Hello and thanks for using HCM. I have read your question and understand your concerns. The most probable diagnosis in your case is spondylolysthesis at L5/S1 level. Symptoms are caused by compression of your spinal cord at this level. MRI will give additional information about your concerns. The surgery to correct this problem is called posterior stabilization (spondylodesis) with or without laminectomy. If all goes well, you should leave the hospital in one week and full or near full recovery is expected in six months. Hope you found the answer helpful. Take care.