Evaluation of clinical symptoms improvement after surgery: VAS (Visual Analogue Scale) back pain improved from 6, 22 ± 1, 06 to 1, 89 ± 1, 50, VAS leg pain improved from 5, 90 ± 1, 40 to 1, 25 ± 1, 50, ODI (Oswestry Disability Index) improved from 49, 41 ± 8, 00 to 15, 18 ± 11, 58.