In lumbar disc herniation, more than 90% involve the two lowermost intervertebral spaces. This is because on the one hand, the lower two intervertebral spaces are heavily strained, degenerated and easily herniated, and on the other hand, the lumbar 5 and sacral 1 nerves cross the lower two intervertebral discs respectively in the spinal canal, and when the discs herniate, the compression and pulling of the nerve roots produce typical clinical symptoms and are easily detected clinically. Most statistics show that lumbar disc herniation is easy to occur on the left side, mainly because most people exert their right hand during sports and labor, the right side of the lumbar back muscle tension is stronger, the corresponding pressure on the right side of the disc is greater, the squeezing force is transmitted to the left side, which can make the left side of the fibular ring tear, and squeeze the nucleus pulposus to the left side and cause protrusion.