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https://www.readbyqxmd.com/read/28097386/biomechanical-analysis-of-clavicle-hook-plate-implantation-with-different-hook-angles-in-the-acromioclavicular-joint
#1
Li-Kun Hung, Kuo-Chih Su, Wen-Hsien Lu, Cheng-Hung Lee
PURPOSE: A clavicle hook plate is a simple and effective method for treating acromioclavicular dislocation and distal clavicle fractures. However, subacromial osteolysis and peri-implant fractures are complicated for surgeons to manage. This study uses finite element analysis (FEA) to investigate the post-implantation biomechanics of clavicle hook plates with different hook angles. METHODS: This FEA study constructed a model with a clavicle, acromion, clavicle hook plate, and screws to simulate the implantation of clavicle hook plates at different hook angles (90°, 95°, 100°, 105°, and 110°) for treating acromioclavicular joint dislocations...
January 18, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28089389/three-dimensional-finite-element-model-to-predict-patterns-of-pterygomaxillary-dysjunction-during-le-fort-i-osteotomy
#2
H Fujii, N Kuroyanagi, T Kanazawa, S Yamamoto, H Miyachi, K Shimozato
The aim of this study was to determine whether non-linear three-dimensional finite element analysis (3D-FEA) can be applied to simulate pterygomaxillary dysjunction during Le Fort I osteotomy (LFI) not involving a curved osteotome (LFI-non-COSep), and to predict potential changes in the fracture pattern associated with extending the cutting line. Computed tomography (CT) image data (100 snapshots) after LFI were converted to 3D-CT images. 3D-FEA models were built using preoperative CT matrix data and used to simulate pterygomaxillary dysjunction...
January 12, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28088646/bone-microarchitecture-in-adolescent-boys-with-autism-spectrum-disorder
#3
Ann M Neumeyer, Natalia Cano Sokoloff, Erin McDonnell, Eric A Macklin, Christopher J McDougle, Madhusmita Misra
BACKGROUND: Boys with autism spectrum disorder (ASD) have lower areal bone mineral density (aBMD) than typically developing controls (TDC). Studies of volumetric BMD (vBMD) and bone microarchitecture provide information about fracture risk beyond that provided by aBMD but are currently lacking in ASD. OBJECTIVES: To assess ultradistal radius and distal tibia vBMD, bone microarchitecture and strength estimates in adolescent boys with ASD compared to TDC. DESIGN/METHODS: Cross-sectional study of 34 boys (16 ASD, 18 TDC) that assessed (i) aBMD at the whole body (WB), WB less head (WBLH), hip and spine using dual X-ray absorptiometry (DXA), (ii) vBMD and bone microarchitecture at the ultradistal radius and distal tibia using high-resolution peripheral quantitative CT (HRpQCT), and (iii) bone strength estimates (stiffness and failure load) using micro-finite element analysis (FEA)...
January 11, 2017: Bone
https://www.readbyqxmd.com/read/28076414/a-mri-compatible-combined-mechanical-loading-and-mr-elastography-setup-to-study-deformation-induced-skeletal-muscle-damage-in-rats
#4
Jules L Nelissen, Larry de Graaf, Willeke A Traa, Tom J L Schreurs, Kevin M Moerman, Aart J Nederveen, Ralph Sinkus, Cees W J Oomens, Klaas Nicolay, Gustav J Strijkers
Deformation of skeletal muscle in the proximity of bony structures may lead to deep tissue injury category of pressure ulcers. Changes in mechanical properties have been proposed as a risk factor in the development of deep tissue injury and may be useful as a diagnostic tool for early detection. MRE allows for the estimation of mechanical properties of soft tissue through analysis of shear wave data. The shear waves originate from vibrations induced by an external actuator placed on the tissue surface. In this study a combined Magnetic Resonance (MR) compatible indentation and MR Elastography (MRE) setup is presented to study mechanical properties associated with deep tissue injury in rats...
