中国组织工程研究 ›› 2016, Vol. 20 ›› Issue (22): 3294-3300.doi: 10.3969/j.issn.2095-4344.2016.22.014

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

静态有限元法分析基于“裹帘”法外固定拇外翻术后截骨端的稳定性

毕春强1,温建民1,孙卫东1,王丽珍2,毛 瑞2,边 蔷1,温冠楠1,常 程1,张玉亮1,樊瑜波2   

  1. 1中国中医科学院望京医院骨关节二科,北京市 100102;2北京航空航天大学生物与医学工程学院,生物力学与力生物学教育部重点实验室,北京市 100191
  • 修回日期:2016-03-11 出版日期:2016-05-27 发布日期:2016-05-27
  • 通讯作者: 温建民,主任医师,教授,博士生导师,中国中医科学院望京医院骨关节二科,北京市 100102 樊瑜波,教授,北京航空航天大学生物与医学工程学院,生物力学与力生物学教育部重点实验室,北京市 100191
  • 作者简介:毕春强,男,1981年生,山东省荣成市人,汉族,中国中医科学院在读博士,主治医师,主要从事中西医结合治疗骨与关节疾病方面的研究。
  • 基金资助:

    国家自然科学基金资助项目(81273984,81373802)

Static finite element analysis of the stability of osteotomy after hallux valgus surgery based on wrapped curtain method with external fixation

Bi Chun-qiang1, Wen Jian-min1, Sun Wei-dong1, Wang Li-zhen2, Mao Rui2, Bian Qiang1, Wen Guan-nan1, Chang Cheng1, Zhang Yu-liang1, Fan Yu-bo2   

  1. 1Second Department of Orthopedics, Wangjing Hospital of China Academy of Chinese Medical Sciences, Beijing 100102, China; 2Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China
  • Revised:2016-03-11 Online:2016-05-27 Published:2016-05-27
  • Contact: Wen Jian-min, Chief physician, Professor, Doctoral supervisor, Second Department of Orthopedics, Wangjing Hospital of China Academy of Chinese Medical Sciences, Beijing 100102, China Fan Yu-bo, Professor, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China
  • About author:Bi Chun-qiang, Studying for doctorate, Attending physician, Second Department of Orthopedics, Wangjing Hospital of China Academy of Chinese Medical Sciences, Beijing 100102, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81273984, 81373802

摘要:

文章快速阅读: 

 
 

 
文题释义:
“裹帘”法外固定:拇外翻术后,根据“裹帘”法理念,采用“8”字绷带和分趾垫外固定,绷带具有一定的弹性,可根据术后患足肿胀程度进行调节松紧,既保护了血运,又避免了筋伤,“裹帘”法外固定既维持了截骨端骨折稳定、通过分趾垫纠正“筋出槽”,又允许截骨端微动,保持弹性固定,既往在学术上对“裹帘”法外固定维持骨折端稳定和骨折愈合存在一定的争议。
“裹帘”法的弹性固定:“裹帘”法根据小夹板原理,符合尚天裕教授提出的“弹性固定准则”。保持截骨端微动,主要是通过肢体肌肉收缩和负重产生的。Goodship等指出在非刚性固定的条件下,调节骨折处的机械应力环境可影响骨愈合的速度和外骨痂生长范围,骨折断端微动可以促进骨痂形成与钙化。
 
摘要
背景:中西医结合微创技术治疗拇外翻术后基于“裹帘”法采用“8”字绷带和分趾垫外固定,临床应用已久,此法摒弃了植入物内固定和石膏外固定,术后患者即可下地生活自理,但因其允许断端活动可能引起骨折不愈合,曾一度引起学者质疑。近年来随着足部生物力学研究不断完善,使足部有限元模型建立和应用成为现实。
目的:基于静态有限元法分析“裹帘”法“8”字绷带和分趾垫外固定系统对拇外翻截骨端稳定性的影响。
方法:选择青年女性拇外翻志愿者,体质量58 kg,右足拇外翻角24°,第1,2跖骨间角13°,近端关节固定角7°,远端关节固定角7°,利用CT对其右足扫描获得数据,采用ABAQUS软件建立右足拇外翻骨骼有限元模型,并模拟第1跖骨颈部微创截骨基于“裹帘”法外固定,计算截骨端的Von Mises 应力和位移。

