About the nerve damage that would have happened during the disease process whether they improve after surgery. TILF or they don’t improve. The point is if it is permanent damage happened to the nerve because of long standing disease process it will not improve and is it is short process that is within few months you have come and got operated then the nerve damage that must have happened leading to nerve weakness or muscle weakness will recover over a period of time. But the recovery of the nerve after Spinal surgery is never guaranteed, the surgery is to prevent further nerve damages to the muscles and and sensation of lower limbs.
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