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Biomechanical effect of the correction on the anchoring strength of de-orbiting S1 bicortical pedicle screw - An in-vitro investigation in normal and osteoporotic conditions 期刊论文

编号：

71679628-01ac-4945-bda0-645e4833b37d
作者：

Zhuang, XinMing(庄新明)#^[1]Fu, ChangFeng(付长峰)^[1]Liu, WanGuo^[2];Xu, Feng(徐峰)^[1]Shi, Bo^[1];Ma, HongYun^[1];Zhang, Qi^[1];Yu, BinSheng*^[3]Liu, Yi(刘一)*^[1]
语种：

英文
期刊：

CLINICAL BIOMECHANICS ISSN：0268-0033 2016 年 36 卷 (26 - 31) ; JUL
收录：
关键词：

Lumbosacral fusion Osteoporosis Biomechanics S1 bicortical pedicle screw De-orbiting screw Correction
摘要：

Background: The proper anchoring zone at the anterior sacral cortex is vital for the stability of Si bicortical pedicle screw. During implantation, de-orbiting S1 bicortical pedicle screw is encountered occasionally and immediate correction is biomechanically required, especially in osteoporotic condition. Nevertheless, the biomechanical changes of the de-orbiting S1 bicortical pedicle screw after correction in different bone qualities remain unclear. The purpose of this study was thus to evaluate the biomechanical changes of the de-orbiting S1 bicorticalpedicle screw after correction.
Methods: 18 fresh-frozen human sacra were divided into the normal and osteoporotic groups. The control and de orbiting S1 bicortical pedicle screws were established randomly on either side of the sacrum. Following fatigue loading test, the subsidence displacement and axial pull-out strength were measured and analyzed.
Findings: In normal group, the subsidence displacement of the de-orbiting screw was increased significantly by comparison with the control one (median 0.37 vs. 0.36 mm) (P = 0.009); but no significant difference of the maximum pull-out strength between the two screws (median 359 vs. 353 N) (P = 0.262) was observed. In osteoporotic group, when compared with the control screw, the subsidence of the de-orbiting screw increased significantly (median 1.14 vs. 0.74 mm) (P = 0.012) and the maximum pull-out strength decreased obviously (median 151 vs. 252 N) (P = 0.012).
Interpretation: For normal bone quality, comparable stability could be achieved in the de-orbiting S1 bicortical pedicle screw after correction. Nevertheless, in osteoporotic condition, the correction procedure could not effectively prevent the loss of anchoring strength, and hence additional immediate augmentation fixation should be considered. (C) 2016 Elsevier Ltd. All rights reserved.
推荐引用方式
GB/T 7714：

Zhuang Xin-Ming,Fu Chang-Feng,Liu Wan-Guo, et al. Biomechanical effect of the correction on the anchoring strength of de-orbiting S1 bicortical pedicle screw - An in-vitro investigation in normal and osteoporotic conditions [J].CLINICAL BIOMECHANICS,2016,36:26-31.
APA：

Zhuang Xin-Ming,Fu Chang-Feng,Liu Wan-Guo,Xu Feng,&Liu Yi.(2016).Biomechanical effect of the correction on the anchoring strength of de-orbiting S1 bicortical pedicle screw - An in-vitro investigation in normal and osteoporotic conditions .CLINICAL BIOMECHANICS,36:26-31.
MLA：

Zhuang Xin-Ming, et al. "Biomechanical effect of the correction on the anchoring strength of de-orbiting S1 bicortical pedicle screw - An in-vitro investigation in normal and osteoporotic conditions" .CLINICAL BIOMECHANICS 36(2016):26-31.
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