Comparison of three sacral screw internal fixation techniques in the treatment of L4–S1 lumbar degenerative disease with osteoporosis: a retrospective observational study af Guo-ning Gu, Teng Liu, Jie Ding, Hui-zhi Guo, Guo-ye Mo, Yong-xian Li, Kai Yuan, Zhi-dong Yang, Shun-cong Zhang, Yong-chao Tang

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