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Nerves going into the legs can be injured during low back surgery, resulting in the kinds of symptoms you are experiencing. They can take up to 6 months, sometimes more, to heal completely to their pre-surgical state. If there has been little to no improvement since July, you should ask your doctor about getting nerve conduction studies (NCV/EMG) to assess the health of the nerves. This will give you some sense of whether there is measurable damage, where the damage is located, and how long it has been there. This can help with physical therapy, which you should be getting, and serve as a baseline for comparison down the road to assess progression or healing. In the meantime, if you are not already taking a nerve stabilizer (eg. gabapentin, pregabalin, cymbalta) you should do so to calm the injured nerves down and get some relief. Ask you doctor about this, as they are prescription medications.