Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu, 610041, China.
Int Orthop. 2013 Apr;37(4):653-8. doi: 10.1007/s00264-012-1756-6. Epub 2013 Jan 15.
The aim of this study was to investigate the biomechanics of the pelvis reconstructed with a modular hemipelvic prosthesis using finite element (FE) analysis.
A three-dimensional FE model of the postoperative pelvis was developed and input into the Abaqus FEA software version 6.7.1. Mesh refinement tests were then performed and a force of 500 N was applied at the lamina terminalis of the fifth lumbar vertebra along the longitudinal axis of the normal pelvis and the postoperative pelvis for three positions: sitting, standing on two feet, and standing on the foot of the affected side. Stress distribution analysis was performed between the normal pelvis and postoperative pelvis at these three static positions.
In the normal pelvis, stress distribution was concentrated on the superior area of the acetabulum, arcuate line, sacroiliac joint, sacral midline and, in particular, the superior area of the greater sciatic notch. In the affected postoperative hemipelvis, stress distribution was concentrated on the proximal area of the pubic plate, the top of the acetabular cup, the connection between the CS-fixator and acetabular cup and the fixation between the prosthesis and sacroiliac joint.
Stress distribution of the postoperative pelvis was similar to the normal pelvis at three different static positions. Reconstruction with a modular hemipelvic prosthesis yielded good biomechanical characteristics.
本研究旨在通过有限元（FE）分析研究使用模块化半骨盆假体重建骨盆的生物力学。
建立术后骨盆的三维 FE 模型，并将其输入到 Abaqus FEA 软件版本 6.7.1 中。然后进行网格细化测试，并在正常骨盆和术后骨盆的第五腰椎终板处沿正常骨盆和术后骨盆的纵轴施加 500 N 的力，分别在三个位置（坐、双脚站立和患侧站立）。在这三个静态位置分析正常骨盆和术后骨盆之间的应力分布。
在正常骨盆中，应力分布集中在髋臼的上区域、弧形线、骶髂关节、骶骨中线，特别是坐骨大切迹的上区域。在受影响的术后半骨盆中，应力分布集中在耻骨板的近端区域、髋臼杯的顶部、CS 固定器和髋臼杯之间的连接以及假体和骶髂关节之间的固定。
术后骨盆在三个不同的静态位置的应力分布与正常骨盆相似。使用模块化半骨盆假体重建具有良好的生物力学特性。
