thank you for consulting us,
you are suffering from a serious problem of desiccated lumbosacral spine L4-L5.
since you are having this from quite a long period of time , i.e. around 4 1/2 years, you must have tried all the conservative methods to decrease your pain.
your recent MRI
report must have suggested deterioration in your condition, thus the incharge doctor has advised you with only one option that is surgery.
since your condition is deteriorating so surgery is the best option presently, as it will definitely improve your condition, though it is a major and invasive operation.
outcome of most of these surgery is good .
hoping you take the correct decision and get yourself operated soon,
wishing you good health.