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Although the researches and the use of the artificial inter-vertebral disc and the artificial nucleus pulposus are developed,the anterior and posterior inter-body fusion(ALIF & PLIF) are still the main treatment way of lumbar diseases,because of the limitation of range of indication and lack of data of long-term effects of artificial disc and nucleus pulposus.With the development of the instruments,the use of lumbar inter-body fusion became more and more common,but with the data of long-term follow-up becoming available,it was discovered that there are still some problems unsolved about lumbar inter-body fusion.