Degenerative lumbar spondylolisthesis is a common disease of the spine that can cause back pain or radiating pain in the legs. It has a wide range of categories from an extremely pathologically stable collapsed disc to heightmaintained disc with significant displacement in dynamic radiation imaging. Most patients with lumbar spinal stenosis and degenerative spondylolisthesis respond to nonsurgical treatment. Therefore, only 10%-15% of patients are known to require surgical treatment. 1) Surgical treatment is generally known to be effective 2-4) and consists of two methods: decompression alone and decompression combined with additional fusion. However, it is unclear which of the two methods is the better treatment. In meta-analysis and systematic literature reviews, clinical outcomes tended to be better when additional fusion was performed; 5-7) however, other studies have indicated that additional fusion is not cost-effective compared to decompression only and is associated with more severe compli
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