中文摘要：

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0．067MPa，有外固定工况最大应力1．258MPa，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0．046mm。无外固定时最大相对位移为-0．102mm，发生在Z轴；有外固定时最大相对位移为0．110mm，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。

英文摘要：

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 m