Well it is a good question and in theory it sounds good. The injection has 3 parts to it. It will numb the pain, it will ease the swelling and inflammation and it should help to lubricate the myelin (sheaths that cover the nerves).

It is a more conservative approach than surgery but it is not without it's risks. The interlaminar injection would be a similar approach with a similar outcome. RFA is yet again another approach that can be taken. I would try what they are suggesting and progress to the others if one isn't successful. They are all better alternatives to surgery.