Journal of Biomechanical Engineering http://scitation.aip.org/ Journal of Biomechanical Engineering A One-Dimensional Model of the Spinal Cerebrospinal-Fluid Compartment http://link.aip.org/link/doi/10.1115/1.4005853 Serge Cirovic and Minsuok Kim<br/> Background. Modeling of the cerebrospinal fluid (CSF) system in the spine is strongly motivated by the need to understand the origins of pathological conditions such as the emergence and growth of fluid-filled cysts in the spinal cord. In this study, a one-dimensional (1D) approximation for the flow ... [J. Biomech. Eng. doi:10.1115/1.4005853] posted Wed Feb 1, 2012. Biaxial Tensile Testing and Constitutive Modeling of Human Supraspinatus Tendon http://link.aip.org/link/doi/10.1115/1.4005852 Dawn M. Elliott, Spencer E Szczesny, John M Peloquin, Daniel Cortes, Jennifer A. Kadlowec, and Louis Soslowsky<br/> The heterogeneous composition and mechanical properties of the supraspinatus tendon offer an opportunity for studying the structure-function relationships of fibrous musculoskeletal connective tissues. Previous uniaxial testing has demonstrated a correlation between the collagen fiber angle distribu ... [J. Biomech. Eng. doi:10.1115/1.4005852] posted Wed Feb 1, 2012. In Vitro Articular Cartilage Growth with Sequential Application 1 of IGF-1 and TGF-beta1 Enhances Volumetric Growth and Maintains Compressive Properties http://link.aip.org/link/doi/10.1115/1.4005851 Stephen Klisch, Nathan T Balcom, Britta Berg-Johansen, Kristin J Dills, Jennifer R Van Donk, and Gregory M Williams<br/> In vitro cultures with insulin-like growth factor-1 (IGF-1) and transforming growth factor-beta 1 (TGF-beta1) have previously been shown to differentially modulate the growth of immature bovine articular cartilage. IGF-1 stimulates expansive growth yet decreases compressive moduli and increases comp ... [J. Biomech. Eng. doi:10.1115/1.4005851] posted Wed Feb 1, 2012. Syrinx fluid transport: modeling pressure-wave-induced flux across the spinal pial membrane http://link.aip.org/link/doi/10.1115/1.4005849 Novak Elliott<br/> Syrinxes are fluid-filled cavities of the spinal cord that characterize syringomyelia, a disease involving neurological damage. Their formation and expansion is poorly understood which has hindered successful treatment. Syrinx cavities are hydraulically connected with the spinal subarachnoid space ( ... [J. Biomech. Eng. doi:10.1115/1.4005849] posted Wed Feb 1, 2012. Computational Modeling of Shear-Based Hemolysis due to Renal Obstruction http://link.aip.org/link/doi/10.1115/1.4005850 Polina A. Segalova, K. T. Rao, Christopher K. Zarins, and Charles A. Taylor<br/> Background: As endovascular treatment of abdominal aortic aneurysms (AAAs) gains popularity, it's becoming possible to treat certain challenging aneurysmal anatomies with endografts relying on suprarenal fixation. In such anatomies, the bare struts of the device may be placed across the renal artery ... [J. Biomech. Eng. doi:10.1115/1.4005850] posted Wed Jan 25, 2012. Rotational Stiffness of Football Shoes Influences Talus Motion during External Rotation of the Foot http://link.aip.org/link/doi/10.1115/1.4005695 Roger Haut, Feng Wei, Eric G. Meyer, Jerrod E. Braman, and John W. Powell<br/> Shoe-surface interface characteristics have been implicated in the high incidence of ankle injuries suffered by athletes. Yet, the differences in rotational stiffness among shoes may also influence injury risk. It was hypothesized that shoes with different rotational stiffness will generate differen ... [J. Biomech. Eng. doi:10.1115/1.4005695] posted Wed Jan 25, 2012. Using In Vivo Cine and 3D Multi-Contrast MRI to