Except for lumbar spinal stenosis caused by congenital developmental anomalies, all others are secondary lumbar spinal stenosis, mainly including the following types: 1, degenerative lumbar spinal stenosis: the most common cause of low back pain, caused by aging of the lumbar vertebrae, which accounts for about 70% of the total; 2, slipped spinal stenosis: lumbar vertebrae slipped off the vertebral stenosis caused by the lumbar spinal stenosis; 3, traumatic spinal stenosis: trauma leading to fracture or subluxation; 4, medically induced spinal stenosis; 5, a variety of inflammation of the vertebral canal: including atopic and non-atopic inflammation, and also lumbar vertebrae tumors, etc..