After local infiltration with 1% lidocaine with 1: 200,000 epinephrine solution, a posterior midline skin incision was made extending from approximately L3 to the inferior aspect of the sacrum. 
After local infiltration with 1 % lidocaine with 1 : 200,000 epinephrine solution , a posterior midline skin incision was made extending from approximately L3 to the inferior aspect of the sacrum .