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Finite element analysis

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https://www.readbyqxmd.com/read/28730248/clavicle-anatomical-osteosynthesis-plate-breakage-failure-analysis-report-based-on-patient-morphological-parameters
#1
Rodica Marinescu, Vasile Iulian Antoniac, Dan Ioan Stoia, Dan Constantin Lăptoiu
Clavicle fracture reported incidence is about 5% of fractures in adult; among them, those located in the middle third of the shaft represent more than 80% from the total of cases. Due to the special morphological and biomechanical constraints of the clavicle, several methods for restoring morphological integrity in these fractures are described, including conservative, non-surgical treatment. The last 10 years of clinical studies in the field have favored the surgical treatment for selected cases; several osteosynthesis implants are in use - mostly anatomical plates with specific advantages and documented complications...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28729605/evaluating-the-effects-of-material-properties-of-artificial-meniscal-implant-in-the-human-knee-joint-using-finite-element-analysis
#2
Duraisamy Shriram, Gideon Praveen Kumar, Fangsen Cui, Yee Han Dave Lee, Karupppasamy Subburaj
Artificial meniscal implants may replace severely injured meniscus and restore the normal functionality of the knee joint. Implant material stiffness and shape influence the longevity of implantations. This study, using 3D finite element analysis, aimed to evaluate the effects of material stiffness variations of anatomically shaped artificial meniscal implant in the knee joint. Finite element simulations were conducted on five different cases including intact knee, medial meniscectomized knee, and the knee joint with the meniscal implant with three distinct material stiffness...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728867/finite-element-analysis-of-tavi-impact-of-native-aortic-root-computational-modeling-strategies-on-simulation-outcomes
#3
Alice Finotello, Simone Morganti, Ferdinando Auricchio
In the last few years, several studies, each with different aim and modeling detail, have been proposed to investigate transcatheter aortic valve implantation (TAVI) with finite elements. The present work focuses on the patient-specific finite element modeling of the aortic valve complex. In particular, we aim at investigating how different modeling strategies in terms of material models/properties and discretization procedures can impact analysis results. Four different choices both for the mesh size (from  20 k elements to  200 k elements) and for the material model (from rigid to hyperelastic anisotropic) are considered...
July 17, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28728078/femoral-head-necrosis-a-finite-element-analysis-of-common-and-novel-surgical-techniques
#4
Myriam Cilla, Sara Checa, Bernd Preininger, Tobias Winkler, Carsten Perka, Georg N Duda, Matthias Pumberger
BACKGROUND: Femoral head necrosis is a common cause of secondary osteoarthritis. At the early stages, treatment strategies are normally based on core decompression techniques, where the number, location and diameter of the drilling holes varies depending on the selected approach. The purpose of this study was to investigate the risk of femoral head, neck and subtrochanteric fracture following six different core decompression techniques. MATERIALS: Five common and a newly proposed techniques were analyzed in respect to their biomechanical consequences using finite element analysis...
July 6, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28726191/virtual-experimental-validation-of-dynamic-osteosynthesis-in-the-treatment-of-fractures-of-the-proximal-femur
#5
V E Dubrov, I A Kuz'kin, I M Shcherbakov, A L Matveev, A V Yudin
Volume model of transtrochanteric fracture of the femoral bone fixed by Targon PF dynamic fixator was studied by the finite element analysis. The following parameters were measured: magnitude and direction of displacement of system elements, pressure between fragments, and von Mises stress distribution in the fixator depending on support screw plunging into the sleeve. The results indicate that stability of the bone-nail system increases during fracture union and 10-mm shortening of the femoral neck axis, which is seen from a decrease in system deformation under load by 16...
July 18, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28724628/stiffness-distribution-in-insect-cuticle-a-continuous-or-a-discontinuous-profile
#6
H Rajabi, M Jafarpour, A Darvizeh, J-H Dirks, S N Gorb
Insect cuticle is a biological composite with a high degree of complexity in terms of both architecture and material composition. Given the complex morphology of many insect body parts, finite-element (FE) models play an important role in the analysis and interpretation of biomechanical measurements, taken by either macroscopic or nanoscopic techniques. Many previous studies show that the interpretation of nanoindentation measurements of this layered composite material is very challenging. To develop accurate FE models, it is of particular interest to understand more about the variations in the stiffness through the thickness of the cuticle...
July 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28722129/bone-strength-estimated-by-micro-finite-element-analysis-%C3%A2%C2%B5fea-is-heritable-and-shares-genetic-predisposition-with-areal-bmd-the-framingham-study
#7
David Karasik, Serkalem Demissie, Darlene Lu, Kerry E Broe, Steven K Boyd, Ching-Ti Liu, Yi-Hsiang Hsu, Mary L Bouxsein, Douglas P Kiel
Genetic factors contribute to the risk of bone fractures, partly because of effects on bone strength. High-resolution peripheral quantitative computed tomography (HR-pQCT) estimates bone strength using micro-finite element analysis (µFEA). The goal of this study was to investigate if the bone failure load estimated by HR-pQCT-based µFEA is heritable and to what extent it shares genetic regulation with areal bone mineral density (aBMD). Bone microarchitecture was measured by HR-pQCT at the ultradistal tibia and ultradistal radius in adults from the Framingham Heart Study (n = 1087, mean age 72 years; 57% women)...
