journal
MENU ▼
Read by QxMD icon Read
search

Computer Methods in Biomechanics and Biomedical Engineering

journal
https://www.readbyqxmd.com/read/29017357/automated-hexahedral-meshing-of-knee-cartilage-structures-application-to-data-from-the-osteoarthritis-initiative
#1
B Rodriguez-Vila, P Sánchez-González, I Oropesa, E J Gomez, D M Pierce
We propose a fully automated methodology for hexahedral meshing of patient-specific structures of the human knee obtained from magnetic resonance images, i.e. femoral/tibial cartilages and menisci. We select eight patients from the Osteoarthritis Initiative and validate our methodology using MATLAB on a laptop computer. We obtain the patient-specific meshes in an average of three minutes, while faithfully representing the geometries with well-shaped elements. We hope to provide a fundamentally different means to test hypotheses on the mechanisms of disease progression by integrating our patient-specific FE meshes with data from individual patients...
October 10, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28956450/non-newtonian-flow-induced-deformation-from-pressurized-cavities-in-absorbing-porous-tissues
#2
Aftab Ahmed, J I Siddique, Asif Mahmood
We investigate the behavior of a spherical cavity in a soft biological tissue modeled as a deformable porous material during an injection of non-Newtonian fluid that follows a power law model. Fluid flows into the neighboring tissue due to high cavity pressure where it is absorbed by capillaries and lymphatics at a rate proportional to the local pressure. Power law fluid pressure and displacement of a solid in the tissue are computed as function of radial distance and time. Numerical solutions indicate that shear thickening fluids exhibit less fluid pressure and induce small solid deformation as compared to shear thinning fluids...
September 28, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28952799/biomechanical-consequences-of-subtalar-joint-arthroereisis-in-treating-posterior-tibial-tendon-dysfunction-a-theoretical-analysis-using-finite-element-analysis
#3
Duo Wai-Chi Wong, Yan Wang, Tony Lin-Wei Chen, Aaron Kam-Lun Leung, Ming Zhang
Subtalar joint arthroereisis (SJA) has been introduced to control the hyperpronation in cases of flatfoot. The objective of this study is to evaluate the biomechanical consequence of SJA to restore the internal stress and load transfer to the intact state from the attenuated biomechanical condition induced by posterior tibial tendon dysfunction (PTTD). A three-dimensional finite element model of the foot and ankle complex was constructed based on clinical images of a healthy female (age 28 years, height 165 cm, body mass 54 kg)...
September 27, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28952363/identification-of-the-critical-level-of-implantation-of-an-osseointegrated-prosthesis-for-above-knee-amputees
#4
Elder Michael Andrango Castro, Svatava Konvickova, Matej Daniel, Zdenek Horak
The aim of our study was to identify potential critical levels of implantation of an osseointegrated prosthesis for above-knee amputees. The implant used was the OPRA system. It was inserted in the femur at four different amputation heights, characterized by their residual limb ratios (0.299, 0.44, 0.58 and 0.73). The stress and strain distribution was evaluated in the bone-implant system during walking, considering a body mass of 100 kg. Considerably high stimulus (11,489 με) in the tissue near the tip was found at the highest implantation level...
September 27, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28948846/the-influence-of-inertial-sensor-sampling-frequency-on-the-accuracy-of-measurement-parameters-in-rearfoot-running
#5
Christian Mitschke, Falk Zaumseil, Thomas L Milani
Increasingly, inertial sensors are being used for running analyses. The aim of this study was to systematically investigate the influence of inertial sensor sampling frequencies (SF) on the accuracy of kinematic, spatio-temporal, and kinetic parameters. We hypothesized that running analyses at lower SF result in less signal information and therefore the inability to sufficiently interpret measurement data. Twenty-one subjects participated in this study. Rearfoot strikers ran on an indoor running track at a velocity of 3...
September 26, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28929796/a-coordinated-control-strategy-for-insulin-and-glucagon-delivery-in-type-1-diabetes
#6
Pau Herrero, Jorge Bondia, Nick Oliver, Pantelis Georgiou
Type 1 diabetes is an autoimmune condition characterised by a pancreatic insulin secretion deficit, resulting in high blood glucose concentrations, which can lead to micro- and macrovascular complications. Type 1 diabetes also leads to impaired glucagon production by the pancreatic α-cells, which acts as a counter-regulatory hormone to insulin. A closed-loop system for automatic insulin and glucagon delivery, also referred to as an artificial pancreas, has the potential to reduce the self-management burden of type 1 diabetes and reduce the risk of hypo- and hyperglycemia...
September 20, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28895760/application-of-a-semi-automatic-cartilage-segmentation-method-for-biomechanical-modeling-of-the-knee-joint
#7
Mimmi K Liukkonen, Mika E Mononen, Petri Tanska, Simo Saarakkala, Miika T Nieminen, Rami K Korhonen
Manual segmentation of articular cartilage from knee joint 3D magnetic resonance images (MRI) is a time consuming and laborious task. Thus, automatic methods are needed for faster and reproducible segmentations. In the present study, we developed a semi-automatic segmentation method based on radial intensity profiles to generate 3D geometries of knee joint cartilage which were then used in computational biomechanical models of the knee joint. Six healthy volunteers were imaged with a 3T MRI device and their knee cartilages were segmented both manually and semi-automatically...
