Fixation is required in the following cases: 1. lumbar disc herniation combined with lumbar spondylolisthesis and lumbar instability; 2. lumbar disc herniation combined with spinal stenosis (most have symptoms of intermittent claudication), requiring extensive decompression; 3. postoperative lumbar disc herniation recurrence secondary surgery; 4. high lumbar disc herniation; 5. more than two multi-segment lumbar disc herniation, requiring extensive decompression; 6. extreme lateral disc herniation, requiring destruction of small joints; 7. age greater than 45 years old, requiring strong physical labor.