新型低弹性模量医用β钛合金Ti2448椎弓根螺钉内固定影响胸椎稳定性的生物力学测试

发布时间：2019-06-09 12:56

【摘要】：背景:新型医用β钛合金Ti2448(Ti-24Nb-4Zr-7.9Sn)是迄今为止初始杨氏模量最低的钛合金,其初始杨氏模量约40 GPa,平均杨氏模量20 GPa,抗拉强度约900 MPa,与人体组织的生物相容性和力学相容性优异。目的:探讨新型低弹性模量脊柱椎弓根螺钉内固定系统的生物力学性能,并与Ti6Al4V椎弓根螺钉进行比较。方法:取60个新鲜人尸体胸椎椎体标本,随机选择一侧椎弓根置入新型低弹性模量Ti2448椎弓根螺钉,另一侧椎弓根置入Ti6Al4V椎弓根螺钉,检测两组螺钉的最大弯曲载荷与最大载荷时位移、最大旋入力矩及最大轴向拔出力。结果与结论:两组螺钉的最大弯曲载荷、最大载荷时位移、最大旋入力矩、最大拔出力比较差异均无显著性意义。结果表明,新型低弹性模量Ti2448椎弓根螺钉内固定系统的最大弯曲强度、最大旋入力矩、最大拔出力与Ti6Al4V螺钉基本一致,可满足脊柱生物力学在内固定强度方面的需求。
[Abstract]:Background: the new medical 尾-titanium alloy Ti2448 (Ti-24Nb-4Zr-7.9Sn) is the lowest initial Young's modulus so far. The initial Young's modulus is about 40 GPa,. The average Young's modulus is 20 GPa,. The tensile strength is about 900 MPa,. Excellent biocompatibility and mechanical compatibility with human tissue. Objective: to investigate the biomechanical properties of a new type of spinal pedicle screw internal fixation system with low elastic modulus and compare it with Ti6Al4V pedicle screw. Methods: 60 fresh cadaveric thoracic vertebrae were randomly selected to place a new type of low elastic modulus Ti2448 pedicle screw on one side of the pedicle and Ti6Al4V pedicle screw on the other. The maximum bending load and maximum load displacement, maximum rotation torque and maximum axial pullout force of the two groups of screws were measured. Results and conclusion: there was no significant difference in the maximum bending load, displacement, maximum rotation moment and maximum pullout force between the two groups. The results show that the maximum bending strength, maximum rotation moment and maximum pullout force of the new low elastic modulus Ti2448 pedicle screw internal fixation system are basically consistent with those of Ti6Al4V screw, which can meet the needs of spinal biomechanical internal fixation strength.
【作者单位】：湖南省人民医院骨科;
【分类号】：R687.3;R318.01

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