中国组织工程研究

中国组织工程研究 ›› 2012, Vol. 16 ›› Issue (9): 1626-1630.doi: 10.3969/j.issn.1673-8225.2012.09.025

• 数字化骨科 digital orthopedics • 上一篇    下一篇

微型外固定支架和克氏针治疗Bennett骨折的三维有限元分析*★

孟立民1，苏啸天2，张银光3，陆  芸4   

  1. 1天津医科大学研究生院，天津市  300070；2天津市泰达医院骨外科，天津市 300457；天津市天津医院，3创伤骨外科，   4显微手外科，天津市  300211
  • 收稿日期:2011-09-18 修回日期:2011-10-17 出版日期:2012-02-26 发布日期:2012-02-26
  • 通讯作者: 陆芸，主任医师，硕士生导师，天津市天津医院显微手外科，天津市 300211
  • 作者简介:孟立民★，男，1981年生，河北省大城县人，汉族，天津医科大学在读硕士，主要从事显微手外科科专业的研究。 menglimin@hotmail.com
  • 基金资助:

    天津市卫生局科技基金项目(10JCYBJC13900)，课题的名称：小关节假体植入物碳/碳复合材料的研究。

Three-dimensional finite element analysis of mini-external fixation and Kirschner wire internal fixation for the treatment of Bennett fracture

Meng Li-min1, Su Xiao-tian2, Zhang Yin-guang3, Lu Yun4   

  1. 1Graduate School of Tianjin Medical University, Tianjin  300070, China; 2Department of Orthopaedics, Teda Hospital, Tianjin  300457, China; 3Department of Orthopedic Trauma, Tianjin Hospital, Tianjin  300211, China; 4Department of Hand Microsurgery, Tianjin Hospital, Tianjin  300211, China
  • Received:2011-09-18 Revised:2011-10-17 Online:2012-02-26 Published:2012-02-26
  • Contact: Lu Yun, Chief physician, Master’s supervisor, Department of Hand Microsurgery, Tianjin Hospital, Tianjin 300211, China
  • About author:Meng Li-min★, Studying for master’s degree, Graduate School of Tianjin Medical University, Tianjin 300070, China menglimin@hotmail.com
  • Supported by:

    Technology Fund of Tianjin Health Bureau, No. 10JCYBJC13900*

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摘要：

背景：有限元分析能够模拟骨外科手术方式，并对模型进行生物力学分析，此方法被认为是一种重要的、新的骨外科生物力学分析方法。
目的：利用三维有限元法分析微型外固定器和克氏针治疗Bennett骨折的稳定性。
方法：获取健康男性志愿者左手及桡骨远端骨CT扫描信息，利用Mimics软件对第一、二掌骨和大多角行三维建模，并对克氏针和微型外固定器材造模；所有数据以STL格式输出到Geomagic软件编辑，得到模型实体，把所有数据以IGES格式输出；之后导入到Aansys软件中，模拟Bennett骨折和微型外固定器外固定及克氏针内固定治疗模型，分别对模型赋予单元类型和属性建立有限元模型。在两个模型的第一掌骨头相同节点处分别施加50 N压力行非线性分析。
结果与结论：微型外固定器治疗Bennett骨折远端骨折块最大移位：X方向位移是-0.492 mm，总位移是0.638 mm；近端骨折块最大位移X方位移是-0.34 mm，总位移是0.659 mm，远近骨折块最大相对位移X方位移是0.15 mm，总位移是0.033 mm。克氏针内固定治疗Bennett骨折远端骨折块最大移位是：X方向位移是-2.873 mm，总位移是5.361 mm；近端骨折块最大位移X方位移是-2.546 mm，总位移是4.294 mm；远近骨折块最大相对位移X方位移是0.676 mm，总位移是1.667 mm。数据表明微型外固定器材外固定治疗Bennett骨折的稳定性优于克氏针内固定治疗，前者降低了术后创伤性关节炎的发生率。
关键词：微型外固定器；克氏针；Bennett骨折；第一掌骨基底骨折；三维有限元；生物力学分析
doi:10.3969/j.issn.1673-8225.2012.09.025
 

关键词: 微型外固定器, 克氏针, Bennett骨折, 第一掌骨基底骨折, 三维有限元, 生物力学分析

Abstract:

BACKGROUND: Finite element analysis can be applied in imitate orthopaedic operations and biomechanics of orthopaedic model. Finite element analysis has been considered as an important and new method in surgery for orthopaedic biomechanics research.
OBJECTIVE: To analyze the stability of Bennett fracture treated by mini-external fixation and Kirschner wire (k-wire) internal fixation using the finite element analysis.
METHODS: CT Images of the left distal radius from 25 healthy male volunteers were analyzed in order to build three-dimensional models of the first metacarpal, the second metacarpal, and the trapezium, as well as the model of k-wire and mini-external fixation devices by Mimics software. All the data were output in STL style and then input into Geomagic software to build model entities which were output in IGES form. Finally, the data were input in Aansys software to simulate Bennett fracture and establish treatment models of mini-external fixation and k-wire internal fixation. Finite element models were built following unit type and property were given to the two models. Nonlinear analysis was performed in the two models under the same load (50 N) at the same point of the first metacarpal.
RESULTS AND CONCLUSION: The max displacements of the fracture piece of the mini-external fixation treatment model: X-component displacement was -0.492 mm for the distal end and -0.34 mm for the proximal end, and displacement vector in sum was 0.638 mm for the distal end and 0.659 mm for the proximal end. Relative displacements of the distal and proximal fracture ends: X-component displacement was 0.15 mm, and displacement vector in sum was 0.033 mm. The max displacements of the fracture piece of the k-wire internal fixation model: X-component displacement was -2.873 mm for the distal end and -2.546 mm for the proximal end, and displacement vector in sum was 5.361 mm for the distal end and 4.294 mm for the proximal end. Relative displacements of the distal and the proximate pieces of fracture: max X-component displacement was 0.676 mm and displacement vector in sum was 1.667 mm. The consequences indicate that the fixation stability of Bennett fracture treated by mini-external fixation is better than that by k-wire internal fixation. The former one can reduce the incidence of traumatic arthritis after treatment.

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