Download or read book Quantitative Response Analysis of Human Femur with Prosthesis to Stress Using 3 D Finite Element Method written by Young Il Park and published by . This book was released on 1988 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Holographic Deformation Analysis of the Human Femur written by and published by . This book was released on 2001 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The deformations of the neck and head of the human dried femur were measured and analyzed with loads applied at the femoral head. Particular attention was paid to measurements of bones with osteoporosis. We used double exposures or real-time holographic interferometry to measure precisely. The distal part of each femur was embedded in super hard plaster, and the load was applied at the femoral head. In order to better simulate the situation of a femur under physiological muscles, we used the 3D finite element method (FEM) for our analyses. After modeling the femur, which consisted of meshing as eight noded elements for each section of diaphysis, we used the 3D FEM to calculate stress and strain. We obtained the following results : (1)the deformations increased with the progress of osteoporosis;(2) femur with osteoporosis showed obvious rotational components in the femoral shaft and (3) a compressive stress distribution could be found at the medial side of the diaphyseal region by using the FEM.
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of an Adaptive 3 D Model of the Human Femur to Simulate Bone Remodeling Following Hip Resurfacing and Total Hip Arthroplasties written by Christopher Robert Deuel and published by . This book was released on 2007 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Finite Element Analysis of a Femur to Deconstruct the Design Paradox of Bone Curvature written by Sameer Jade and published by . This book was released on 2012 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: The femur is the longest limb bone found in humans. Almost all the long limb bones found in terrestrial mammals, including the femur studied herein, have been observed to be loaded in bending and are curved longitudinally. The curvature in these long bones increases the bending stress developed in the bone, potentially reducing the bone's load carrying capacity, i.e. its mechanical strength. Therefore, bone curvature poses a paradox in terms of the mechanical function of long limb bones. The aim of this study is to investigate and explain the role of longitudinal bone curvature in the design of long bones. In particular, it has been hypothesized that curvature of long bones results in a trade-off between the bone's mechanical strength and its bending predictability. This thesis employs finite element analysis of human femora to address this issue. Simplified human femora with different curvatures were modeled and analyzed using ANSYS Workbench finite element analysis software. The results obtained are compared between different curvatures including a straight bone. We examined how the bone curvature affects the bending predictability and load carrying capacity of bones. Results were post processed to yield probability density functions (PDFs) for circumferential location of maximum equivalent stress for various bone curvatures to assess the bending predictability of bones. To validate our findings on the geometrically simplified ANSYS Workbench femur models, a digitally reconstructed femur model from a CT scan of a real human femur was employed. For this model we performed finite element analysis in the FEA tool, Strand7, executing multiple simulations for different load cases. The results from the CT scanned femur model and those from the CAD femur model were then compared. We found general agreement in trends but some quantitative differences most likely due to the geometric differences between the digitally reconstructed femur model and the simplified CAD models. As postulated by others, our results support the hypothesis that the bone curvature is a trade-off between the bone strength and its bending predictability. Bone curvature increases bending predictability at the expense of load carrying capacity.
Download or read book Finite Element Method and Medical Imaging Techniques in Bone Biomechanics written by Rabeb Ben Kahla and published by John Wiley & Sons. This book was released on 2020-01-02 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Digital models based on data from medical images have recently become widespread in the field of biomechanics. This book summarizes medical imaging techniques and processing procedures, both of which are necessary for creating bone models with finite element methods. Chapter 1 introduces the main principles and the application of the most commonly used medical imaging techniques. Chapter 2 describes the major methods and steps of medical image analysis and processing. Chapter 3 presents a brief review of recent studies on reconstructed finite element bone models, based on medical images. Finally, Chapter 4 reveals the digital results obtained for the main bone sites that have been targeted by finite element modeling in recent years.
Download or read book 3D Modeling and Finite Element Analysis of Femur After Removing Surgical Screws written by Kyle D. Newman and published by . This book was released on 2016 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Often bone fractures are joined by inserting metal plates and screws to hold the fragmented bone under compression. However, after the fractured bone is healed removing the screws leaves holes in the bone which takes months to fill up and heal completely. The goal of this research is to investigate those voids specifically in a finite element model of a femur. The holes were found to experience high stress that can easily lead to crack propagations during everyday activities. Finite element models of femurs were modeled after two common fracture fixation systems, specifically just after the plates, rods and screws are removed. To observe the stress levels bones are likely to experience, common mechanical tests that are relevant to or associated with common daily activities were performed. While the 3-point bending tests did not yield significant results, the compression and torsion tests produced high stress areas near the screw holes. In certain cases, the von Mises' stress reached 3.66 x 106 N/mm2. Our finite element modeling seeks to establish groundwork for future explorations on the holes created by fracture fixation hardware. In the future, this work will lead to redesigning of fixation systems with reduced stress concentration around the holes. Therefore, the initiation of new cracks around these holes will be limited during everyday activity.
