Hello. Thank you for posting.
We can't say exactly what your surgeon will do. You will need to ask him or her what the procedure entails. One common treatment is a Laminectomy. The procedure removes the back part (lamina) of the affected vertebra. A laminectomy is sometimes called decompression surgery because it eases the pressure on the nerves by creating more space around them.
More information from Mayo Clinic on the various ways spinal stenosis is treated:
I hope you feel better soon.