The harmful effects of sacral lumbarization include the following aspects: first, when the spine has been incomplete, only unilateral sacral lumbarization occurs easily cause lumbosacral pain, but the pain symptoms are not heavy, and the pain symptoms are aggravated when traumatic arthritis is formed; second, sciatica, uneven weight bearing on both sides of a few intervertebral discs, causing degenerative disc changes or disc herniation, resulting in sciatic nerve pain symptoms; third, abnormal activity. Unilateral sacral lumbarization, the lumbarization side of which tends to have relatively increased mobility. Treatment methods include conservative treatment for those with mild symptoms, such as physical therapy, functional exercise of the lumbar back muscles, lumbar circumference and pain medication. For severe symptoms, conservative treatment is ineffective and spinal canal or vertebral body fusion is feasible.