2017: PloS One
https://www.readbyqxmd.com/read/28068473/optimizing-the-field-emission-properties-of-zno-nanowire-arrays-by-precisely-tuning-the-population-density-and-application-in-large-area-gated-field-emitter-arrays
#5
Yufeng Li, Zhipeng Zhang, Guofu Zhang, Long Zhao, Shaozhi Deng, Ningsheng Xu, Jun Chen
Zinc oxide (ZnO) nanowires are prepared for application in large area gated field emitter arrays (FEAs). By oxidizing Al-coated Zn films, the population density of the ZnO nanowires was tuned precisely by varying the thickness of the Al film. The nanowire density decreased linearly as the thickness of the Al film increased. Optimal field emission properties with a turn-on field of 6.21 V μm-1 and current fluctuations less than 1% are obtained. This can be explained by the minimized screening effect and good electrical conductivity of the back-contact layer...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28063377/finite-element-analysis-of-post-dental-implant-fixation-in-drilled-mandible-sites
#6
Adel Pirjamalineisiani, Mohsen Sarafbidabad, Nima Jamshidi, Fatemeh Abedi Esfahani
BACKGROUND: Implant loosening may occur after dental implant placement as a result of the mechanical conditions created around the implant. In this research, the effect of bone drilling conditions on the magnitude of stress created in newly-formed bone around the implant, after placement, was investigated using FEA analysis. METHOD: The simulations performed in this study were based on the three-dimensional (3D) shape of the created cavities, extracted from the drilled cortical bone of the jaws...
November 27, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28060270/building-finite-element-models-to-investigate-zebrafish-jaw-biomechanics
#7
Lucy H Brunt, Karen A Roddy, Emily J Rayfield, Chrissy L Hammond
Skeletal morphogenesis occurs through tightly regulated cell behaviors during development; many cell types alter their behavior in response to mechanical strain. Skeletal joints are subjected to dynamic mechanical loading. Finite element analysis (FEA) is a computational method, frequently used in engineering that can predict how a material or structure will respond to mechanical input. By dividing a whole system (in this case the zebrafish jaw skeleton) into a mesh of smaller 'finite elements', FEA can be used to calculate the mechanical response of the structure to external loads...
December 3, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28059268/optimization-of-lightweight-structure-and-supporting-bipod-flexure-for-a-space-mirror
#8
Yi-Cheng Chen, Bo-Kai Huang, Zhen-Ting You, Chia-Yen Chan, Ting-Ming Huang
This article presents an optimization process for integrated optomechanical design. The proposed optimization process for integrated optomechanical design comprises computer-aided drafting, finite element analysis (FEA), optomechanical transfer codes, and an optimization solver. The FEA was conducted to determine mirror surface deformation; then, deformed surface nodal data were transferred into Zernike polynomials through MATLAB optomechanical transfer codes to calculate the resulting optical path difference (OPD) and optical aberrations...
December 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/28054655/unique-local-bone-tissue-characteristics-in-iliac-crest-bone-biopsy-from-adolescent-idiopathic-scoliosis-with-severe-spinal-deformity
#9
Zhiwei Wang, Huanxiong Chen, Y Eric Yu, Jiajun Zhang, Ka-Yee Cheuk, Bobby K W Ng, Yong Qiu, X Edward Guo, Jack C Y Cheng, Wayne Y W Lee
Adolescent idiopathic scoliosis is a complex disease with unclear etiopathogenesis. Systemic and persistent low bone mineral density is an independent prognostic factor for curve progression. The fundamental question of how bone quality is affected in AIS remains controversy because there is lack of site-matched control for detailed analysis on bone-related parameters. In this case-control study, trabecular bone biopsies from iliac crest were collected intra-operatively from 28 severe AIS patients and 10 matched controls with similar skeletal and sexual maturity, anthropometry and femoral neck BMD Z-score to control confounding effects...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28048471/su-g-jep3-03-effect-of-robot-pose-on-beam-blocking-for-ultrasound-guided-sbrt-of-the-prostate
#10
S Gerlach, I Kuhlemann, F Ernst, C Fuerweger, A Schlaefer
