Design and biomechanical properties of a novel low elastic modulus spine pedicle screw

doi:10.3969/j.issn.2095-4344.2016.53.008

Abstract

Abstract:

BACKGROUND: Bone cement is commonly used to strengthen pedicle screws that can improve the ability of screw fixation, but the bone cement leakage and difficulty of screw out remain to be resolved.

OBJECTIVE: To investigate the development and biomechanical characteristics of a novel low elastic modulus pedicle screw.

METHODS: The novel low elastic modulus pedicle screw was implanted into one side of vertebral pedicle removed from a human complete spine, followed by 2 mL bone cement perfusion using bone cement pusher and infusion tube under X-ray, while the conventional screw was implanted into the contralateral side as control. All vertebrae underwent the three-point bending test, maximum axial pullout force, maximum torque and cyclic bending resistance test.

RESULTS AND CONCLUSION: (1) The novel low elastic modulus screw and conventional screw had no significant difference in the yield load (P > 0.05). The yield displacement, maximum pullout force, maximum torque and maximum loading of the novel low elastic modulus screw were all significantly higher than those of the conventional screw (P < 0.05), while it showed significant reduction in displacement (P < 0.05). (2) These results indicate that the novel low elastic modulus pedicle screw is easy to operate, avoids the bone cement leakage, and can improve the biomechanical properties and stability of osteoporotic vertebrae and keep the spine stiffness and stability, which is beneficial for spinal fusion.

Key words: Tissue Engineering, Spine, Biomechanics

CLC Number:

R318

Ruan Zhi, A Lu-ti. Design and biomechanical properties of a novel low elastic modulus spine pedicle screw[J]. Chinese Journal of Tissue Engineering Research, 2016, 20(53): 7959-7965.

Figures/Tables 1

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