CAJ | 학술논문

目的通过对改良Galveston技术与拉力螺钉同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Mimics10.01软件和Geomagic10.0软件埘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.导人Hypermesh 10.0软件中进行刚格划分和装配,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同定、单侧L5-髂骨Galveston固定和拉力螺钉固定5种有限元模型.最后导入Ansys10.0软件中,在L4椎体上方模拟施加500 N轴向压缩载荷,分析不同内固定方式的von Mises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、舣侧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1.690×109 Pa、1.310×109 Pa、0.834×109 Pa、0.836×109 Pa、1.584×109 Pa;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1.589×10-3m、1.871×10～m、2.404×10-3 m、2.468×10-3m、0.308×10-3m.结论各种内固定下 Von Mises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L5的应变无明显差异,但均明显大于拉力螺钉吲定.
목적 통과대개량Galveston기술여랍력라정동정단측저가관절탈위적삼유유한원모형진행분석,비교기생물역학은정성.방법기우CT소묘수거,이용Mimics10.01연건화Geomagic10.0연건시골분모형진행궤하중건;이용Solidworks2007연건대내고정기계진행궤하중건.도인Hypermesh 10.0연건중진행강격화분화장배,부여재료속성.건립우측저가관절탈위쌍측L4-가골Galveston고정、쌍측L5-가골Galveston고정、단측L4-가골Galveston동정、단측L5-가골Galveston고정화랍력라정고정5충유한원모형.최후도입Ansys10.0연건중,재L4추체상방모의시가500 N축향압축재하,분석불동내고정방식적von Mises응력분포화응변분포.결과종응력화응변운도가지,쌍측L4-가골Galveston고정、의측L5-가골Galveston고정、단측L4-가골Galveston고정、단측L5-가골Galveston고정급랍력라정고정후골분적최대응력치분별위1.690×109 Pa、1.310×109 Pa、0.834×109 Pa、0.836×109 Pa、1.584×109 Pa;저골상대우좌측관골적이위방향위향하、향전화향우,총위이의차위1.589×10-3m、1.871×10～m、2.404×10-3 m、2.468×10-3m、0.308×10-3m.결론각충내고정하 Von Mises응력집중분포우요가라정여골질적결합부위.개량Galveston기술쌍측고정교단측고정응변소,무론시쌍측고정환시단측고정,고정우L4화L5적응변무명현차이,단균명현대우랍력라정신정.
Objective To explore biomechanical properties of modified Galveston technique and lag screw fixation for dislocation of the unilateral sacroiliac ioint through finite element analysis. Methods Soft-ware Mimics 10.0l 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 ioint:double L4-ilium Galveston fixation,double L5-ilium Galveston fixation,single L4-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 1.690×109Pa(double L4-1 Galveston),1.130×109Pa(double 1.584×109Pa(1ag screw fixation).Displacements of the sacrum were downward,forward,and rightward.The total displacements were respectively 1.589×10-3m,1.871×10-3m,2.404×10～m,2.468×10-3m and 0.308 ×103 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 L4and L5,the maximum displacements are not significantly different,but they are larger than that in lag screw fixation.