Biomechanics of lumbar cortical bone trajectory screw fixation

doi:10.3969/j.issn.2095-4344.2017.03.007

Abstract

Abstract:

BACKGROUND: Santoni put forward the cortical bone trajectory technology by changing the traditional pedicle screw placement for lumbar internal fixation in order to obtain better control of the screw and bone in 2009.

OBJECTIVE: To analyze biomechanical stability of cortical bone trajectory system in the lumbar fusion.

METHODS: Twenty fresh newborn calf L_3/4, L_5/6 motion segment specimens were obtained, and their ranges of motion were detected under different states, as normal controls. Subsequently, twenty samples were divided into cortical bone trajectory screw group and traditional pedicle screw group, which underwent cortical bone trajectory screw fixation combined with posterior lumbar fusion and traditional pedicle screw fixation combined with posterior lumbar fusion, respectively. Without destruction, ranges of motion were detected under different states in both groups. In the revision group, after the test in the traditional pedicle screw group, screw was withdrawn, and cortical bone trajectory screw was used to detect its range of motion under different states.

RESULTS AND CONCLUSION: Ranges of motion at bending to the left and right, anteflexion, posterior extension and axial rotation were significantly lower in the cortical bone trajectory screw group and traditional pedicle screw group than in the normal control group (P < 0.05). No significant difference in bending to the left and right, anteflexion, posterior extension and axial rotation was detected between the cortical bone trajectory screw and revision groups and traditional pedicle screw group (P > 0.05). These results confirmed that cortical bone trajectory technology combined with posterior lumbar fusion can obtain identical stability as the traditional pedicle screw fixation combined with posterior lumbar fusion. Simultaneously, it is a new choice for revision after traditional pedicle screw fixation.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Spinal Fusion, Biomechanics, Tissue Engineering

CLC Number:

R318

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R318

Yao Yu, Xue Hua-wei, Zhao Jian, Zhang Feng, Cao Yong, Chen Xiang-dong, Zhao Jin-long, Jiang Xing-jie. Biomechanics of lumbar cortical bone trajectory screw fixation[J]. Chinese Journal of Tissue Engineering Research, 2017, 21(3): 362-366.

Figures/Tables 3

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