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Nerves can become irritated after surgery. That causes burning pain and sensitivity in the distribution of the particular nerve (in this case L5, between the big toe and second toe). Swelling, debris, or stretch can be the cause of such irritation. Since six weeks have passed since the surgery, electrodiagnostic testing can be helpful to determine if there is nerve damage.   Sometimes, complications lead to a second surgery. Acute, severe nerve damage would be a reason for utilizing this last option. If the nerve is functioning normally, then the nerve symptoms can improve with medications like anti-inflammatories, anti-convulsants, and anti-depressants.   Keep in close contact with your surgeon anytime you experience complications after surgery. Dr. Christina Lasich, MD