Biomechanical computer modeling of “bone-fixator-endoprosthesis” system functioning after different types of internal hemipelvectomy

I.A. Lazarev, V.Yu. Kostiuk, A.G. Diedkov, M.V. Skiban


Reconstructive surgical intervention after removing pelvic bone tumor remains a complex issue for modern orthopedic oncology. In order to substantiate the functioning of biomechanical system “bone-fixator-endoprosthesis” under load in different types of internal hemipelvectomy, a finite element analysis of stress-strain state was performed in four major variants of pelvic bone resection in patients with pelvic bone tumors. Based on axial scans of spiral computed tomography of the pelvis with proximal femur and hip endoprosthesis, using the Mimics software package, there was created the pelvis spatial geometry and 3D simulation models of different internal hemipelvectomy types by Enneking with defect reconstruction by spacer. Subsequent calculations were carried out using finite element method with calculation of stress-strain state by ANSYS package. The key indicators for the comparative analysis were selected data obtained by calculating the value of stress (by von Mises) and total deformations of the model. Biomechanical studies demonstrate the maximum reliability of hemipelvectomy type II. In all investigated models, the maximum stress is located under the head of screws and do not exceed the limits of strength, and minimal stress is located on distal parts of screws, so the length of the screws will not significantly affect the stability of construction. In all investigated models, the maximum stress on the beam was established in the places of contact with screws and minimal — in the middle part of the spacer, so the installation of the beam to join screw heads requires further investigation and correction of the reconstruction technique. The risk of instability or destruction of construction increases as a result of cyclic loads that is followed by an increase in stress-strain state and could be the basis for more accurate selection of optimal tactics of reconstructive surgery after tumor removal.


опухоль тазовой кости; гемипельвэктомия; напряженно-деформированное состояние


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