Yong Zhou, Li Min, Yang Liu, Rui Shi, Wenli Zhang, Hui Zhang, Hong Duan and Chongqi Tu
Accepted Abstracts: Rheumatology & Orthopedics
Objectives: The aim of this study was to investigate the biomechanics of the pelvis reconstructed by modular hemipelvic prosthesis using finite element (FE) method. Methods: A three-dimensional FE model of the postoperative pelvis was developed and inputted into the Abaqus 6.7.1. Then mesh refinement tests were performed and a force of 500 N was applied at fifth lumbar vertebra lamina terminalis along the pelvic longitudinal axis respectively to the normal pelvis and the postoperative pelvis in three positions: sitting, standing on two feet and standing on foot of affected side. Stress distribution analysis was performed between normal pelvis and postoperative pelvis at these three static positions. Results: In the normal pelvis, stress distribution is concentrated upon the superior of the acetabulum, arcuate line, sacroiliac joint, upside of the sacrum mesion and especially superior of greater sciatic notch. In the affected side pelvis, stress distribution is concentrated upon the proximal of pubic plate, upside of acetabular cup, connection between CS-fixator and acetabular cup and the fixation between prosthesis and sacroiliac joint. Conclusions: Stress distribution of the postoperative pelvis was similar to the normal pelvis at different static positions. Reconstructed with modular hemipelvic prosthesis obtained good biomechanical characteristics.