Download or read book Elastic Properties of the Human Femur written by Annette Bretin and published by . This book was released on 2019-02-04 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Patient-specific finite element modelling of bone is a promising method for surgical planning, implant design and the prediction of bone remodelling or fracture risks, yet the assignment of material properties is challenging. Bone is a complicated structure with direction-dependent, inhomogeneous material properties, influenced by compositional, geometrical and architectural aspects. This volume focuses on a density-based assignment of orthotropic bone properties. Elasticity-density relationships in homogenized femoral zones were examined to evaluate the orthotropic density-dependence of the nine elastic material constants locally. Cortical bone samples were tested in compression and torsion tests using videoextensometry to determine the elastic constants. The elastic properties of cancellous bone were predicted by micro finite element analysis. All determined constants were correlated to the radiological bone mineral density of each sample, which was determined by quantitative computed tomography. The trabecular eigensystem was investigated for each cancellous zone to assign the mean directionality of trabecular fabric. The results can be beneficial for density-based orthotropic material assignment in femoral patient-specific finite element models.
Download or read book Journal of Rehabilitation Research Development written by and published by . This book was released on 2001 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Finite Element Analysis of the Human Femur a Validation Study written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Rehabilitation R D written by and published by . This book was released on 1999 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1988 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Finite Element Analysis of a Three dimensional Model of the Proximal Femur Containing a Cemented Prosthesis written by Rajesh V. Duggineni and published by . This book was released on 2005 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Rehabilitation Research and Development written by and published by . This book was released on 1999 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanical Stress Functional Adaptation and the Variation Structure of the Human Femur Diaphysis written by E. Amtmann and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: According to the classical theory of functional structure of bone which was developed by J. Wolff (1884, 1892) and W. Roux (1895) following the investigations of the functional architecture of the substantia spongiosa by H. von Meyer (1867), bone is "functionally" laid down in gross form as well as in minute architecture in accordance with the "maximum-minimum-law". As a result of functional adaptation, a maximum of efficiency is achieved with a minimum of material (Kummer, 1962a). In this sense functional adaptation is a reaction of adaptation of the idiotype-within the bounds of the reaction norm-to a changed internal environment, that is in this case an adaptation to changed mechanical stresses. 1. The Formation of the Normal Femur Shape The heredity basis of shape characteristics of human femora is really unknown. Identical twins show a significant lower variability of length of femur than binovular twins. Population variability of length of femur due to heritability may exceed twice the variability due to environmental factors (Knussmann, 1968). A significant part of the total variation of femur shape characteristics remains therefore unexplained supposing that the sources of variation due to heritability and environmental factors are also nearly the same for the other traits.
Download or read book Engineering Analysis with ANSYS Software written by Tadeusz Stolarski and published by Butterworth-Heinemann. This book was released on 2018-01-02 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering Analysis with ANSYS Software, Second Edition, provides a comprehensive introduction to fundamental areas of engineering analysis needed for research or commercial engineering projects. The book introduces the principles of the finite element method, presents an overview of ANSYS technologies, then covers key application areas in detail. This new edition updates the latest version of ANSYS, describes how to use FLUENT for CFD FEA, and includes more worked examples. With detailed step-by-step explanations and sample problems, this book develops the reader's understanding of FEA and their ability to use ANSYS software tools to solve a range of analysis problems. - Uses detailed and clear step-by-step instructions, worked examples and screen-by-screen illustrative problems to reinforce learning - Updates the latest version of ANSYS, using FLUENT instead of FLOWTRAN - Includes instructions for use of WORKBENCH - Features additional worked examples to show engineering analysis in a broader range of practical engineering applications
Download or read book Analysis of Surface Cracks at Hole by a 3 D Weight Function Method with Stresses from Finite Element Method written by and published by . This book was released on 1995 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
