I've been told to focus on core strength, and that I have to make a personal decision as to whether to have the surgery. If I think my daily pain, and then my episodic acute pain is so bad that I can't live with it, we'll try lumbar surgery, including fusion.
However, the orthopedic surgeon I interviewed admitted that (a) he couldn't guarantee any relief from pain in my back - the leg, yes, the back no (b) he couldn't guarantee that I wouldn't come out of the surgery in functionally worse shape. He encouraged me strongly to live with what I had, and not consider cutting until it got unbearable.
I obviously don't know where you're at in terms of pain, mobility, etc.
I hope you find some relief.