Determine Human Atherosclerotic Carotid Artery Material Properties and Circumferential Shrinkage Rate and Their Impact on Stress/Strain Predictions http://link.aip.org/link/doi/10.1115/1.4005685 Dalin Tang, Haofei Liu, Gador Canton, Chun Yuan, Chun Yang, Kristen Billiar, Zhongzhao Teng, and Allen H. Hoffman<br/> Background. In vivo magnetic resonance image (MRI)-based computational models have been introduced to calculate atherosclerotic plaque stress and strain conditions for possible rupture predictions. However, patient-specific vessel material properties are lacking in those models which affect the acc ... [J. Biomech. Eng. doi:10.1115/1.4005685] posted Tue Jan 24, 2012. Investigation of Saccadic Eye Movement Effects on the Fluid Dynamic in the Anterior Chamber http://link.aip.org/link/doi/10.1115/1.4005762 Omid Abouali, Amirreza Modareszadeh, Alireza Ghaffariyeh, and Jiyuan Tu<br/> The aqueous humor (AH) flow in the anterior chamber (AC) due to saccadic movements is investigated in this research. The continuity, Navier-Stokes and energy equations in 3-D and unsteady forms are solved numerically and the saccadic motion was modeled by dynamic mesh technique. Firstly, the numeric ... [J. Biomech. Eng. doi:10.1115/1.4005762] posted Tue Jan 24, 2012. Partial Meniscectomy Changes Fluid Pressurization in Articular Cartilage in Human Knees http://link.aip.org/link/doi/10.1115/1.4005764 LePing Li<br/> Partial meniscectomy is believed to change the biomechanics of the knee joint through alterations in the contact of articular cartilages and menisci. Although fluid pressure plays an important role in the load support mechanism of the knee, the fluid pressurization in the cartilages and menisci has ... [J. Biomech. Eng. doi:10.1115/1.4005764] posted Tue Jan 24, 2012. Viscoelastic Material Properties of the Myocardium and Cardiac Jelly in the Looping Chick Heart http://link.aip.org/link/doi/10.1115/1.4005693 Jiang Yao, Victor D. Varner, Lauren L. Brilli, Jonathan M. Young, Larry A. Taber, and Renato Perucchio<br/> Accurate material properties of developing embryonic tissues are a crucial factor in studies of the mechanics of morphogenesis. In the present work, we characterize the viscoelastic material properties of the looping heart tube in the chick embryo through nonlinear finite element modeling and microi ... [J. Biomech. Eng. doi:10.1115/1.4005693] posted Tue Jan 24, 2012. A Three-Dimensional Inverse Finite Element Analysis of the Heel Pad http://link.aip.org/link/doi/10.1115/1.4005692 Ahmet Erdemir, Snehal Chokhandre, Jason P. Halloran, and Antonie van den Bogert<br/> Background. Quantification of plantar tissue behavior of the heel pad is essential in developing computational models for predictive analysis of preventive treatment options like footwear for patients with diabetes. Simulation based studies in the past have generally adopted heel pad properties from ... [J. Biomech. Eng. doi:10.1115/1.4005692] posted Tue Jan 24, 2012. A Semi-Empirical Cell Dynamics Model for Bone Turnover under External Stimulus http://link.aip.org/link/doi/10.1115/1.4005761 E. O. Carew<br/> Background. The normal periodic turnover of bone is referred to as remodeling. In remodeling, old or damaged bone is removed during a `resorption' phase and new bone is formed in its place during a `formation' phase in a sequence of events known as coupling. Resorption is preceded by an `activation' ... [J. Biomech. Eng. doi:10.1115/1.4005761] posted Tue Jan 24, 2012. The Biomechanical Effect of Torsion on Humeral Shaft Repair Techniques for Completed Pathological Fractures http://link.aip.org/link/doi/10.1115/1.4005696 Rad Zdero, Ahmed Al-Jahwari, Emil