@robson78 One of the risks associated with artificial discs is that bone can grow around the implant trying to stabilize it. Sometimes the artificial disks are removed and a fusion is done instead. No one wants to have another surgery, but it may be necessary because the spine can fuse around the disc implant. It is worth paying attention to any progression of bone growth on imaging since your surgery and discussing all of that with your surgeon.

Are you sure bone spurs were left behind or did they grow since your surgery? I had a fusion and there was a slight regrowth of a bone spur because it is right were the fusion went together and they grow from pressure, but it isn't significant and doesn't cause any symptoms. If you do have some spinal cord compression in your neck, it can cause leg weakness. It did for me. That can also be caused by a lumbar spine problem. One predictor of funicular pain is when you have an epidural injection in your neck and it takes away the pain. That was true for me, the injection took away all of my pain temporarily. There isn't a diagnostic test for it, and a lot of surgeons are confused by this. If you have bone growth around an implant, that may be reason enough alone for surgery even if you can't confirm funicular pain.