中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (7): 1090-1095.doi: 10.3969/j.issn.2095-4344.0122

• 骨与关节生物力学 bone and joint biomechanics • 上一篇    下一篇

三维有限元分析大转子骨瓣转移治疗股骨头缺血坏死应力分布变化

张天一1,2,董 巍1,米盼盼1,孔繁林1,朱 军1,吴建伟1,乔金环1,樊国峰1,田丰德2   

  1. 1中国石油中心医院骨科,河北省廊坊市  0650002大连大学附属中山医院,辽宁省大连市  116001
  • 出版日期:2018-03-08 发布日期:2018-03-08
  • 通讯作者: 樊国峰,硕士,主任医师。中国石油中心医院骨科,河北省廊坊市 065000
  • 作者简介:张天一,男,1987年生,河北省廊坊市人,汉族,2013年大连大学毕业,硕士,医师,主要从事骨坏死的修复与再造研究。
  • 基金资助:

    国家自然科学基金(30670542)

Three-dimensional finite element analysis on stress distribution after greater trochanter bone flap for treating osteonecrosis of the femoral head  

Zhang Tian-yi1, 2, Dong Wei1, Mi Pan-pan1, Kong Fan-lin1, Zhu Jun1, Wu Jian-wei1, Qiao Jin-huan1, Fan Guo-feng1, Tian Feng-de2   

  1. 1Department of Orthopedics, China National Petroleum Corporation Central Hospital, Langfang 065000, Hebei Province, China; 2Affiliated Zhongshan Hospital, Dalian University, Dalian 116001, Liaoning Province, China
  • Online:2018-03-08 Published:2018-03-08
  • Contact: Fan Guo-feng, Master, Chief physician, Department of Orthopedics, China National Petroleum Corporation Central Hospital, Langfang 065000, Hebei Province, China
  • About author:Zhang Tian-yi, Master, Resident physician, Department of Orthopedics, China National Petroleum Corporation Central Hospital, Langfang 065000, Hebei Province, China; Affiliated Zhongshan Hospital, Dalian University, Dalian 116001, Liaoning Province, China
  • Supported by:

     the National Natural Science Foundation of China, No. 30670542

摘要:

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文题释义:
股骨大转子区:是股骨上端隆起部分,主要以松质骨为主,皮质骨较薄,与股骨头结构骨质相似。
有限元单元法:可计算股骨头的应力、应变,并可改变其中的任意参数,观察其对完整结构的影响,所以能够解释股骨头生理或病理过程中的各种力学变化。
 
摘要
背景:三维有限元分析已经被较多骨科学者应用,但作为股骨头坏死保髋治疗术后评价结果不一。
目的:研究运用三维有限元方法检测大转子骨瓣转移治疗股骨头坏死后股骨头的生物力学变化及股骨近端生物力学改变,验证该术式力学安全性及有效性。
方法:选取1例单侧股骨头坏死ARCOⅢ期患者并行带血管蒂大转子骨瓣移植术患者,根据术前及术后6个月股骨近段的计算机断层成像技术CT数据,以DICOM格式保存,用计算机辅助技术及专业医学建模软件MIMICS及HYPERMESH建立股骨近段三维几何模型分为正常组、坏死组及修复组三维有限元模型。应用有限元分析软件ANSYS模拟人体站立及运动等不同情况,将模型自由网格划分,赋予材料参数,建立正常股骨近段,股骨头坏死骨缺损和运用大转子骨瓣转移修复骨缺损的三维有限元模型。载荷加载于不同的有限元模型,观察3组模型股骨头的最大位移和股骨近段的应力分布情况。
结果与结论:①在同一载荷下,此3组模型的最大位移值分别为:正常组0.61 mm,坏死组0.66 mm,修复组0.61 mm;坏死模型的最大Von Mises应力值远大于正常模塑。修复模型的最大Von Mises应力值逐渐降低,与正常值接近;②此3组模型均提示股骨颈区小转子上方出现应力集中,在转子位置的最大应力,坏死模型较正常增高,而修复后该处的最大应力值逐渐增高,但仍低于骨的破坏应力;③结果证实,运用大转子骨瓣转移修复股骨头坏死骨缺损后的股骨头的最大应力值及最大位移值更接近正常,大转子区作为修复股骨头骨缺损的骨瓣供区是安全可靠的。
 
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
ORCID: 0000-0001-6553-2516(张天一)

关键词: 股骨头坏死, 生物力学, 大转子骨瓣, 三维有限元, 应力, 股骨近端, Von Mises应力值, 组织工程

Abstract:

BACKGROUND: Three-dimensional finite element analysis has been used by many scholars from department of orthopedics, but the results of postoperative evaluation of hip preserving treatment for osteonecrosis of femoral head are different.

OBJECTIVE: To study the biomechanical changes of the femoral head and the biomechanical changes of the proximal femur after greater trochanter bone flap for the treatment of femoral head necrosis using three-dimensional finite element method, and to verify the mechanical safety and effectiveness.
METHODS: One case of unilateral femoral head necrosis in ARCOIII stage undergoing parallel vascularized greater trochanter bone flap transplantation was selected. Computed Tomography data of proximal femur were collected before and 6 months after the operation, and preserved in DICOM format. With the aid of computer technology, professional medical modeling software, MIMICS and HYPERMESH, were used to establish the three-dimensional geometric models of the proximal femur. These models were divided into normal group, necrosis group and repair group. Finite element analysis software ANSYS was utilized to simulate human body standing and movement in different situations. The model was divided by free mesh, and given material parameters to establish normal proximal femur, femoral head necrosis and bone defect. Greater trochanter bone flap was applied in repairing three-dimensional finite element model of bone defect. Loads were loaded on different finite element models. The maximum displacement of the femoral head and the stress distribution in the proximal femur of the three groups were observed under different loading models.
RESULTS AND CONCLUSION: (1) Under the same load, the maximum displacement of the three sets of models was 0.61 mm in the normal group, 0.66 mm in the necrosis group, and 0.61 mm in the repair group, respectively. Maximum Von Mises stress was greater in necrosis model than in the normal molding. The maximum Von Mises stress gradually decreased in the repair model, and was close to normal value. (2) Three groups of models showed stress concentration above the rotor in femoral neck region. The maximum stress in the trochanteric position was higher in necrosis models than in normal models. The maximum stress in this region gradually increased after repair, but was still lower than the failure stress of bone. (3) The results confirm that the maximum stress and the maximum displacement are closer to the normal value after greater trochanter bone flap for treatment of osteonecrosis of the femoral head. The greater trochanter is safe and reliable for repairing bone defect of femoral head.

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: Tissue Engineering, Femur Head Necrosis, Biomechanics

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