@dodders1952
I also had relief after my decompression/fusion surgery once I recovered from the open surgery pain (they cut through muscle which was very painful). Hopefully, you had minimally invasive surgery.

My pain improved and then I got new pain several months after my surgery and now believe it was due to compressed nerves trapped for over 12 years were finally free and starting to heal. Nerve healing can be painful. I started to have some relief of nerve pain from healing after 6 months.

You will want to keep an eye on your L4-L5 over time to make sure you don’t have any disc herniations/vertebrae slippage. Since vertebrae are cut during the laminectomy procedure, the strength is changed. Sort of like removing blocks from a foundation or panels/shingles on a roof.