Three-dimensional simulation and simulated mechanical test of individual femoral prosthesis

doi:10.3969/j.issn.2095-4344.0171

Abstract

Abstract:

BACKGROUND: A study combined medical CT technology and digital three-dimensional (3D) interactive control system Mimics software and computer simulation software tools for 3D reconstruction and simulation reconstruction of the femur. Customized individualized femoral prosthesis has high matching degree with human body structure, and has high application value in clinical research.

OBJECTIVE: To investigate the application value of 3D simulation of femoral prosthesis in artificial femoral prosthesis replacement.

METHODS: Totally 82 cases, who received femoral prosthesis replacement from July 2014 to June 2016 in Taihe Hospital of Shiyan, were enrolled and randomly assigned to three groups: personalized group (n=28), cementless group (n=27) and cemented group (n=27). Different types of femoral prosthesis were designed in each group. 3D model reconstruction in femur was designed using medical CT technology combined with computer. Prosthesis implantation was simulated in computer, and the relevant information was recorded. Simulated operation was conducted on the mechanical experiment of femoral prosthesis in the biped and single foot loads so as to provide the most suitable operation plan. The possible risk was forecasted and assessed for preoperative preparation.

RESULTS AND CONCLUSION: (1) In the simulation of mechanical experiment, under double foot and single foot loads, after prosthetic replacement, stress in the femur was significantly better in the personalized group than in the cementless group and cemented group (P < 0.05). (2) After replacement, normal stress and shear stress were significantly better in the personalized group than in the cementless group and cemented group (P < 0.05). (3) The initial, horizontal and vertical micromovement was significantly better in the personalized group than in the cementless group and cemented group (P < 0.05). (4) In summary, the use of computer technology and 3D CT software can make individualized femoral prosthesis for patients. Compared with the cementless and cemented prostheses, personalized prosthesis has obvious advantages in stress distribution, interface stress and initial micromovement.

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: Computer-Aided Design, Finite Element Analysis, Prosthesis Implantation, Tissue Engineering

CLC Number:

R318

Li Kang, Jiang Yan, Tian Da-wei, Liu Xiang-yang. Three-dimensional simulation and simulated mechanical test of individual femoral prosthesis[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(11): 1731-1736.

Figures/Tables 3

2.2 基线资料比较 3组基线资料比较差异无显著性意义(P > 0.05)，具有可比性，见表1。 2.3 不同材料的特性利用有限元分析软件ANSYS对完整股骨及股骨假体间接触配合进行分析时，共提及以下4种材料，4种不同材料的弹性模量、泊松比与剪切模量进行分析比较，差异有显著性意义(P < 0.05)，见表2。 2.4 假体置换后假体和股骨上的应力情况如表3所示，个性化组与生物型组与骨水泥型组进行分析比较，假体应力情况与股骨应力情况通过F 检验，P < 0.05。个性化假体应力最小，生物型和骨水泥型假体应力较大。双足站立载荷下，个性化假体应力比生物型和骨水泥型假体应力平均减少72%和73%；个性化假体的股骨上应力分别比生物型和骨水泥型假体应力平均减少77%和79%。单足站立载荷下，个性化假体应力生物型和骨水泥型假体应力平均减少33%和57%；个性化假体的股骨上应力分别比生物型和骨水泥型假体应力平均减少77%和80%。3组相比差异有显著性意义(P < 0.05)。示意图见图3。 2.5 假体置换后的正应力与剪切应力情况如表4所示，在对个性化组与2个对照组进行力学模拟试验过程中，个性化组与2个对照组在正应力与剪切应力方面通过F 检验， P 。个体化假体界面应力最小，生物型和骨水泥型假体界面应力较大。< 0.05 双足站立载荷下，正应力个性化假体分别比生物型和骨水泥型假体应力平均减少48%和55%；剪切应力个性化假体分别比生物型和骨水泥型假体应力平均减少83%和 80%。单足站立载荷下，正应力个性化假体分别比生物型和骨水泥型假体应力平均减少15%和45%；剪切应力个性化假体分别比生物型和骨水泥型假体应力平均减少54%和 72%。3组相比差异有显著性意义(P < 0.05)。 "

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