中文摘要：

目的利用CT三维重建和逆向工程技术，探讨个性化顺行髋臼前柱拉力螺钉固定治疗髋臼前柱骨折的最优钉道，并在标本进行有限元验证。方法获取1位健康成年男性志愿者骨盆CT薄层扫描数据，将原始Dicom格式数据导入Materialise Mimics Innovation Suite16．0软件进行骨盆三维重建，截取半个髋骨数据并以.stl文件格式存储。根据拉力螺钉的几何尺寸及力学参数，在Solidwoks2012软件中绘制出螺钉模型，螺钉直径为7．3mm，长度120mm，导入Geomagic 2014软件进行光顺及去噪处理；用UG Imageware 12．0软件将髋臼前柱和拉力螺钉进行装配，设计出几何钉道，与“in-out-in”钉道、自由钉道在髋骨标本上验证。将钉道模型数据导入Ansys 12．0软件，建立骨性结构的有限元模型，定义上部躯体重力负荷（分别为600N、1200N、2400N），测定未置入螺钉及置入直径为120mm螺钉时半骨盆和螺钉的Von Mises应力峰值和形变量，最后确定最优钉道。结果分别加载600N、1200N、2400N的力至正常髋骨和按几何钉道、“in-out-in”钉道及自由钉道置入螺钉后的髋骨，随着给予载荷力的加大，髋骨所受应力及髋骨形变量逐渐加大，其中置入螺钉后的髋骨所受应力稍高于正常髋骨，按几何钉道和“in-out-in”钉道螺钉置入螺钉的髋骨所受应力相差不大，而按自由钉道置入螺钉的髋骨所受应力较前两者明显增加，各组中髋骨形变量无明显差别。分别加载600N、1200N、2400N的力至按几何钉道、“in-out-in”钉道及自由钉道置入螺钉后的髋骨时，随着所给载荷力的加大，螺钉所受应力及形变量逐渐加大，其中按几何钉道置入的螺钉所受应力较按“in-out-in”钉道及自由钉道置入的螺钉所受应力明显减小，按“in-out-in”钉道置入的螺钉所受应力最大。结论通过有限元分析与验证，几何钉道中螺钉发生应力集中和位?

英文摘要：

Objective To explore the optimal screw fixation of anterior column lag screw fixation in the treatment of acetabular anterior column fractures by finite element method. Methods Firstly, CT scanning images from one healthy adult volunteer （male 30）, were transferred into Materialise Mimics Innovation Suite 16.0 software, then three-dimensional （3D） models of pelvic were reconstructed and stored in stereolithography format. Then Imageware 12.0 software （EDS, USA） was used to produce the optimal and safe channel of the screw for acetabulum anterior column fixation. Three types of screw fixation were generated, i.e. （1） geometric algorithm screw channel, （2） ＂in-out-in＂ channel, （3） free screw channel. Secondly, all model data were transferred into Ansys 12.0 software to establish the finite element model. Gravity load were defined as 600 N, 1 200 N, and 2 400 N, and the Von Mises the parameters of peak stress and deformation were recorded. Results Respectively load of 600 N, 1 200 N, 2 400 N force to normal hip and geometric algorithm screw channel, ＂ in-out-in ＂ screw channel, free screw channel, the comparison between groups of hip by stress and hip deformation, with a given loading force of hip by stress and hip deformation increase gradually, the two were positively correlated, including screw by stress at slightly higher than that of normal hip, while the stress of hip by geometric algorithm screw channel and ＂ in-out-in ＂ screw channel were similar, and that by free screw channel increased significantly. There was no significant difference between groups in the hip deformation. With a given loading force （600 N, 1 200 N, 2 400 N） on geometric algorithm screw channel,＂ in-out-in ＂ screw channel and free screw channel, the deformation is gradually increased, and there were positively correlated. With the stress on geometric algorithm screw channel, it was significantly reduced compared with the latter two, and ＂in-out-in＂ screw channel suffered the biggest stress.