髋臼后柱骨折经皮拉力螺钉固定的数字化模拟与有限元分析.doc

髋臼后柱骨折经皮拉力螺钉固定的数字化模拟与有限元分析.doc安徽医科大学硕士学位论文
大小相似, 疏密得当,无畸形三角片, 全部质量检测合格,模型能从力学上代表实
物。
2 有限元模型求解
本实验尝试对髋臼后柱骨折拉力螺钉固定的模型进行受力分析,锁定骶髂关
节和耻骨联合,模拟***站立位时头臼之间的作用力对模型进行加载,载荷大小
设定为1/2体重(300牛)、1倍体重(600牛)、2倍体重(1200牛)、4倍体重(2400
牛)、6倍体重(3600牛)、8倍体重(4800牛)、10倍体重(6000牛)。求解后发现:
从上到下,位移量逐渐增大,最大位移位于坐骨支,最小位移位最上端,螺钉的
最大位移位于最下端,最小位移位于最上端。主应变集中于髋臼前下壁,螺钉应
变集中于后柱段以及跨越骨折线的部位。主应力集中在髋臼前下壁、耻骨上支、
螺钉跨越骨折线的部位,螺钉应力集中在后柱段及跨越骨折线的部位。
结论
1 施加载荷后最大位移位于坐骨支,最大应变和最大应力位于髋臼前下方。
2 以坐骨结节中心为进针点行拉力螺钉治疗髋臼后柱骨折在解剖上具有可行性,
髋臼后柱能够容纳多种规格的拉力螺钉。
3 经皮拉力螺钉单独固定能维持伤髋的复位和稳定性,在生物力学方面具有可行
性,可独立将其应用于髋臼后柱骨折的治疗。
关键词:髋臼骨折后柱拉力螺钉有限元分析
9
安徽医科大学硕士学位论文
Digital simulation and finite element analysis for the
percutaneous retrograde screw fixation of acetabular fractures
Abstract
As treatment of acetabular fractures gold standard , the ings of the fixed cut is
constantly reset cause more trauma surgeon 's attention , prompting trauma surgeon
constantly explore new alternative to cut fixed or partial replacement therapy for the
reset . Fixation is minimally invasive screw force by Pilar rise in recent years of new
technology , and is widely used in column fracture of the acetabulum in which
pre-treatment technology is already quite mature , compared with the traditional fixed
open reduction and plate and screw , by fixed with less trauma , less bleeding ,
exposing a small area , percutaneous surgery a short time, the advantages of fixed
exact intradermal screws. Avoid damage to the surrounding soft tissue , is conducive to
healing ; fixed precise and reliable, is conducive to early functional exercise ; fewer
complications. Intraoperative C-arm X-ray machine navigation has e a relatively
mature technology-assisted surgery , while more advanced three-dimensional real-time
navigation technology has started and are ing increasingly popular among the
objects placed in position and continuously improve the controllability Traveling ,
controlled the entire operation , surgical accuracy has been a qualitative leap.
Minimally invasive , prec