I had xrays last week and all looks fine almost 4 months post 8 level fusion then all of a sudden I shut a pantry door and heard a loud popping sound from my back. Now it is doing it frequently. I can not tell if something is moving along with the sound. Called my doctor and he said a few patients have expressed a similar concern. He said if I have no extra pain I should be fine. Honestly it is freaking me out. Feels like something rubbing or catching with the noise. Any thought? Anyone else have this?