which includes putting in screws, rods and fusing the listhetic segment is a very common spinal procedure. It can give good relief to pain if done for the correct indication. It is likely to improve the shooting leg pain more than the low back ache. All surgeries carry some risk and here the risks which are to be highlighted are of leak of spinal fluid, damage to the spinal nerve
roots causing weakness/bladder or bowel or sexual dysfunction
and failure of the operation apart from complications like infection, bleeding etc. In the long term, the risk is of failure of fusion and implant failure. that said, if the operation is performed when correctly indicated and in good hands can provide good pain relief for most patients.