摘要
目的建立精细人体全骨盆及髋臼周围肿瘤缺损后重建的三维有限元模型,探讨腓骨移植联合3种不同内固定重建骨盆环后的应力分布规律。方法采集1例35岁正常男性L3至股骨中段、单侧腓骨及内固定系统的CT数据集,建立人体全骨盆及髋臼周围肿瘤切除后腓骨移植联合钢板(Plates)、椎弓根棒(pedicle-rods,PR)、骶髂棒(sacral-iliac rods,SIR)3种内固定方式模拟重建的有限元模型。模拟双腿站立位,L3椎体表面施加500N的垂直载荷,分析重建后的骨盆、移植腓骨及内固定系统的应力分布情况,并进行评价。结果建立了髋臼周围肿瘤切除后腓骨重建的有限元模型。移植腓骨应力集中多发生在与宿主骨接合处附近,不同内固定系统中,Plates与螺钉或钛棒与螺钉接合部分易发生应力集中;Plates重建时,移植腓骨及健侧股骨颈应力较少发生应力集中;SIR重建时,移植腓骨及健侧骨盆应力集中最明显。结论游离腓骨移植、Plates内固定重建骨盆应力分布与完整状态趋于一致,是修复髋臼周围肿瘤切除术后骨缺损的较好方法;有限元模型可作为骨盆生物力学研究的工具。
Objective To establish sophisticated three-dimensional finite element model of reconstructing the whole pelvis and defects in pelvis caused by the resection of periacetabular tumor,and to research the stress distribution regularity of the pelvis reconstructed by the fibular transplantation through three different internal fixation techniques.Methods The CT datasets including L3 to middle-femur,unilateral fibular and internal fixation system from 1 healthy 35-year-old male volunteer were collected to establish finite element models of reconstructing the pelvis after the resection of periacetabular tumors through 3 different internal fixation means,namely fibular with plates,pedicle-rods and sacral-iliac rods.Bilateral leg standing position was simulated,then vertical load of 500 N was imposed on the surface of L3,the stress distribution regularity of reconstructed pelvis,transplanted fibular and internal fixation system were evaluated.Results The finite element models of the pelvis reconstruction after resection of periacetabular tumors were established.The stress concentration of transplanted fibular was extremely high in the vicinity of the host junction sites.For the three internal fixation systems,the connection between steel plate and screw or between titanium bar and screw inclined to have stress concentration;and when the titanium bar was adopted to reconstruct,the transplanted fibular and the healthy side of femoral neck had less stress concentration,while sacral-iliac rods had the most obvious stress concentration.Conclusion For the reconstruction pelvis,the three fibula transplantation and steel plate internal fixation are consistent with intact state of pelvis in terms of the stress distribution,which is a relatively good method for the treatment of bone defect after periacetabular tumor.The finite element model can be used as a tool for the pelvis biomechanics research.
出处
《中国修复重建外科杂志》
CAS
CSCD
北大核心
2010年第4期472-476,共5页
Chinese Journal of Reparative and Reconstructive Surgery
关键词
髋臼周围肿瘤
Ⅱ型切除重建
有限元模型
应力分布
Periacetabular tumor Type II resection and reconstruction Finite element model Stress distribution
