下腰椎L4/5棘突间撑开器的生物力学研究

doi:10.3969/j.issn.0258-8021.2014. 06.013

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Abstract To analyze the effect of the stability of an implanted homologous XSTOP device in the injury segment L4/5 and the biomechanical behavior of adjacent segments. A CTscanner was used to acquire normal lumbar images. With the help of Mimics14, Geomagic Studio2012, Hypermesh12 and Abaqus612-1, the finite element (FE) model (the lower lumbar L2～L5 segments) with or without interspinous spacer XSTOP was constructed. Upon validation, a finite element model of L2～L5 was developed to simulate and analyze the biomechanics of the intact and XSTOP dynamic fixation states by simulating flexion, extension, lateral bending and axial rotation. The comparison of degree of freedom (DOF) and intradiscal pressure of two set models predicted that the levels adjacent to the implanted level were not significantly affected by the implanted XSTOP. There was a distinct restriction in the range of extension and intradiscal pressure at the implanted segment, and DOF decrease to 7483%. Furthermore, the largest von Mises stress showed on the interface between the spinous process and the implant at the position of extension. Respectively, the largest stress value is 333 MPa and 1356 MPa. In conclusion, the XSTOP can effectively restrict the DOF of extension and unloading disc pressure, without affect adjacent segment. Moreover, this study also provides theoretical and biomechanical analysis to support the clinical performance of the XSTOP and its further improvement of the device design.

Key words： XSTOP biomechanics interspinous process spacer dynamic fixation lumbar spinal stenosis

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	CAI Fang Zhou¹
	2 GU Xue Lian^1*HAN Shou Peng²SONG Cheng Li¹Chen Bo³

Cite this article:

CAI Fang Zhou^1,2GU Xue Lian^1*HAN Shou Peng²SONG Cheng Li¹Chen Bo³. Biomechanical Effect of an Interspinous Process Spacer for L4/5 of Lower Lumbar: a Finite Element Analysis#br#[J]. journal1, 2014, 33(6): 729-736.

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http://cjbme.csbme.org/EN/ 10.3969/j.issn.0258-8021.2014. 06.013 OR http://cjbme.csbme.org/EN/Y2014/V33/I6/729

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