中国组织工程研究

中国组织工程研究 ›› 2011, Vol. 15 ›› Issue (52): 9729-9733.doi: 10.3969/j.issn.1673-8225.2011.52.009

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

前路钢板置入固定治疗骶髂关节脱位的三维有限元分析

肖  进1，尹庆水1，张美超2，赵卫东2，李鉴轶2   

  1. 1解放军广州军区广州总医院骨科医院，广东省广州市   510010
    2南方医科大学临床解剖学研究所，广东省广州市   510515
  • 收稿日期:2011-05-31 修回日期:2011-08-11 出版日期:2011-12-24 发布日期:2011-12-24
  • 作者简介:肖进☆，男，1973年生，湖南省望城县人，汉族，2008年南方医科大学毕业，博士，主要从事骨科、足踝外科、数字骨科学研究。

Three-dimensional finite element analysis of anterior plate fixation for the treatment of sacroiliac joint dislocation

Xiao Jin1, Yin Qing-shui1, Zhang Mei-chao2, Zhao Wei-dong2, Li Jian-yi2   

  1. 1Hospital of Orthopedics, Guangzhou General Hospital of Guangzhou Military Command of Chinese PLA, Guangzhou  5100510, Guangdong Province, China
    2Institute of Clinical Anatomy, Southern Medical University, Guangzhou  510515, Guangdong Province, China
  • Received:2011-05-31 Revised:2011-08-11 Online:2011-12-24 Published:2011-12-24
  • About author:Xiao Jin☆, Doctor, Hospital of Orthopedics, Guangzhou General Hospital of Guangzhou Military Command of Chinese PLA, Guangzhou 5100510, Guangdong Province, China xiaojinhn@yahoo.com.cn

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被引次数

1

摘要：

背景：已有文献报道骶髂关节损伤及固定的生物力学研究，但多是在尸体标本或人工骨模型上模拟骶髂关节损伤。
目的：利用三维有限元方法对骶髂关节脱位前路钢板内固定的垂直稳定性进行分析。
方法：在完整骨盆三维有限元模型的基础上，建立一侧骶髂关节脱位后前路钢板内固定模型。对模型施加500 N轴向载荷，经计算得到应力、应变及位移云图，并与完整骨盆的同一工况进行比较分析。
结果与结论：在内固定系统处出现了应力集中现象，尤其以靠近骶髂关节的螺钉周围应力最大，远远大于完整骨盆同一工况下的最大应力。应变以健侧骶髂关节最大，内固定侧骶髂关节无应变。位移以损伤侧骶髂关节处最大，约为完整骨盆的2倍。提示前路钢板内固定治疗骶髂关节脱位，骨盆在垂直方向上稳定性较差，且钢板螺钉处出现了应力集中现象。

关键词: 骶髂关节脱位, 前路钢板, 骨盆, 有限元分析, 生物力学

Abstract:

BACKGROUND: Most reported biomechanical studies on sacroiliac joint injury and fixation use cadavers or artificial bone models to simulate the sacroiliac joint injury.
OBJECTIVE: To analyze the vertical stability of anterior plate fixation for sacroiliac joint dislocation using three-dimensional finite element method.
METHODS: The anterior plate fixation model of unilateral sacroiliac joint dislocation was constructed on the basis of the three-dimensional finite element model of a complete pelvis. An axial load of 500 N was applied on the model; the cloud pictures of stress, strain and displacement were obtained after calculation and compared with that of the complete pelvis under the same conditions.
RESULTS AND CONCLUSION: Stress concentration occurred at the internal fixation system; the maximum stress was found at the screws near the injured sacroiliac joint, far greater than the maximum stress of the complete pelvis under the same condition. The maximum strain was found in the healthy sacroiliac joint; the fixed sacroiliac joint had no strain. The maximum displacement was found in the injured sacroiliac joint; it was about twice longer than the complete pelvis. These findings indicate that the vertical stability of pelvis is poor using anterior plate internal fixation treatment for sacroiliac joint dislocation; and stress concentration occurs at the screws and plates.

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