Techniques for Final Pelvic Ring Fixation Based on the Method of Finite Element Modeling

Abstract

Method of finite element modeling was used for mathematic modeling of pelvic fractures and various variants of anterior and posterior pelvic ring fixation with reconstructive plates, cannu- lated sacroiliac screws and pelvic screws. Four most common types of fracture were simulated. Stress-deformed conditions of metal constructions for every type of fracture and variant of its fixation were determined. Study results enabled to determine the optimum fixation techniques in various types of fractures, to confirm the significance of both anterior and posterior pelvic stabilization, as well as to substantiate the possibility of early rehabilitation with full weight bearing in such severe patients

Application of the Finite Element Method in Modeling Biological Systems in Traumatology and Orthopedics

“…In connection with the rapid development of computer technology and the increase in the power of electronic computers, the finite element method has found effective application for solving practical problems in various fields of human activity, primarily in structural mechanics, fluid mechanics and heat engineering [4]. Mathematical modeling of biomechanical processes (for example, the stress-strain state of dental implants, endoprostheses of large joints and metal fixators, taking into account the real physical properties of bone tissue [1]) is carried out using a software package, one of which is ANSYS [2]. For example, in the work of P. Ausiello [3], using the finite element method, an analysis of the dissipative ability of cement fixing dental ceramic implants in the bone was carried out, and in the work of F. Amirouche et al [2] analysis of the kinematics of the elements of the hip joint endoprosthesis depending on the stability of the installation of the acetabular component.…”

“…Based on literature data [2], the end elements of the cancellous bone were defined as tetrahedrons with an edge length of 2 mm, the cortical bone layer was defined as shell triangular end elements with a side of 2 mm (Fig. 1).…”

“…sacrospinous) and sacroiliac (lig. sacroiliac) ligaments, which have a significant impact on the stress-strain state of the pelvis, represented in the model by elastic springs with a constant tightening force of 10 N [2]. Between the sacrum and the iliac bones, as well as between the pubic bones, a friction coefficient of 0.6 was determined [2].…”

“…sacroiliac) ligaments, which have a significant impact on the stress-strain state of the pelvis, represented in the model by elastic springs with a constant tightening force of 10 N [2]. Between the sacrum and the iliac bones, as well as between the pubic bones, a friction coefficient of 0.6 was determined [2]. The choice of the number of design points and the shape of the finite elements was determined by the optimal ratio of sufficient accuracy of the result and the time required to calculate the system using the ANSYS software package.…”