Stress-Strain State of the Proximal Femur with Cavity Defect (Focus of Fibrous Dysplasia) in Osteosynthesis with Different Types of Fixation Devices

I.A. Lazarev, Yu.M. Huk, Yu.V. Oliinyk, M.V. Skyban

Abstract


The development of abnormal fibrous tissue in certain areas of the femur with fibrous dysplasia leads to the changes in its biomechanical properties and is the cause of pathological fractures and deformities. Finite element analysis of stress-strain state of the biomechanical system «femur — fixation device» with the presence of cavity defect in the proximal femur (simulation model of focal fibrous dysplasia) has been carried out in order to prove the effectiveness of osteosynthesis with different types of fixation devices in this pathology. Based on computed tomography scans of Sawbones biomechanical model of the femur, using Mimics and SolidWorks software packages, there were created simulation computer 3D-models of the intact femur, femoral bone with cavity defect and various types of fixation devices: LCP (locking compression plate), ABP (angled blade plate) for proximal femur and FN (femoral interlocking nail). Analysis of stress-strain state in the ANSYS environment has been carried out on the main elements of the femur and fixation devices in terms of stress (σ) by von Mises and deformities (ε). The presence of the cavity defect in the proximal femur determines the growth in the parameters of stress and strain by 67.8 % at the superior surface of the neck and by 34.2 % at the inferior surface of the neck as compared to the intact femur, indicating a significant risk of pathological fracture. When using different techniques of osteosynthesis, there were identified objectively undeniable advantages of plates for proximal femur (LCP) and femoral locking nail (FN) over the angled plate (ABP).


Keywords


stress-strain state; fibrous dysplasia; pathological fracture; osteosynthesis

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DOI: https://doi.org/10.22141/1608-1706.3.16.2015.80234

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