Lumbar spondylolisthesis is a disorder in which the lumbar vertebrae are partially or completely misaligned, and is commonly referred to clinically as a slipped vertebra, generally a forward slippage of the superior vertebra. The incidence of lumbar spondylolisthesis is 3-7% in Europe, and there is a lack of accurate statistics in China. It is generally believed that routine X-ray examination of patients with low back pain reveals a tendency for about 5% of adults to suffer from lumbar spondylolisthesis. The most common cause of lumbar spine slippage is degenerative lumbar spine slippage that occurs with age, also known as pseudoslippage; followed by lumbar spine slippage caused by sports injury, congenital or unknown causes of lumbar spine isthmus collapse, also known as true slippage; lumbar spine slippage occurs between the lumbar 4~5 vertebrae and between the lumbar 5~sacral 1 vertebrae. Why does lumbar spondylolisthesis occur? Degenerative lumbar spondylolisthesis is due to long lasting instability of the lumbar spine, which causes degenerative changes in the corresponding small joints, and the joint protrusion becomes horizontal, together with the degeneration of the intervertebral disc, which makes the connection between the vertebrae loose and unstable, and gradually occurs lumbar spondylolisthesis. Mostly seen after 50 years old, more women than men, mostly occurring in the lumbar 4 vertebrae forward slip, followed by the lumbar 5 vertebrae forward slip. The degree of degenerative lumbar spondylolisthesis is usually relatively mild. The lumbar slippage caused by the collapse of the isthmus of the lumbar spine is called true lumbar slippage, the cause of the isthmus collapse is still not very clear, it may be related to the narrow and weak isthmus of the lumbar spine during development, fatigue fracture and fracture, after which the fracture does not heal; it may also be caused by trauma to the lumbar spine during adolescence; there may also be partly related to the repeated injurious stimulation of the isthmus when the lumbar spine is posteriorly extended, which is mostly seen in the long doing flash back sports adolescent athletes. The isthmus may not appear to be slipping in the early stages, but after many years of isthmus breakdown, the lumbar spine may gradually slip due to the destruction of the stable structure of the lumbar spine, and the degree of lumbar spine slippage may be severe over time. True slippage of the lumbar spine caused by lumbar isthmic fracture occurs between the lumbar 4 to 5 vertebrae and between the lumbar 5 to sacral 1 vertebrae, and is most common in adults and rare in children.