July 19, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28721473/biomechanics-of-the-classic-metaphyseal-lesion-finite-element-analysis
#8
Andy Tsai, Brittany Coats, Paul K Kleinman
BACKGROUND: The classic metaphyseal lesion (CML) is strongly associated with infant abuse, but the biomechanics responsible for this injury have not been rigorously studied. Radiologic and CT-pathological correlates show that the distal tibial CML always involves the cortex near the subperiosteal bone collar, with variable extension of the fracture into the medullary cavity. Therefore, it is reasonable to assume that the primary site of bone failure is cortical, rather than intramedullary...
July 18, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28720340/mechanical-strength-and-fracture-point-of-a-dental-implant-under-certification-conditions-a-numerical-approach-by-finite-element-analysis
#9
Guillermo de la Rosa Castolo, Sonia V Guevara Perez, Pierre-Jean Arnoux, Laurent Badih, Franck Bonnet, Michel Behr
STATEMENT OF PROBLEM: Implant prosthodontics provides high-quality outcomes thanks to recent technological developments and certification procedures such as International Organization for Standardization (ISO) standard 14801. However, these certification tests are costly, and the result is highly uncertain as the influence of design variables (materials and structure) is still unknown. The design process could be significantly improved if the influence of design parameters were identified...
July 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28718314/techniques-of-force-and-pressure-measurement-in-the-small-joints-of-the-wrist
#10
Michael J Schreck, Meghan Kelly, Colin D Canham, John C Elfar
BACKGROUND: The alteration of forces across joints can result in instability and subsequent disability. Previous methods of force measurements such as pressure-sensitive films, load cells, and pressure-sensing transducers have been utilized to estimate biomechanical forces across joints and more recent studies have utilized a nondestructive method that allows for assessment of joint forces under ligamentous restraints. METHODS: A comprehensive review of the literature was performed to explore the numerous biomechanical methods utilized to estimate intra-articular forces...
February 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28716401/research-on-the-parallel-load-sharing-principle-of-a-novel-self-decoupled-piezoelectric-six-dimensional-force-sensor
#11
Ying-Jun Li, Cong Yang, Gui-Cong Wang, Hui Zhang, Huan-Yong Cui, Yong-Liang Zhang
This paper presents a novel integrated piezoelectric six-dimensional force sensor which can realize dynamic measurement of multi-dimensional space load. Firstly, the composition of the sensor, the spatial layout of force-sensitive components, and measurement principle are analyzed and designed. There is no interference of piezoelectric six-dimensional force sensor in theoretical analysis. Based on the principle of actual work and deformation compatibility coherence, this paper deduces the parallel load sharing principle of the piezoelectric six-dimensional force sensor...
July 14, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28715168/junction-less-diode-enabled-by-self-bias-effect-of-ion-gel-in-single-layer-mos2-device
#12
Muhammad Atif Khan, Servin Rathi, Jinwoo Park, Dongsuk Lim, Yoontae Lee, Sun Jin Yun, Doo Hyeb Youn, Gil-Ho Kim
The self-biasing effects of ion gel from source and drain electrodes on electrical characteristics of single layer and few layer molybdenum disulfide (MoS2) field effect transistor (FET) have been studied. The self-biasing effect of ion gel is tested for two different configurations, covered and open, where ion gel is in contact with either one or both, source and drain electrodes, respectively. In open configuration, the linear output characteristics of the pristine device becomes non-linear and on-off ratio drops by three order of magnitude due to the increase in 'off' current for both single and few layer MoS2 FETs...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28713177/nitsche-s-method-for-helmholtz-problems-with-embedded-interfaces
#13
Zilong Zou, Wilkins Aquino, Isaac Harari
In this work, we use Nitsche's formulation to weakly enforce kinematic constraints at an embedded interface in Helmholtz problems. Allowing embedded interfaces in a mesh provides significant ease for discretization, especially when material interfaces have complex geometries. We provide analytical results that establish the well-posedness of Helmholtz variational problems and convergence of the corresponding finite element discretizations when Nitsche's method is used to enforce kinematic constraints. As in the analysis of conventional Helmholtz problems, we show that the inf-sup constant remains positive provided that the Nitsche's stabilization parameter is judiciously chosen...
May 18, 2017: International Journal for Numerical Methods in Engineering
https://www.readbyqxmd.com/read/28713050/the-biomechanical-impact-of-the-facet-tropism-on-the-intervertebral-disc-and-facet-joints-in-the-cervical-spine
#14
Xin Rong, Beiyu Wang, Chen Ding, Yuxiao Deng, Hua Chen, Yang Meng, Weijie Yan, Hao Liu
BACKGROUND CONTEXT: The facet tropism is defined as the angular difference between the left and right facet orientation. The facet tropism was suggested to be associated with the disc degeneration and facet degeneration in the lumbar spine. However, little is known about the relationship between the facet tropism and pathological changes in the cervical spine and the mechanism behind. PURPOSE: This study was conducted to investigate the biomechanical impact of the facet tropism on the intervertebral disc and facet joints...
