改良Galveston技术与拉力螺钉固定单侧骶髂关节脱位的有限元分析  

Modified Galveston technique anlag screw fixation for dislocation of the unilateral sacroiliac joint： a finite element analysis

作　　者：贾谊[1] 王钢[1] 陈滨[1] 杨运平[1] 秦煜[1] 李岗[1] 刘善宇[1] 

机构地区：[1]南方医科大学南方医院创伤骨科,广州510515

出　　处：《中华创伤骨科杂志》2011年第5期459-462,共4页Chinese Journal of Orthopaedic Trauma

基　　金：广东省自然科学基金项目（10151051501000085）;AO创伤亚太研究基金

摘　　要：目的 通过对改良Galveston技术与拉力螺钉固定单侧骶髂关节脱位的三维有限元模型进行分析，比较其生物力学稳定性。方法 基于cT扫描数据，利用Mimicsl0．01软件和Geomagicl0．0软件对骨盆模型进行几何重建；利用Solidworks2007软件对内固定器械进行几何重建。导入Hyperme—shl0．0软件中进行网格划分和装配，赋予材料属性。建立右侧骶髂关节脱位双侧L4-髂骨Galveston固定、双侧L5-髂骨Galveston固定、单侧L4-髂骨Galveston固定、单侧L5-髂骨Galveston固定和拉力螺钉固定5种有限元模型。最后导人Ansysl0．0软件中，在L4椎体上方模拟施加500N轴向压缩载荷，分析不同内固定方式的vonMises应力分布和应变分布。结果 从应力和应变云图可知，双侧L4-髂骨Galveston固定、双侧L5-髂骨Galveston固定、单侧L4-髂骨Galveston固定、单侧L5-髂骨Galveston固定及拉力螺钉固定后骨盆的最大应力值分别为1．690X10^9Pa、1．310X10^9Pa、0．834X10^9Pa、0．836x10^9Pa、1．584X10^9Pa；骶骨相对于左侧髋骨的移位方向为向下、向前和向右，总位移依次为1．589X10^-3m、1．871X10^-3m、2．404X10^-3m、2．468X10^-3m、0．308×10^-3m。结论各种内固定下VonMises应力集中分布于腰髂螺钉与骨质的结合部位。改良Galveston技术双侧固定较单侧固定应变小，无论是双侧固定还是单侧固定，固定于L4和L6的应变无明显差异，但均明显大于拉力螺钉固定。Objective To explore biomechanical properties of modified Galveston technique and lag screw fixation for dislocation of the unilateral sacroiliac joint through finite element analysis. Methods Soft-ware Mimics 10.01 and Geomagic 10.0 was used to develop a geometric reconstruction of the pelvis based on the CT scan data. Geometric reconstructions of different internal fixations were also developed using software Solidworks 2007. The models were meshed, assembled and given the material properties through software Hypermesh 10.0. Five models of three-dimensional finite element （3D FE） were established for dislocation of the sacroiliac joint： double L4-ilium Galveston fixation, double L5-ilium Galveston fixation, single IA-ilium Galveston fixation, single L5-ilium Galveston fixation, and lag screw fixation. Finally the models were imported to software Ansys 10. 0. An axial load of 500 N was compressed above the L4 vertebral body. Stress-strain nephograms for the 5 different fixations were compared, and biomechanical stabilities of different internal fixations were analyzed. Results The stress-strain nephograms showed the maximum pelvic stresses in the 5 fixations were respectively 1. 690 x 10^9 Pa （double IA-I Galveston）, 1. 130x 10^9 Pa （double LS-I Galveston）, 0. 834 x 10^9 Pa （single IA-I Galveston）, 0. 836 x l0^9 Pa （single L5-I Galveston） and l. 584 x 10^9 Pa （lag screw fixation） . Displacements of the sacrum were downward, forward, and rightward. The total displacements were respectively 1. 589 x 10^-3 m, 1. 871 X 10^3 m, 2. 404 X 10^3 m, 2. 468 x lO^-3 m and 0. 308 x 10^3 m. Conclusions The maximum displacement in bilateral fixation is smaller than that in unilateral fixation with modified Galveston technique. In both bilateral and unilateral Galveston fixations for IA and LS, the maximum displacements are not significantly different, but they are larger than that in lag screw fixation.

关 键 词：骶髂关节 脱位 骨钉 骨折固定术 内 有限元分析 

分 类 号：R687.3[医药卫生—骨科学]