for-spinal-injections-neck/
Dr. Corenman