Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Lateral Bending"”.
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Biomechanics of the canine thoracolumbar spine in lateral bending
… were surgically altered by facetectomy, lateral fenestration, diskectomy, and combinations of these procedures. Specimens were subjected to lateral bending at a rate of 2.5 cm per minute to failure in a swing arm bending jig designed to simulate four point bending. The slopes of bending …
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Cervical Spine Tolerance And Response In Compressive Loading Modes Including Combined Compression And Lateral Bending
… safety researchers have observed noticeable lateral bending of the anthropomorphic test device (ATD) neck prior to or in conjunction with head impact with the vehicle roof in rollover crash tests. Since there is scant data available about the effects of lateral bending on overall compressive …
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Passive Stiffness Characteristics of the Scoliotic Lumbar Torso in Trunk Flexion, Extension, Lateral bending, and Axial Rotation
… participated in three different tests (torso lateral side bending, torso axial rotation, and torso flexion/extension) that isolated mobility to the in vivo lumbar spine. Scoliotic individuals with Cobb angles ranging 15-75 degrees were accepted. Applied torque was measured using a …
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A Passive Pure Moment Protocol for Testing Spine Segments: Development and Application
… of rotation (IAR) for a segment throughout a bending motion. The purpose of this study was to simulate a pure moment protocol using a programmable spine robot, and use the data gathered to calculate the IAR for harvested specimen and those implanted with a constrained total disc replacement …
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Interrater and intrarater reliability of the Acumar™ digital inclinometer for measurement of cervical range of motion in children with torticollis
… of cervical range of motion for rotation, lateral bending, and midline alignment with a digital inclinometer. Fifteen measurements were taken by two different testers. Each tester repeated the same fifteen measurements separated by a brief time interval. Intraclass correlation coefficients …
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The behaviour of curved hybrid girders
… a girder's load pattern by causing additional lateral bending moments. Lateral bending moments reduce the vertical load carrying capacity of a girder and cause the flanges to be unequally stressed. For the girder and spans investigated, there is a reduction of 57% in ultimate load for radius to …
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Investigation and empirical evaluation of inputs to optimization-based biomechanical trunk models
… three types of moments, flexion/extension, lateral bending, and torsional. The results indicated large differences in the predicted forces due to the different models and muscle geometries. Changes in force predictions for identical muscles were also found when the number of muscles in the …
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A Computer Simulation Model of The Human Head-Neck Musculoskeletal System
… The primary neck muscles for axial rotation, lateral bending, extension, and flexion movements were defined, respectively. For each specific movement, the model was driven by muscle length control using three different muscle sets: (1) all the inclusive primary muscles (“All muscles” mode), …
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Analytical Evaluations of Buckling Behavior of Wood Composite I-Joist with Sinusoidal Web
Flexural-torsional buckling or lateral torsional buckling is an important limit state for wood composite I-joist because the in-plane bending stiffness is typically greater than torsional lateral bending stiffness. Web local buckling is another important limit state because of the thin-walled web …
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A patient specific total disc replacement to treat degenerative disc disease
… stiffness in compression, flexion/extension, lateral bending, and axial rotation. A version of this geometry was then fabricated using an inkjet printed plastic and polydimethylsiloxane (PDMS) and tested in a six-axis spine simulator to validate the FE simulations. To relate the mechanics of …
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Finite Element and Probabilistic Analysis of Soft Tissue Structures of the Human Lumbar Spine
… from compression, extension, flexion, and lateral bending. Optimization was used to calibrate the model parameters. Constitutive model types and the number of zones were compared. The best combination was a linear elastic constitutive model representing the nucleus pulposis and a …
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SuperLoad Crossing of Millard Avenue Bridges Over Duck Creek and CSX Railroad
… for the Duck Creek bridge. An examination of the lateral bending strain at the splices for the CSX bridge.The field and analytical strain fit well for the superload crossing. The diagnostic tests showed no observable change before and after the superload crossing.
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Kinematic analysis of compensation movements of upper limb amputees and able-bodied individuals during grasping movements
… flexion-extension and upper and lower trunk lateral bending. Nine able-bodied individuals and two transradial prostheses users participated in the study. Both prosthesis users had over two years of experience with the device and use it daily. The device that the amputees used was i-Limb …
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Biomechanical Comparison of Lumbar Disc Replacements
… tested in flexion, extension, left and right lateral bending, and left and right axial rotation. Testing conditions, in order, were the harvested state, ProDisc-L at L5-S1, Maverick at L5-S1, and a pedicle screw fixation at L5-S1. ProDisc-L was less flexible than Maverick in flexion but …
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Biomechanical Testing of Two-Level Cervical Disc Arthroplasty
… in physiologic flexion-extension, lateral bending, and axial rotation to an end-limit load of 3-Nm or 45o rotation. Rotations at the superior, implanted, and inferior motion segment units (MSU) of the instrumented conditions were normalized to the non-instrumented condition and …
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An In Vivo histological, and In Vitro biomechanical study of nucleus replacement with a novel polymeric hydrogel
… motion segments loaded in axial rotation, lateral bending, flexion/extension (FE) and compression. Specimens were tested sequentially in the intact state, following annulotomy, discectomy and after hydrogel treatment. Range of Motion (ROM) in FE was shown to increase from the intact state …
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A Virtual Model of the Human Cervical Spine for Physics-based Simulation and Applications
… in facet loading during flexion, extension, and lateral bending. Un-constraining the spherical joint to a plane at the disc level minimized facet load build up.</p> <p>The virtual model bridges the gap between the cadaveric-based in vitro tests and clinicalbased experimental studies to further …
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Patient-specific technology for in vivo assessment of 3-D spinal motion
… were acquired during both flexion-extension and lateral bending motions of cadaveric cervical (C4-T1) and lumbar (L2-S1) spine. Registration of the bi-planar fluoroscopic images to the CT-based 3-D model was optimized using a gradient derived similarity function. Additionally, a stochastic …
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The effect of a commercially available abdominal support belt on torso posture, lift strength, and spinal compression
… determine if there was a change in flexion and lateral bending angle of the torso across Belt conditions. Axial twist angle between the shoulders and the hips was also investigated. Strength data was collected through a force platform across three orthogonal axes. Spinal compression was …
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Use of Compliant Interbody Force Sensing Grafts to Compare Load Sharing Properties of Unidirectional and Bidirectional Multilevel Dynamic Translational Anterior Cervical Plates
… and tested in flexion-extension, left-right lateral bending, and left-right axial rotation under displacement control to a load limit of 3.0 Nm or 30 degrees of motion. Four different spine conditions were evaluated: the harvested (H) condition and three types of instrumented conditions …
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