Normally, the nail can be removed about 1 year after lumbar fixation and fusion surgery, but some patients may have it removed earlier or later depending on their specific condition. Under normal circumstances, the time to remove the internal fixation after lumbar internal fixation and implant fusion is 1 year after the operation, because at this time the bone between the two vertebrae that have been fused has basically been relatively stable, and is able to withstand its own body weight and most of the physical labor, and the adhesion of the soft tissues around the fusion site is relatively small, so that the removal of the internal fixation is relatively easy, and the number of complications is also reduced. In some special cases, the time of removing the internal fixation may be advanced, such as postoperative loosening of the internal fixation, breakage, infection and other conditions of the patient, need to be removed in advance, lumbar foreign body sensation is serious or the internal fixation of the patient affects the normal lumbar activities, but also in the case of 3 months after the operation, the bone quality recovery is better to take out in advance. In addition, if the combination of diabetes and other underlying diseases of patients, may need to delay the removal of patients with poor physical condition or some elderly patients can even be lifelong.