Slipping forward of the lumbar spine may be related to congenital dysplasia, degenerative lesions, trauma, surgery, other diseases and other causes. 1. Congenital dysplasia: It is mostly considered that during the development of lumbar spine, the ossification center between the vertebral arches does not heal, resulting in congenital isthmus collapse and disjunction, which then causes the lumbar spine to slip forward. It may also be caused by abnormal development of the fifth lumbar arch. 2. Degenerative diseases: mainly because of the degeneration of lumbar intervertebral discs, resulting in intervertebral instability, laxity of the anterior ligament, which will occur in the lumbar spine forward slippage. 3. Trauma: when the lumbar spine is subjected to acute trauma, it is easy to lead to fracture of part of the spinal column, so it will cause slippage. 4. Surgery: Generally, during surgery, excessive decompression of the posterior structures of the spine causes the spine to become less stable, resulting in slippage. 5. Other diseases: Secondly, lumbar spine forward slippage is also clinically often secondary to lumbar spine tumor, metabolic bone disease and other diseases. When the patient occurs lumbar spine forward slippage, need to go to the hospital to improve the relevant examination, clear the specific cause.