September 12, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28895759/validation-of-plantar-pressure-simulations-using-finite-and-discrete-element-modelling-in-healthy-and-diabetic-subjects
#8
W Aerts, A Scarton, F De Groote, A Guiotto, Z Sawacha, C Cobelli, J Vander Sloten, I Jonkers
Plantar pressure simulation driven by integrated 3D motion capture data, using both a finite element and a discrete element model, is compared for ten healthy and ten diabetic neuropathic subjects. The simulated peak pressure deviated on average between 16.7 and 34.2% from the measured peak pressure. The error in the position of the peak pressure was on average smaller than 4.2 cm. No method was more accurate than the other although statistical differences were found between them. Both techniques are thus complementary and useful tools to better understand the alteration of diabetic foot biomechanics during gait...
September 12, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28872350/strategies-towards-rapid-generation-of-forefoot-model-incorporating-realistic-geometry-of-metatarsals-encapsulated-into-lumped-soft-tissues-for-personalized-finite-element-analysis
#9
Wen-Ming Chen, Sung-Jae Lee, Peter Vee Sin Lee
Use of finite element (FE) foot model as a clinical diagnostics tool is likely to improve the specificity of foot injury predictions in the diabetic population. Here we proposed a novel workflow for rapid construction of foot FE model incorporating realistic geometry of metatarsals encapsulated into lumped forefoot's soft tissues. Custom algorithms were implemented to perform unsupervised segmentation and mesh generation to directly convert CT data into a usable FE model. The automatically generated model provided higher efficiency and comparable numerical accuracy when compared to the model constructed using a traditional solid-based mesh process...
September 5, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28836464/flow-visualisation-study-of-spiral-flow-in-the-aorta-renal-bifurcation
#10
David Fulker, Ashkan Javadzadegan, Zuming Li, Tracie Barber
The aim of this study was to analyse the flow dynamics in an idealised model of the aorta-renal bifurcation using flow visualisation, with a particular focus on the effect of aorta-to-renal flow ratio and flow spirality. The recirculation length was longest when there was low flow in the renal artery and smaller in the presence of spiral flow. The results also indicate that patients without spiral flow or who have low flow in the renal artery due to the presence of stenosis may be susceptible to heightened development of atherosclerotic lesions...
August 24, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28836461/a-musculoskeletal-model-to-estimate-the-relative-changes-in-wrist-strength-due-to-interacting-wrist-and-forearm-postures
#11
Nicholas J La Delfa, Jim R Potvin
Wrist rotations about one wrist axis (e.g. flexion/extension) can affect the strength about another wrist axis (e.g. radial/ulnar deviation). This study used a musculoskeletal model of the distal upper extremity, and an optimization approach, to quantify the interaction effects of wrist flexion/extension (FE), radial/ulnar deviation (RUD) and forearm pronation/supination (PS) on wrist strength. Regression equations were developed to predict the relative changes in strength from the neutral posture, so that the changes in strength, due to complex and interacting wrist and forearm rotation postures, can be incorporated within future ergonomics assessments of wrist strength...
August 24, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28836460/effect-of-lumbar-fasciae-on-the-stability-of-the-lower-lumbar-spine
#12
Hae Won Choi, Young Eun Kim
The biomechanical effect of tensioning the lumbar fasciae (LF) on the stability of the spine during sagittal plane motion was analysed using a validated finite element model of the normal lumbosacral spine (L4-S1). To apply the tension in the LF along the direction of the fibres, a local coordinate was allocated using dummy rigid beam elements that originated from the spinous process. Up to 10 Nm of flexion and 7.5 Nm of extension moment was applied with and without 20 N of lateral tension in the LF. A follower load of 400 N was additionally applied along the curvature of the spine...
August 24, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28836455/antagonist-muscle-co-contraction-during-a-double-leg-landing-maneuver-at-two-heights
#13
Hossein Mokhtarzadeh, Chen Hua Yeow, James Cho Hong Goh, Denny Oetomo, Katie Ewing, Peter Vee Sin Lee
BACKGROUND: Knee injuries are common during landing activities. Greater landing height increases peak ground reaction forces (GRFs) and loading at the knee joint. As major muscles to stabilize the knee joint, Quadriceps and Hamstring muscles provide internal forces to attenuate the excessive GRF. Despite the number of investigations on the importance of muscle function during landing, the role of landing height on these muscles forces using modeling during landing is not fully investigated...
