CAJ | 학술논문

目的建立脊柱胸腰段骨质疏松性椎体压缩骨折及邻近节段的有限元模型,并对模型进行初步的生物力学分析.方法利用交互式医学图像控制系统MIMICS软件对患者的CT图片进行预处理,后导入大型通用有限元软件ABAQUS中建立三维有限元模型.建立了胸10-腰2四个运动单元的三维模型,并且准确模拟了椎间盘、软骨终板、关节突关节以及连接韧带.通过设置0.3、1.0、4.0 Mpa 3种轴向载荷进行力学分析,观察力学改变情况.结果当轴向压力以0.3、1.0、4.0MPa增加后,椎间盘、软骨终板和椎体整体的应力也成比例增加.椎间盘所受应力分布不均;各椎体前部所受应力最大,而后部结构所受应力较小,椎体局部出现受力较大情况,尤以相邻椎体更为明显.结论本研究的有限元模型符合胸腰段骨质疏松性椎体骨折的临床特点,模拟了其生物力学特性.
목적 건립척주흉요단골질소송성추체압축골절급린근절단적유한원모형,병대모형진행초보적생물역학분석.방법 이용교호식의학도상공제계통MIMICS연건대환자적CT도편진행예처리,후도입대형통용유한원연건ABAQUS중건립삼유유한원모형.건립료흉10-요2사개운동단원적삼유모형,병차준학모의료추간반、연골종판、관절돌관절이급련접인대.통과설치0.3、1.0、4.0 Mpa 3충축향재하진행역학분석,관찰역학개변정황.결과 당축향압력이0.3、1.0、4.0MPa증가후,추간반、연골종판화추체정체적응력야성비례증가.추간반소수응력분포불균;각추체전부소수응력최대,이후부결구소수응력교소,추체국부출현수력교대정황,우이상린추체경위명현.결론 본연구적유한원모형부합흉요단골질소송성추체골절적림상특점,모의료기생물역학특성.
Objective To build a three-dimensional finite element model of thoracolumbar spine with osteoporotic vertebral compression fracture(OVCF)and analyze its biomechanical change. Methods The T10-L2 segment data were obtained from computed tomography(CT)scans of an elderly female with a single T12 OVCF. A three-dimensional finite element model of thoracolumbar spine was constructed with the MIMICS and ABAQUS software. The model was composed of bony vertebrae, articulating facets,intervertebral disc and associated ligaments. The basic stress analysis of T10-L2 motion segment was made for different material properties of bone, ligaments and facet joints contacting frictional property. The stress on the annulus fiber, nucleus pulposus, endplate and facet joints under axial pressure(0. 3 MPa, 1.0 MPa,4. 0 MPa)were analyzed. Results A three-dimensional finite element model of human T12-L2 motion segment had 617468 elements. And the stress was higher in vertebral body than posterior structure. The distribution of pressure stresses in intervertebral disc was asymmetrical. The stress increased with a rising axial pressure. Conclusion 3D finite element model of thoracolumbar OVCF and adjacent segments are successfully established. The results of stress analysis are both feasible and reliable.