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Volume 6, Number 1, 2022

This study contains a comparative analysis of two polymers: PEEK and UHMWPE. A stress distribution pattern in a knee joint endoprosthesis insert was determined for both materials. A numerical model of the insert generated by means of the SOLIDWORKS software was used in calculations. For the purpose of the calculations it was assumed that the insert is loaded consistently and symmetrically, and the value of the load applied was determined for a person of a total weight of 120 kg.

Key Words
endoprosthesis; finite elements methods; polyetheretherketone; implant devices

Wiktoria M. Wojnarowska: Doctoral School of Engineering and Technical Sciences at the Rzeszow University of Technology, Poland
Slawomir Miechowicz: Department of Mechanical Engineering, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Poland
Tomasz Kudasik: Department of Mechanical Engineering, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Poland

This work throws light on the reflection and transmission phenomenon due to incident plane longitudinal wave at a plane interface between inviscid fluid half-space and a non local bio-thermoelastic diffusive half-space. The governing equations are formulated by adopting non local heat conduction and mass diffusion along with dual phase lag (DPL) model. The amplitude ratios are obtained analytically and these amplitude ratios are used to drive energy ratios. The distribution of energy of incident wave among reflected and transmitted waves are obtained. The obtained ratios are impacted by angle of incidence, frequency and different properties of media involved. Numerically examined energy ratios are displayed in the form of graphs to know the effect of non local parameters, lagging times, stiffness and blood perfusion rate.

Key Words
amplitude ratios; bio-thermoelasticity; diffusion; fluid; non local; reflection; transmission

Rajneesh Kumar: Department of Mathematics, Kurukshetra University, Kurukshetra, 136119 Haryana, India
Suniti Ghangas: Department of Mathematics, M.D.S.D. Girls College, Ambala City, 134003, Haryana, India
Anil K. Vashishth: Department of Mathematics, Kurukshetra University, Kurukshetra, 136119 Haryana, India

Femoral stems with proximal metaphyseal involvement are commonly used total hip replacement components with very good results. In this study, total hip arthroplasty (THA) application was analyzed using a three-dimensionally modeled human hip joint by finite element method. The aim of the study is to investigate the effects of changes in the direction of the femoral stem on these complications. Finite element analysis is performed on a model of femur bone by varying the femur angles. Finite element models were prepared for three different positions (5 degrees varus, neutral, 5 degrees valgus) on the femur without cement during walking motions. A sinusoid dynamic load with amplitude between 300 N and 1700 N and with a frequency of 1 Hz was applied. The stresses, strains and deformations that occurred on the femur and stems were determined at the end of the finite element analysis and compared to each other. Considering the results of strain, strain and deformation in the study, it is seen that the closest results to the natural load bearing of the femur are in the valgus position. The results obtained in the neutral position are also close to these results. In the metaphyseal points involving the femur stem, the highest values were found in the varus position. In all three positions, the femoral stem provides the transfer of the load from the proximal femur. The lowest stress, strain and deformation results were obtained in the valgus position, especially in the metaphyseal where the prosthesis is involved. It is seen that there are values close to this in the neutral position. This situation may be thought to result in a decrease in the proximal stress shield, an increase in bone protection compared to the varus position, a long-term loosening and a decrease in periprosthetic fracture.

Key Words
biomechanics; finite element method; total hip arthroplasty

Yilmaz Guvercin: Department of Orthopaed and Traumatol, Recep Tayyip Erdogan University, 53100, Rize, Turkey
Murat Yaylaci: Department of Civil Engineering, Recep Tayyip Erdogan University, 53100, Rize, Turkey
Hasan Ölmez: Department of Marine Engineering Operations, Karadeniz Technical University, 61530, Trabzon, Turkey
Ecren Uzun Yaylaci: Surmene Faculty of Marine Science, Karadeniz Technical University, 61530, Trabzon, Turkey
Mehmet Emin ozdemir: Department of Civil Engineering, Cankiri Karatekin University, 18100, cankiri, Turkey
Ayberk Dizdar: Department of Biomedical Engineering, Kocaeli University, 41380, Kocaeli, Turkey

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