Yang J, Lee J, Song H. The impact of adjacent segment degeneration on the clinical outcome after lumbar spinal fusion. Spine (Phila Pa 1976). 2008;33:503-7 pubmed publisher
..The impact of ASD on clinical outcome after fusion showed a significant correlation, especially with the ASD after multiple-segments fusion. Careful attention is needed in multiple-segments fusion such as degenerative lumbar deformity. ..