July 13, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28712877/bone-mass-microarchitecture-and-strength-are-influenced-by-race-ethnicity-in-young-adult-men-and-women
#15
Kristin L Popp, Julie M Hughes, Adriana Martinez-Betancourt, Matthew Scott, Victoria Turkington, Signe Caksa, Katelyn I Guerriere, Kathryn E Ackerman, Chun Xu, Ginu Unnikrishnan, Jaques Reifman, Mary L Bouxsein
Lower rates of fracture in both Blacks compared to Whites, and men compared to women are not completely explained by differences in bone mineral density (BMD). Prior evidence suggests that more favorable cortical bone microarchitecture may contribute to reduced fracture rates in older Black compared to White women, however it is not known whether these differences are established in young adulthood or develop during aging. Moreover, prior studies using high-resolution pQCT (HR-pQCT) have reported outcomes from a fixed-scan location, which may confound sex- and race/ethnicity-related differences in bone structure...
July 13, 2017: Bone
https://www.readbyqxmd.com/read/28710359/computationally-informed-design-of-a-multi-axial-actuated-microfluidic-chip-device
#16
Alessio Gizzi, Sara Maria Giannitelli, Marcella Trombetta, Christian Cherubini, Simonetta Filippi, Adele De Ninno, Luca Businaro, Annamaria Gerardino, Alberto Rainer
This paper describes the computationally informed design and experimental validation of a microfluidic chip device with multi-axial stretching capabilities. The device, based on PDMS soft-lithography, consisted of a thin porous membrane, mounted between two fluidic compartments, and tensioned via a set of vacuum-driven actuators. A finite element analysis solver implementing a set of different nonlinear elastic and hyperelastic material models was used to drive the design and optimization of chip geometry and to investigate the resulting deformation patterns under multi-axial loading...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28709754/nondestructive-mechanical-characterization-of-developing-biological-tissues-using-inflation-testing
#17
P J A Oomen, M A J van Kelle, C W J Oomens, C V C Bouten, S Loerakker
One of the hallmarks of biological soft tissues is their capacity to grow and remodel in response to changes in their environment. Although it is well-accepted that these processes occur at least partly to maintain a mechanical homeostasis, it remains unclear which mechanical constituent(s) determine(s) mechanical homeostasis. In the current study a nondestructive mechanical test and a two-step inverse analysis method were developed and validated to nondestructively estimate the mechanical properties of biological tissue during tissue culture...
July 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28709037/finite-element-analysis-and-clinical-complications-in-mandibular-implant-overdentures-opposing-maxillary-dentures
#18
Tameem Khuder, Norsiah Yunus, Eshamsul Sulaiman, Ali Dabbagh
Denture fracture is a common clinical complication caused by improper material selection, design, or fabrication technique. This study aimed to investigate the effect of two attachment systems on fracture risk of the implant-overdentures (IOD) via finite element analysis (FEA), using the force distributions obtained from patients' occlusal analyses and to compare the obtained results with the clinical complications associated with these attachments. A three-dimensional jaw model comprised of the edentulous bones was constructed...
July 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28708912/finite-element-analysis-of-bone-stress-in-the-posterior-mandible-using-regular-and-short-implants-in-the-same-context-with-splinted-and-nonsplinted-prostheses
#19
Marcelo Bighetti Toniollo, Ana Paula Macedo, Denise Pupim, Danilo Zaparolli, Maria da Gloria Chiarello de Mattos
PURPOSE: The aim of this study was to compare the bone stress generated by rehabilitation using regular and short-length Morse taper implants (11 and 5 mm, respectively) in the same context and allied with splinted (SP) and nonsplinted (NSP) prostheses in the posterior area of the mandible using finite element analysis. MATERIALS AND METHODS: Three-dimensional geometric models using regular implants (Ø4 × 11 mm) and short implants (Ø4 × 5 mm) were simulated with a left posterior mandible that had the first premolar tooth and all teeth posterior to that premolar removed...
July 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28708909/biomechanical-three-dimensional-finite-element-analysis-of-single-implant-supported-prostheses-in-the-anterior-maxilla-with-different-surgical-techniques-and-implant-types
#20
Fellippo Ramos Verri, Joel Ferreira Santiago, Daniel Augusto Almeida, Victor Eduardo de Souza Batista, Cleidiel Aparecido Araujo Lemos, Caroline Cantieri Mello, Eduardo Piza Pellizzer
PURPOSE: The aim of this study was to use three-dimensional finite element analysis to analyze the stress distribution transferred by single implant-supported prostheses placed in the anterior maxilla using different connections (external hexagon, internal hexagon, or Morse taper), inclinations of the load (0, 30, or 60 degrees), and surgical techniques for placement (monocortical/conventional, bicortical, or bicortical with nasal floor elevation). MATERIALS AND METHODS: Nine models representing a bone block of this region were simulated by computer-aided design software (InVesalius, Rhinoceros, SolidWorks)...
July 2017: International Journal of Oral & Maxillofacial Implants
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