August 24, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28830232/influence-of-ground-reaction-force-perturbations-on-anterior-cruciate-ligament-loading-during-sidestep-cutting
#14
Joshua T Weinhandl, Kristian M O'Connor
Anterior cruciate ligament (ACL) injury risk is likely increased under unexpected loading conditions. Such situations may arise from mid-air contact with another athlete, or misjudgments in landing height, stride length or surface compliance resulting in an unbalanced landing and unexpected changes in the ground reaction forces (GRFs). The purpose this study was to identify how GRF perturbations influence ACL loading during sidestep cutting. Muscle-actuated simulations of sidestep cutting were generated and analyzed for 20 subjects...
August 22, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28817976/an-open-source-model-and-solution-method-to-predict-co-contraction-in-the-finger
#15
Alexander R MacIntosh, Peter J Keir
A novel open-source biomechanical model of the index finger with an electromyography (EMG)-constrained static optimization solution method are developed with the goal of improving co-contraction estimates and providing means to assess tendon tension distribution through the finger. The Intrinsic model has four degrees of freedom and seven muscles (with a 14 component extensor mechanism). A novel plugin developed for the OpenSim modelling software applied the EMG-constrained static optimization solution method...
August 17, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28817960/effectiveness-of-pedicle-screw-inclusion-at-the-fracture-level-in-short-segment-fixation-constructs-for-the-treatment-of-thoracolumbar-burst-fractures-a-computational-biomechanics-analysis
#16
Shady Elmasry, Shihab Asfour, Francesco Travascio
When treating thoracolumbar burst fractures (BF), short-segment posterior fixation (SSPF) represents a less invasive alternative to the traditional long-segment posterior fixation (LSPF) approach. However, hardware failure and loss of sagittal alignment have been reported in patients treated with SSPF. Including pedicle screws at the fracture level in SSPF constructs has been proposed to improve stiffness and reliability of the construct. Accordingly, the biomechanical performance of the proposed construct was compared to LSPF via a computational analysis...
August 17, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28812366/a-combination-of-experimental-measurement-constitutive-damage-model-and-diffusion-tensor-imaging-to-characterize-the-mechanical-properties-of-the-human-brain
#17
Alireza Karimi, Seyed Mohammadali Rahmati, Reza Razaghi
Understanding the mechanical properties of the human brain is deemed important as it may subject to various types of complex loadings during the Traumatic Brain Injury (TBI). Although many studies so far have been conducted to quantify the mechanical properties of the brain, there is a paucity of knowledge on the mechanical properties of the human brain tissue and the damage of its axon fibers under the various types of complex loadings during the Traumatic Brain Injury (TBI). Although many studies so far have been conducted to quantify the mechanical properties of the brain, there is a paucity of knowledge on the mechanical properties of the human brain tissue and the damage of its axon fibers under the frontal lobe of the human brain...
August 16, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28793805/fatigue-failure-of-the-sliding-hip-screw-clinical-and-biomechanical-analysis
#18
Libor Necas, Maros Hrubina, Zoltan Cibula, Jiri Behounek, Stanislav Krivanek, Zdenek Horak
The study was aimed at the clinical and biomechanical analyses of the sliding hip screw breakage with the use of finite element method. We have identified two patients with the sliding screw breakage. In the first patient, the biomechanical analysis revealed the reduced stress values σHMH not exceeding the yield limit or strength limit of the implant. The yield limit was exceeded in second one. Clinical and biomechanical analyses have demonstrated that adherence to technical requirements of the appropriate osteosynthesis implementation is the principal condition of timely healing since it prevents the material failure...
August 9, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28782386/glottis-effects-on-the-cough-clearance-process-simulated-with-a-cfd-dynamic-mesh-and-eulerian-wall-film-model
#19
Concepción Paz, Eduardo Suárez, Oscar Parga, Jesús Vence
In this study, we have reproduced the cough clearance process with an Eulerian wall film model. The simulated domain is based on realistic geometry from the literature, which has been improved by adding the glottis and epiglottis. The vocal fold movement has been included due to the dynamic mesh method, considering different abduction and adduction angles and velocities. The proposed methodology captures the deformation of the flexible tissue, considers non-Newtonian properties for the mucus, and enables us to reproduce a single cough or a cough epoch...
August 7, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28768423/biomechanical-comparison-of-conventional-and-optimised-locking-plates-for-the-fixation-of-intraarticular-calcaneal-fractures-a-finite-element-analysis
#20
Hanbin Ouyang, Yuping Deng, Pusheng Xie, Yang Yang, Bingyun Jiang, Canjun Zeng, Wenhua Huang
Intraarticular calcaneal fractures can result in poor prognosis. Although operative fixation can improve the functional outcomes in most cases, surgical complications such as loss of reduction and wound healing problems may increase the risk of reoperation. Hence, this study aimed to design calcaneal locking plate with a lower profile and better biomechanical performance   and to compare the redesigned plate with the traditional calcaneal plate via the finite element method. A Sanders' type II-C intraarticular calcaneal fracture was simulated...
August 3, 2017: Computer Methods in Biomechanics and Biomedical Engineering
journal
journal
32931
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"