If your symptoms are sciatica
on the left side, it corresponds with your MRI
scan and the operation has a statistically greater probability of giving you good relief of the sciatica. In fact, in studies it has been proved that the major benefit from surgery is early return to work. However the choices on the table include surgery, interventional pain procedures like the epidural or continuing with painkillers etc. In the long term, none of these 3 choices have a particular advantage over the other. So you'll need to think through the pros and cons of all the options and choose whats best in your specific situation.
Hope this helps