Three-dimensional finite element analysis of pedicle screw stress following two intervertebral fusion treatments in L4/5 segment   
Li Dong-zhe, Chen Fei, Kang Yi-jun
Chinese Journal of Tissue Engineering Research . 2011, (13): 2295 -2298 .  DOI: 10.3969/j.issn.1673-8225.2011.13.005