建立锁骨个性化锁定接骨板模型及有限元分析

Establishment of personalized locking clavicle plate model and finite element analysis

背景:应用有限元分析的方法构建人体骨骼三维立体模型及设计骨外科医疗器械更为精准和快捷。目的:根据锁骨模型建立锁骨锁定接骨板模型,分析在折弯和扭转条件下,评估锁定接骨板有限元模型的应力分布情况。方法:采用64排螺旋CT对青年成年健康男性胸部进行平扫,得到该男性锁骨的二维图像数据,运用Mimics10.0软件将所得数据分析、建立锁骨三维有限元模型,根据锁骨模型运用UG软件建立锁骨锁定接骨板模型。利用abaqus软件评估锁定接骨板分别向下给予200 N的力进行折弯及200 N·mm进行轴向扭转,模拟锁骨锁定钛板的受力情况,进一步对其应力分布进行分析。结果与结论:根据CT扫描原始数据构建的锁骨钛合金接骨板的三维实体模型,与骨的贴合性良好,此模型可通过3D打印技术得到适合单个个体的个性化接骨板。有限元分析结果基本可以模拟接骨板的实际受力情况。直型接骨板和"S"型接骨板在侧方折弯及轴向扭转受力情况下,得出7孔钛板的最大应力分布位于中心孔正中。实际手术操作中,锁骨骨折断端与旷置锁定孔正中存在应力叠加,钛板放置若能避开该应力集中处,可有效避免植入后断板发生,为临床实际操作提供理论指导,并为之后对其他类型钛质接骨板的生物力学分析提供了参考以及技术路线。

BACKGROUND： The finite element analysis method is more accurate and fast to construct the three-dimensional model of the human skeleton and design the bone surgical medical instrument. OBJECTIVE： To establish locking plate model according to the clavicle model, analyze and evaluate stress distribution of locking plate of the finite element model under bending and torsion conditions. METHODS： Chest scan was carried out in a healthy young adult male by adopting 64-row spiral CT and his two-dimensional image data were gotten. The obtained data were analyzed with Mimics 10.0 software to establish the three-dimensional clavicle finite element model. The clavicle locking fixation plate model was established by applying the UG software. The locking fixation plate was evaluated by utilizing the abaqus software when the plate was bent while down to give force of 200 N, and twisted while 200 Nomm, to simulate the force and analyze the stress distribution of the locking plate. RESULTS AND CONCLUSION： Based on the original image parameters provided by CT, this experiment produced a three-dimensional model of the clavical titanium plate which fitted better to bones. This model can obtain a single individual, personalized plate by three-dimensional printing technology. The finite element analysis basically can simulate the actual stress of the plate. For straight plate and ＂S＂-shape plate, in lateral bending and axial torsion loads, the maximum stress distribution of the seven-hole titanium plate is located in the center of the center hole. During actual surgical procedures, clavicle fracture fragments and middle locking hole had stress superposition, If the titanium plate can avoid the stress concentration, it can effectively avoid the occurrence of the broken plate after implantation, provide theoretical guidance for clinical practice, and provide reference and technical route for biomechanical analysis of other types of titanium plate. Subject headings： Titanium; Finite Element Analysis; Tissue Engineering