@denman55 My knowledge of lumbar spine surgery is from what I've learned watching surgeon presentations at conferences that I have found online. Pedicle screws can pull out if they are not placed at the correct angle. Of course bone quality (density) is important to being able to hold screws. Is that something that your surgeon checked on before doing your surgery? The lower spine has a lot of pressure from your body weight being concentrated there.

I presume you are communicating with your surgeon, and they probably ordered the x -rays. Are you getting this information from the radiologist report? Your surgeon may have a different opinion on the imaging. Radiologists need to suggest every possibility from what they see on imaging so they don't miss something. Sometimes it looks different from different angles and you need to consider all of that together to understand it in 3 dimensions.

I would be worried too. It doesn't sound like good news. Be proactive with your questions. Ask about bone quality. It is possible your surgeon will offer a revision that also includes the herniated levels above your surgical site. I'm sorry, that is a lot to be going through.