PURPOSE: Ultrasound presents a fast, volumetric image modality for real-time tracking of abdominal organ motion. How-ever, ultrasound transducer placement during radiation therapy is challenging. Recently, approaches using robotic arms for intra-treatment ultrasound imaging have been proposed. Good and reliable imaging requires placing the transducer close to the PTV. We studied the effect of a seven degrees of freedom robot on the fea-sible beam directions. METHODS: For five CyberKnife prostate treatment plans we established viewports for the transducer, i...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046400/su-g-201-16-thermal-imaging-in-source-visualization-and-radioactivity-measurement-for-high-dose-rate-brachytherapy
#11
X Zhu, Y Lei, D Zheng, S Li, V Verma, M Zhang, S Chang, H Song, C Enke, S Zhou
PURPOSE: High Dose Rate (HDR) brachytherapy poses a special challenge to radiation safety and quality assurance (QA) due to its high radioactivity, and it is thus critical to verify the HDR source location and its radioactive strength. This study demonstrates a new method for measuring HDR source location and radioactivity utilizing thermal imaging. A potential application would relate to HDR QA and safety improvement. METHODS: Heating effects by an HDR source were studied using Finite Element Analysis (FEA)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28042449/stress-and-strain-distribution-in-three-different-mini-dental-implant-designs-using-in-implant-retained-overdenture-a-finite-element-analysis-study
#12
W Aunmeungtong, P Khongkhunthian, P Rungsiyakull
: Finite Element Analysis (FEA) has been used for prediction of stress and strain between dental implant components and bone in the implant design process. PURPOSE: Purpose of this study was to characterize and analyze stress and strain distribution occurring in bone and implants and to compare stress and strain of three different implant designs. MATERIALS AND METHODS: Three different mini dental implant designs were included in this study: 1...
October 2016: Oral & Implantology
https://www.readbyqxmd.com/read/28036091/poverty-related-adversity-and-emotion-regulation-predict-internalizing-behavior-problems-among-low-income-children-ages-8-11
#13
C Cybele Raver, Amanda L Roy, Emily Pressler, Alexandra M Ursache, Dana Charles McCoy
The current study examines the additive and joint roles of chronic poverty-related adversity and three candidate neurocognitive processes of emotion regulation (ER)-including: (i) attention bias to threat (ABT); (ii) accuracy of facial emotion appraisal (FEA); and (iii) negative affect (NA)-for low-income, ethnic minority children's internalizing problems (N = 338). Children were enrolled in the current study from publicly funded preschools, with poverty-related adversity assessed at multiple time points from early to middle childhood...
December 29, 2016: Behavioral Sciences
https://www.readbyqxmd.com/read/28032053/impact-of-implant-diameter-and-length-on-stress-distribution-in-osseointegrated-implants-a-3d-fea-study
#14
R Eazhil, Siva Vadivel Swaminathan, Madhan Gunaseelan, G Vijay Kannan, Chandrapandian Alagesan
AIMS AND OBJECTIVES: Dimension of dental implant is an important parameter which has a considerable impact on the biomechanical load transfer characters and its prognosis. Excessive stress in the bone-implant interface may result in the failure of the implant. The aim of this study was to evaluate the impact of implant diameter and length on neighboring tissues around the implant. The results of the study will help in developing a scientific methodology to select appropriate implant diameter and length...
November 2016: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28028798/a-biomechanical-view-on-stinger-diversity-in-scorpions
#15
Arie van der Meijden, Thomas Kleinteich
Scorpions have elongated metasomas that bear a telson, which is used as a stinger for venom injection. There is a remarkable diversity in the use of the stinger among scorpions, comprising defensive behavior, prey subjugation and mating. This diversity could be reflected by the shape of the telson, as different stinging behaviors will result in very different functional demands. Here we explored the diversity of telson shapes in scorpions by providing morphological measurements, such as curvature and tip angle, as well as by testing stingers under load using finite element analysis (FEA)...
