1Pfirrmann CW, Metzdorf A, Zanetti M, et al. Magnetic resonance classification of lumbar intervertebral disc degeneration[J]. Spine, 2001,26(17) :1873-1878.
5Chen IR,Wei "IS. Disc height and lumbar index as independent pre- dictors of degenerative spondylolisthesis in middle-aged women with low back pain. [J]. Spine(Phila Pa 1976) ,2009,34(13) : 1402-1409.
6Giudici F,Minoia L, Archetti M,et al. Long-term results of the direct repair of spondylolisthesis [J]. Eur Spine J, 2011, 20 ( Suppl 1 ) : S115-S120.
8Fan J, Yu GR,Liu F,et al. A biomechanical study on the direct repair of spondylolysis by different techniques of fixation[J]. Orthop Surg, 2010,2(1) :46-51.