H. Schemitsch, Jay S. Wunder, and Peter C. Ferguson<br/> In the presence of a tumor defect, completed humeral shaft fractures continue to be a major surgical challenge since there is no "gold standard" treatment. This is due, in part, to the fact that only one prior biomechanical study exists on the matter, but which only compared 2 repair methods. The cu ... [J. Biomech. Eng. doi:10.1115/1.4005696] posted Tue Jan 24, 2012. Finite Element Aortic Injury Reconstruction of Near Side Lateral Impacts Using Real World Crash Data http://link.aip.org/link/doi/10.1115/1.4005684 Aditya Belwadi, John H Siegel, Aadarsh Singh, Joyce A Smith, King H. Yang, and Albert I. King<br/> Traumatic rupture of the aorta `TRA ' remains the second most common cause of death associated with motor vehicle crashes, only less prevalent than brain injury. On an average, nearly 8,000 people die annually in the United States due to blunt injury to the aorta. It is observed that over 80% of o ... [J. Biomech. Eng. doi:10.1115/1.4005684] posted Tue Jan 24, 2012. A novel sensor concept for optimization of loosening diagnostics in total hip replacement http://link.aip.org/link/doi/10.1115/1.4005222 Catherine Ruther, Hartmut Ewald, Wolfram Mittelmeier, Rainer Bader, and Daniel Kluess<br/> Background: The major reason for revision of total hip replacements (THR) is aseptic loosening, caused by stress shielding and wear-particle-induced osteolysis. The osseous anchorage of the uncemented hip stem must be measured exactly in order to enable early detection of loosening. Currently applie ... [J. Biomech. Eng. doi:10.1115/1.4005222] posted Fri Nov 4, 2011. A non-linear biphasic fiber-reinforced porohyperviscoelastic (BFPHVE) model of articular cartilage incorporating fiber reorientation and dispersion http://link.aip.org/link/doi/10.1115/1.4004832 Marcello Papini, Alireza Seifzadeh, Donatus C Oguamanam, and Jian Wang<br/> A non-linear biphasic fiber-reinforced poro-hyper-visco-elastic (BFPHVE) model of articular cartilage incorporating fiber reorientation effects during applied load was used to predict the response of ovine articular cartilage at relatively high strains (20%). The constitutive material parameters wer ... [J. Biomech. Eng. doi:10.1115/1.4004832] posted Tue Sep 6, 2011. Finite Element Implementation of Mechano-Chemical Phenomena in Neutral Deformable Porous Media Under Finite Deformation http://link.aip.org/link/doi/10.1115/1.4004810 Gerard A. Ateshian, Michael B. Albro, Steve Maas, and Jeffrey A. Weiss<br/> Biological soft tissues and cells may be subjected to mechanical as well as chemical (osmotic) loading under their natural physiological environment or various experimental conditions. The interaction of mechanical and chemical effects may be very significant under some of these conditions, yet the ... [J. Biomech. Eng. doi:10.1115/1.4004810] posted Tue Sep 6, 2011. INFLUENCE OF EXPERIMENTAL PROTOCOLS ON THE MECHANICAL PROPERTIES OF THE INTERVERTEBRAL DISC IN UNCONFINED COMPRESSION. http://link.aip.org/link/doi/10.1115/1.4004411 Delphine Perie, Maximilien Recuerda, Simon-Pierre Cote, and Isabelle Villemure<br/> The lack of standardization in experimental protocols for unconfined compression tests of intervertebral discs (IVD) tissues is a major issue in the quantification of their mechanical properties. Our hypothesis is that the experimental protocols influence the mechanical properties of both annulus fi ... [J. Biomech. Eng. doi:10.1115/1.4004411] posted Tue Sep 6, 2011. The Tolerance of the Maxilla to Blunt Impact http://link.aip.org/link/doi/10.1115/1.4004248 Joseph Cormier, Sarah Manoogian, Jill Bisplinghoff, Steven