For patients with obvious lumbar instability: the surgery needs to remove the herniated disc and enlarge the narrowed nerve root canal to relieve the pressure on the nerve roots; at the same time, it is necessary to choose the appropriate internal fixation combined with bone graft fusion to restore the stability of the spinal column, so as to relieve the symptoms. Or surgical decompression range is large: may cause lumbar spine instability in the future: for this type of patients should also consider doing internal fixation. This type of surgery is relatively complex, with more bleeding, and some patients may even need to be operated from the back and front of the lumbar spine successively or simultaneously.