December 28, 2016: Journal of Anatomy
https://www.readbyqxmd.com/read/28017958/theoretical-implications-of-periacetabular-osteotomy-in-various-dysplastic-acetabular-cartilage-defects-as-determined-by-finite-element-analysis
#16
Meng Xu, Wenrui Qu, Yanbing Wang, Lei Zhong, Zhe Zhu, Wei Li, Xin Zhao, Jincheng Wang, Yu Sun
BACKGROUND Different extents and locations of acetabular cartilage defect have been supposed to be a major cause of undesirable outcomes of periacetabular osteotomy (PAO) in patients with developmental dysplasia of the hip (DDH). This study aimed to verify whether different locations of cartilage deficiency affect the biomechanical environment in a three-dimensional model utilizing finite element analysis (FEA). MATERIAL AND METHODS We developed 3 DDH models - DDH-1 (normal shape), DDH-2 (superior defect), and DDH-3 (anterosuperior defect) - by deforming from a normal hip model...
December 26, 2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28000396/the-biomechanics-of-bony-facial-buttresses-in-south-african-australopiths-an-experimental-study-using-finite-element-analysis
#17
Justin A Ledogar, Stefano Benazzi, Amanda L Smith, Gerhard W Weber, Keely B Carlson, Paul C Dechow, Ian R Grosse, Callum F Ross, Brian G Richmond, Barth W Wright, Qian Wang, Craig Byron, Kristian J Carlson, Darryl J De Ruiter, Leslie C Pryor Mcintosh, David S Strait
Australopiths exhibit a number of derived facial features that are thought to strengthen the face against high and/or repetitive loads associated with a diet that included mechanically challenging foods. Here, we use finite element analysis (FEA) to test hypotheses related to the purported strengthening role of the zygomatic root and "anterior pillar" in australopiths. We modified our previously constructed models of Sts 5 (Australopithecus africanus) and MH1 (A. sediba) to differ in the morphology of the zygomatic root, including changes to both the shape and positioning of the zygomatic root complex, in addition to creating variants of Sts 5 lacking anterior pillars...
January 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27995981/iron-arsenides-with-three-dimensional-feas-layer-networks-can-n-1-2-fe1-xptx-2-3n-ptn-n-1-2as-n-1-n-2-2-n%C3%A2-%C3%A2-2-3
#18
Naoyuki Katayama, Seiichiro Onari, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Hiroshi Sawa
We report the comprehensive studies between synchrotron X-ray diffraction, electrical resistivity and magnetic susceptibility experiments for the iron arsenides Can(n+1)/2(Fe1-xPtx)(2+3n)Ptn(n-1)/2As(n+1)(n+2)/2 for n = 2 and 3. Both structures crystallize in the monoclinic space group P21/m (#11) with three-dimensional FeAs structures. The horizontal FeAs layers are bridged by inclined FeAs planes through edge-sharing FeAs5 square pyramids, resulting in triangular tunneling structures rather than the simple layered structures found in conventional iron arsenides...
December 20, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27995133/comparison-of-the-lag-screw-placements-for-the-treatment-of-stable-and-unstable-intertrochanteric-femoral-fractures-regarding-trabecular-bone-failure
#19
Talip Celik, Ibrahim Mutlu, Arif Ozkan, Yasin Kisioglu
Background. In this study, the cut-out risk of Dynamic Hip Screw (DHS) was investigated in nine different positions of the lag screw for two fracture types by using Finite Element Analysis (FEA). Methods. Two types of fractures (31-A1.1 and A2.1 in AO classification) were generated in the femur model obtained from Computerized Tomography images. The DHS model was placed into the fractured femur model in nine different positions. Tip-Apex Distances were measured using SolidWorks. In FEA, the force applied to the femoral head was determined according to the maximum value being observed during walking...
2016: Journal of Medical Engineering
https://www.readbyqxmd.com/read/27959807/ultrasonic-needles-for-bone-biopsy
#20
Andrew Mathieson, Robert Wallace, Rebecca Cleary, Li Li, Hamish Simpson, Margaret Lucas
Bone biopsy is an invasive clinical procedure where a bone sample is recovered for analysis during the diagnosis of a medical condition. When the architecture of the bone tissue is required to be preserved, a core-needle biopsy is taken. Although this procedure is performed while the patient is under local anaesthesia, the patient can still experience significant discomfort. Additionally, large haematoma can be induced in the soft tissue surrounding the biopsy site due to the large axial and rotational forces which are applied through the needle to penetrate bone...
December 7, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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