1Girardo M, Bettini N, Dema E, et al. Uninstrumented posterolateral spinal arthrodesis: is it the gold standard technique for I degrees and II degrees grade spondylolisthesis in adolescence? [J]. EurSpineJ,2009,18(Suppl 1) :126 -132.
2Lee JH, Jeon DW, Lee SJ, etal. Fusion rates and subsidence of morselized local bone gra{ted in titanium cages in posterior lumbar interbody fusion using quantitative three-dimensional computed tomography scans[J]. Spine (Philad Pa 1976), 2010, 35(15) : 1460-1465.