Preoperatively, the patients had: According to Visual Analog Scale, the low back pain and radiating pain of lower extremities were 8 ± 0.86 and 7.45 ± 1.5; mean Owestry Disability Index was 66.3%; The lumbar scoliotic and lumbar lordotic angle on X-ray were 20.30 ± 6.50 and 19.90 ± 18.80.