结果与结论:①无外固定工况最大应力0.067 MPa,有外固定工况最大应力1.258 MPa,应力主要分布在截骨端的外侧边缘部位;②无外固定工况最大绝对位移0.363mm,有外固定工况最大绝对位移0.716mm,均在Z轴方向位移最大,差异有显著性意义(P<0.01);③无外固定工况最大相对位移值为0.101mm,有外固定工况最大相对位移值为0.046 mm。无外固定时最大相对位移为-0.102 mm,发生在Z轴;有外固定时最大相对位移为0.110 mm,发生在Y轴;④经单因素方差分析,有/无外固定工况4个节点在X轴、Y轴上的相对位移差异无显著性意义(P>0.05);有/无外固定工况4个节点在Z轴上的相对位移差异有显著性意义(P < 0.01)。⑤结果提示,拇外翻术后基于“裹帘”法外固定可有效减小截骨端位移,应力适中,从而保持截骨端弹性固定,有利于骨折愈合。

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: 0000-0003-1177-5808(温建民)

关键词: 骨科植入物, 数字化骨科, “裹帘”法, 微创技术, 截骨端稳定性, 有限元分析, 骨折愈合, 国家自然科学基金

Abstract:

BACKGROUND: Integrated Traditional Chinese and Western Medicine minimally invasive treatment for hallux valgus based on wrapped curtain method with “8”-shaped bandage and sub toe pad external fixation has been used for a long time in the clinic. This method abandons the internal implant fixation and external plaster fixation. After surgery, patients could take care of themselves. However, the activity of the broken end may cause fracture nonunion, which once aroused scholars’ question. Recently, with the continuous improvement of foot biomechanics research, foot finite element model and applications become a reality.

OBJECTIVE: To evaluate the stability of osteotomy after the operation of wrapped curtain method with “8”-shaped bandage and sub toe pad external fixation on the basis of static finite element method.
METHODS: A young female volunteer with hallux valgus was selected, whose body weight was 58 kg, and right foot hallux abductor valgus angle was 24°; intermetatarsal angle was 13°; proximal articulator set angle was 7°; distal articulator set angle was 7°. CT was used to scan the right foot. ABAQUS software was applied to establish a finite element model of right foot hallux valgus bone, and model of the first metatarsal neck minimally invasive osteotomy was simulated based on wrapped curtain method with external fixation. Von Mises stress and displacement at the osteotomy end were calculated.

RESULTS AND CONCLUSION: (1) The maximum stress was 0.067 MPa without external fixation, and the maximum stress was 1.258 MPa with the external fixation. Stress was mainly distributed in the outer edge of the osteotomy. (2) The maximum absolute displacement was 0.363 mm without external fixation, and the maximum absolute displacement was 0.716 mm with external fixation. The two largest displacements were both in the Z-axis direction. Statistical analysis confirmed that the four nodes absolute displacement and stress were significantly different (P < 0.01). (3) The maximum relative displacement was 0.101 mm. The maximum relative displacement was 0.046 mm with external fixation. The maximum relative displacement without external fixation was -0.102 mm and occurred in the Z-axis. The maximum relative displacement with external fixation was 0.110 mm and occurred in the Y-axis. (4) One-way analysis of variance confirmed that the four nodes relative displacements were not statistically significant in X-axis and Y-axis (P > 0.05). The four nodes relative displacements were statistically significant in Z-axis (P < 0.05). (5) These findings suggest that the external fixation based on wrapped curtain method after hallux valgus surgery could effectively reduce osteotomy displacement. The moderate stress and elastic fixation are conducive to fracture healing. 

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: Finite Element Analysis, Fracture Healing, Osteotomy, Tissue Engineering

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