Rowson, Anthony Santago, and Craig McNally<br/> This study reports the results of thirty-eight infraorbital maxilla impacts performed on male cadavers. Impacts were performed using an unpadded, cylindrical impactor (3.2 kg) at velocities between 1 and 5 m/s. The peak force and acoustic emission data were used to develop a statistical relationsh ... [J. Biomech. Eng. doi:10.1115/1.4004248] posted Fri Jun 17, 2011. Transversely Isotropic Elasticity Imaging of Cancellous Bone http://link.aip.org/link/doi/10.1115/1.4004231 Spencer W. Shore, Prof. Paul Barbone, Prof. Assad Oberai, and Elise F. Morgan<br/> Background: In order to measure spatial variations in mechanical properties of biological materials, prior studies have typically performed mechanical tests on excised specimens of tissue. Non-invasive measurements, however, are preferable in many applications, such as patient-specific modeling, dis ... [J. Biomech. Eng. doi:10.1115/1.4004231] posted Fri Jun 17, 2011. In Vivo Serial MRI-Based Models and Statistical Methods to Quantify Sensitivity and Specificity of Mechanical Predictors for Carotid Plaque Rupture: Location and Beyond http://link.aip.org/link/doi/10.1115/1.4004189 Dalin Tang, Zheyang Wu, and Chun Yang<br/> Background and Purpose. It has been hypothesized that mechanical risk factors may be used to predict future atherosclerotic plaque rupture. Truly predictive methods for plaque rupture and methods to identify the best predictor(s) from all the candidates are lacking in the literature. A novel comb ... [J. Biomech. Eng. doi:10.1115/1.4004189] posted Fri Jun 17, 2011. Patient-specific FE analyses of the proximal femur with orthotropic material properties validated by experiments http://link.aip.org/link/doi/10.1115/1.4004180 Zohar Yosibash and Nir Trabelsi<br/> Background: Patient-specific high order finite-element (FE) models of human femurs based on quantitative computer tomography (QCT) with inhomogeneous orthotropic and isotropic material properties are addressed. The point-wise orthotropic properties are determined by a micro-mechanics (MM) based appr ... [J. Biomech. Eng. doi:10.1115/1.4004180] posted Fri Jun 17, 2011. Spatial Correlations of Trabecular Bone Microdamage with Local Stresses and Strains Using Rigid Image Registration http://link.aip.org/link/doi/10.1115/1.4004164 Robert Guldberg, Srinidhi Nagaraja, and Oskar Skrinjar<br/> Although microdamage is known to accumulate in trabecular bone with over-loading and aging, the tissue-level stresses and strains associated with local bone failure are not well known. Local correlation of microdamage with microstructural stresses and strains requires methods to accurately register ... [J. Biomech. Eng. doi:10.1115/1.4004164] posted Fri Jun 17, 2011. A Mixed Boundary Representation to Simulate the Displacement of a Biofluid by a Biomaterial in Porous Media http://link.aip.org/link/doi/10.1115/1.4003735 Rene P. Widmer and Stephen J. Ferguson<br/> Characterization of the biomaterial flow through porous bone is crucial for the success of the bone augmentation process in vertebroplasty. The biofluid, biomaterial and local morphological bone characteristics determine the final shape of the filling, which is important both for the post-treatment ... [J. Biomech. Eng. doi:10.1115/1.4003735] posted Tue Sep 6, 2011. Discussion: Stress changes in intervertebral discs of cervical spine due to partial discectomies and fusion (Tchako, A., and Sadegh, A. M., 2009, J Biomech Eng 131(5), p. 051013) http://link.aip.org/link/doi/10.1115/1.4000873 Lei Wei, Yabo Yan, Yang Zhang, and Wei Qi<br/> ... [J. Biomech. Eng. doi:10.1115/1.4000873] posted Tue Dec 22, 2009.