I had an ACF (anterior cervical fusion) on 2 discs - they fused them and put titanium plates and cages in. I have never had an issue with diving after the surgery. I also have a dive buddy that had the "elevator" in his lower back. Basically, it’s a couple of cables and rods. He continues to dive with no issues. He did make sure to build up his strength in his back before he went diving, though.