Hello, Spondylolisthesis (what you are having) is a common form of nontraumatic spinal instability, in which occurs forward slippage of a lumbar vertebra with relation to the next lower vertebra on which it rests. In your case 5th lumbar vertebrae( LV5 ) has slipped over 1st sacral vertebra(SV1 ). This results from degenerative disruption of the pars interarticularis, the critical bridge of bone that spans adjacent facet joints. This may cause low back pain that is exacerbated with movement and load bearing (mechanical low back pain). Retrolisthesis is sliding back of vertebrae(LV 4) over lower vertebrae(LV5) on which it rests. Most acute herniated lumbar discs improve symptomatically without surgery. Surgery(discectomy) is indicated for symptoms persisting more than 6 to 8 weeks, the progressive motor deficit (e.g., foot drop), or for patients with incapacitating pain not manageable with analgesics. Discectomy is performed using a midline incision, partial removal of the overlying laminae (hemilaminectomy or laminotomy), identification of the thecal sac and nerve root, and extraction of disc fragments. After lumbar discectomy, approximately two-thirds of patients will have complete relief of pain, and up to 85% will have significant improvement. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Tushar Kanti Biswas, Internal Medicine Specialist