摘要
目的 通过有限元方法研究径向梯度和均质化两种结构多孔假体对胫骨应力传导的影响。方法 基于逆向工程技术构建胫骨模型,设计孔棱直径呈梯度变化的仿生骨小梁结构假体和均质化仿生骨小梁结构假体。利用Vicon动捕平台获取的人体步态及屈曲时胫骨-股骨关节轴向作用力,作为边界条件导入ANSYS Workbench进行力学性能分析。结果 近端缺损情况下,径向梯度结构假体使骨骼von Mises应力提升3.68 MPa,远端缺损情况下提升7.34 MPa;与均质化结构假体相比,近端和远端缺损情况下von Mises应力分别平均降低171、190.4 MPa。结论 径向梯度结构假体的应力沿假体从外侧向中间高孔隙率区域扩散,可有效传递胫骨平台载荷,降低假体应力集中,提高骨骼应力,延长假体服役寿命。研究结果为临床假体置换提供理论参考。
Objective To study the effects of porous prothesis with radial gradient and homogenized structures on stress transmission in the tibia by using finite element method.Methods Based on the reverse engineering technology,the tibial model was constructed,and the bionic trabecular bone structure prosthesis with gradient change of pore edge diameter and the homogeneous bionic trabecular bone structure prosthesis were designed.The Vicon dynamic capture platform was used to obtain the human gait and the axial force of the tibia-femoral joint during flexion,which was imported into ANSYS Workbench as a boundary condition for mechanical performance analysis.Results In the case of proximal defect,the von Mises stress of the bone for prosthesis with radial gradient structure was increased by 3.68 MPa,and that in the case of distal defect was increased by 7.34 MPa.Compared with the homogenized prosthesis,the von Mises stress of the proximal and distal defects was decreased by 171 MPa and 190.4 MPa,respectively.Conclusions The stress of the radial gradient structure prosthesis diffuses from the outside to the middle high porosity area along the prosthesis,which can effectively transfer the tibial plateau load,reduce stress concentration of the prosthesis,improve bone stress and prolong service life of the prosthesis.This study provides a theoretical reference for clinical prosthesis replacement.
作者
徐志国
海几哲
单春龙
徐庆宇
王海旭
李海杰
XU Zhiguo;HAI Jizhe;SHAN Chunlong;XU Qingyu;WANG Haixu;LI Haijie(College of Intelligent Manufacturing Modern Industry,Xinjiang University,Urumqi 830000,China)
出处
《医用生物力学》
北大核心
2025年第4期908-915,共8页
Journal of Medical Biomechanics
基金
国家自然科学基金项目(52165026)。
关键词
胫骨感染性骨缺损
径向梯度
均质化
仿生骨小梁
多孔假体
生理载荷
tibial infectious bone defect
radial gradient
biomimetic trabecular bone
porous prosthesis
physiological load
