摘要
建立正常左侧半骨盆三维有限元模型,模拟4个典型的截骨平面。根据不同的截骨位置利用Solidworks 2006软件进行相应尺寸的半骨盆假体绘制。组装后分别模拟4个截骨平面假体重建三维有限元模型。计算4个截骨水平下半骨盆假体系统在单腿负重期应力峰值、最大位移、应力集中部位的应力值,以及4枚横向固定螺钉的应力峰值。4个截骨位置在髋臼上方缺损长度分别为20-56cm不等,随截骨位置升高,截骨平面与水平成角增加,内固定系统的稳定性逐渐下降,最大位移增加,系统最大应力值逐渐增高。并且在水平截骨及与水平成角截骨情况下4枚横行固定螺钉应力分布特点不同。结果提示,随髋臼上方骨缺损范围增加,截骨位置与水平面成角逐渐加大,假体系统固定效果下降。对于截骨平面与水平面平行的骨缺损半骨盆假体可以获得较好的稳定性。
Four typical resection levels were simulated based on the normal left hemipelvic three-dimensional finite element model. According to bone defect of each resection level, four prostheses were established by computer aided design software Solidworks2006 to reconstruct the periacetabulum. Four defect pelvic models with different resection levels reconstructed with modular hemipelvic prosthesis were established. Systemic peak stress, peak displacement, and stress concentration on the prosthesis at single leg stand phase during the gait cycle were calculated to evaluate the fixation stability. Also the stress distribution characteristics of four transverse screws were analyzed. The defect distance between the acetabulum and resection levels was ranging from 20 to 56 cm. With resection level went up and increase of angle between the resection level and horizontal level, the systemic peak stress and the peak displacement increased while the stability of reconstruction system decreased. The characteristic of the stress distribution on four transverse screws were significantly different between the resection level parallel to the horizontal and angled situation. With the enlargement of periacetabular defect and increase of angle between resection level and horizontal, the stability of hemipelvic prosthesis decreased. Reliable reconstruction by modular hemipelvic prosthesis could be achieved when the iliac resection level parallel to the horizontal.
出处
《中国组织工程研究与临床康复》
CAS
CSCD
北大核心
2009年第35期6841-6844,共4页
Journal of Clinical Rehabilitative Tissue Engineering Research
