I have had 3 surgeries on my back. Fusion of L3-L5 7 years ago and then fusion of L2 and revision of previous fusions 15 months ago. Then a revision of L4-5 a week later. Just had an x-Ray because of popping and pain in the spine. This showed a severe instability at L2-on L3. I am being referred to an orthopedic back surgeon. Is this something that will require another surgery an uf so what would be the normal surgery for this.