中国组织工程研究

中国组织工程研究 ›› 2012, Vol. 16 ›› Issue (13): 2300-2304.doi: 10.3969/j.issn.1673-8225.2012.13.005

• 人工假体 artificial prosthesis • 上一篇    下一篇

组配式人工半骨盆假体置换后骨盆站立位生物力学有限元分析★

廉士海1，屠重棋2，张  强1，梁  磊1，段  宏2，周  勇2   

  1. 1枣庄市立医院，山东省枣庄市  277100；2四川大学华西医院骨科，四川省成都市 610041
  • 收稿日期:2011-12-16 修回日期:2012-02-14 出版日期:2012-03-25 发布日期:2012-03-25
  • 通讯作者: 屠重棋，教授，博士生导师，四川大学华西医院骨科，四川省成都市 610041 tuchongqi@163.com
  • 作者简介:廉士海★，男，1975年生，山东省枣庄市人，汉族，硕士，主治医师，主要从事骨科方面的研究。xiaozhualian@163.com

Biomechanical finite element analysis of the pelvic in a standing position following modular hemipelvic prosthesis replacement  

Lian Shi-hai1, Tu Chong-qi2, Zhang Qiang1, Liang Lei1, Duan Hong2, Zhou Yong2   

  1. 1Zaozhuang Municipal Hospital, Zaozhuang  277100, Shandong Province, China; 2Department of Orthopedics, West China Hospital of Sichuan University, Chengdu  610041, Sichuan Province, China
  • Received:2011-12-16 Revised:2012-02-14 Online:2012-03-25 Published:2012-03-25
  • Contact: author: Tu Chong-qi, Professor, Doctoral supervisor, Department of Orthopedics, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China tuchongqi@163.com
  • About author:Lian Shi-hai★, Master, Attending physician, Zaozhuang Municipal Hospital, Zaozhuang 277100, Shandong Province, China xiaozhualian@163.com

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摘要：

背景：目前关于骨盆生物力学有限元分析主要是针对正常和外伤后的骨盆，缺乏对Enneking Ⅱ区的恶性肿瘤切除、组配式人工半骨盆假体重建骨盆环缺损后骨盆生物力学模型进行三维有限元分析。
目的：观察正常骨盆及半骨盆切除、组配式人工半骨盆假体置换后患者站立体位下应力分布。
方法：采用CT薄层扫描采集1例半骨盆切除、组配式人工半骨盆假体置换后17个月患者的骨盆原始数字影像和通信标准数据，将数据导入Mimics 8.1软件建立三维实体模型，再将实体模型导入Abaqus 6.7-1分析软件，分别以正常骨盆及组配式人工半骨盆假体置换后的骨盆，建立三维有限元模型，并分别对双脚站立、患侧单脚站立两种静力状态下进行生物力学加载并对结果进行分析。
结果与结论：在正常骨盆及组配式人工半骨盆假体置换后骨盆2种有限元模型中，不同站立体位相同载荷下健侧骨盆应力值接近；患侧组配式半骨盆假体不同站立体位时应力最大值均出现在髋臼杯上方CS脊柱内固定器与髋臼杯连接部内侧，所受最大应力均远低于其疲劳强度；组配式半骨盆假体重建后骨盆站立位时应力的分布规律与正常骨盆基本一致。说明：①组配式人工半骨盆假体置换对健侧骨盆影响较小。②站立体位下组配式人工半骨盆假体安全性好。③组配式人工半骨盆假体重建后的骨盆符合人体正常生物力学规律，具有良好的生物力学相容性基础。

关键词: 组配式, 半骨盆假体, 站立, 生物力学, 有限元

Abstract:

BACKGROUND: At present, the finite element analysis of the pelvic biomechanics is mainly on the normal and post-traumatic pelvis. However, the three-dimensional finite element analysis of the pelvic biomechanics following malignant tumor resection and reconstruction of pelvic ring defects with modular hemipelvic prosthesis replacement is rare.
OBJECTIVE: To research and analyze the stress distribution in a standing position about the normal pelvis, postoperative contralateral pelvic and modular hemipelvic prosthesis replacement.
METHODS: First, the original digital imaging and communications standard data of the pelvis in patients with hemipelvic resection and modular hemipelvic prosthesis replacement were obtained by thin-layer CT scanning, and then the data were transferred into the Mimics8.1 software to set up three-dimensional solid model. The solid model was established by Abaqus6.7-1 analysis software. By means of the normal pelvis and after modular hemipelvic prosthesis replacement, the three-dimensional finite element models of the pelvis were set up respectively. The stress in different standing positions, including two legs standing and one leg standing, was loaded in finite element models and the results in finite element models were analyzed.
RESULTS AND CONCLUSION: In the kinds of models, the difference of contralateral pelvic stress value was small under the same load in different standing positions. The maximum stress of modular hemipelvic prosthesis in the ipsilateral pelvic at different standing positions appeared on the inner wall of connector bar between CS spinal fixation at the top of acetabular cup and acetabular cup. It is much lower than the fatigue strength of connector bar. The stress distribution of the pelvic at different standing positions after prosthesis replacement was basically consistent with the normal pelvis. ①It demonstrates that the effect of modular hemipelvic prosthesis replacement on contralateral pelvis is less. ②Modular hemipelvic prosthesis has good security at different standing positions. ③The pelvis after modular hemipelvic prosthesis reconstruction is consistent with the normal laws of human biomechanics, and has a good biomechanical compatibility. 

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