Download or read book Mechanical Properties of Lumbar Cancellous Bone and Finite Element Analysis of the L2 L3 Motion Segment written by Rajesh Anantharaman and published by . This book was released on 2004 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Finite Element Analysis of an Instrumented Lumbar Vertebra written by Ronald Mark McGregor and published by . This book was released on 1995 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Three Dimensional Finite Element Model to Study the Biomechanical and Kinematic Characteristics of the Human Lumbar Spine in Flexion written by Dhruv Jitesh Mehta and published by . This book was released on 2007 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the research was to develop a three-dimensional finite element model to study the biomechanical and kinematic characteristics of the human lumbar spine in flexion. An analytical model of the lumbar spine capable of taking into consideration the actual geometry, non-linear material properties and realistic loading would be of benefit in studying normal biomechanics, as well as in-vivo behavior in injured and surgically altered spines. Fundamental to this approach is an accurate model of the spine. This was achieved by modeling the lumbar segments L2-L4 from Computed Tomography (CT) data and analyzing them under loading conditions that best approximated the human lumbar segments in flexion. An in-vitro study was performed for validation of the finite element model. Human lumbar cadaveric spinal segments (L2-L4) were loaded based on test conditions similar to those defined in the finite element analysis. The results of the cadaver biomechanical study and finite element analysis were compared. The results suggest that the model is a valid approach to assessing the range of motion of the L3 segment under flexion. Rotation under lateral bending moments was additionally investigated to provide a thorough validation of the model.
Download or read book An Analytical Investigation of Ligamentous Lumbar Spine Mechanics written by Kim Young Eun and published by . This book was released on 1988 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Measurements of Lumbar Spine Biomechanics to Validate a Finite Element Model of the Lumbar Spine written by Michael James Schendel and published by . This book was released on 1990 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Biomechanical Properties and Mechanobiological Behavior of a Spinal Motion Segment with Scoliosis Treatment Using Finite Element Analysis written by Bharathwaj Kumar and published by . This book was released on 2011 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scoliosis is a musculoskeletal abnormality causing complex three dimensional curvatures in the spine. Current surgical treatments for this adolescent spinal deformity are successful but invasive. Potential new treatments that are less invasive are being developed based on altering growth by mechanically redistributing stresses across the vertebral growth plates. In the literature, in vivo and in vitro tests have shown biomechanical changes in the disc and growth plates due to insertion of staple like implants used in these new methods. In order to understand the biomechanics behind these potential new methods, a nonlinear finite element analysis (FEA) is performed and various biomechanical properties of the spinal segment with and without the implant are determinedA three-dimensional FE model of T7-T8 motion segment was developed from a CT scan of a porcine spine and imported to ABAQUS (an FEA software). Various material properties and contact interactions were used from the literature in determining the model that best predicted the available experimental load-displacement curve and the compressive properties of the disc. Bending loads were applied to this FE model to determine the reduction in the motion of the spinal segment. Sensitivity of the implant features were examined against the compressive properties of the disc. Mechanobiological growth models have been partially developed to study various biomechanical factors causing deformities in spine. This available model was utilized in understanding how growth in a normal spine could be influenced due to the presence of these implants.
Download or read book A Finite Element Study of Intervertebral Cages and Spinal Bone Remodelding written by Young Kim and published by . This book was released on 1996 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1998 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biomechanical Evaluation of a Lumbar Interspinous Spacer written by Avanthi Chikka and published by . This book was released on 2011 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lumbar interspinous spacers have recently become popular as an alternative treatment for low back pain. These devices are primarily used to treat spinal stenosis and facet arthritis and are intended to unload the facet joints, restore foraminal height and provide stability mainly in extension while allowing normal range of motion in other loading modes at the index level and also at the adjacent segments. The goals of this study were three fold: (i) to evaluate the biomechanical stability provided by the Superion Interspinous Spacer (ISS) (Vertiflex®, San Clemente, CA) implanted in the lumbar spine; (ii) to study the effect of transection of supraspinous ligament (SSL) on the lumbar spine implanted with ISS; and (iii) to investigate the effect of graded facetectomies (50%, 75%, 100% facetectomies for both unilateral and bilateral cases) following the placement of ISS in the lumbar spine. This study is basically divided into two parts: an in vitro investigation and finite element analysis. The in vitro biomechanical study was conducted on six human lumbar motion segments (3 L2-L3 and 3 L4-L5) in the following test sequence: (i) intact, (ii) implanted (SSL intact), (iii) SSL dilated longitudinally at the center (with ISS), (iv) 50% resection of SSL (with ISS), (v) 100% resection of SSL (with ISS) (vi) injured (ISS removed). A finite element (FE) analysis was performed for the same test cases and also to investigate the effect of graded facetectomies using an experimentally validated 3D L3-S1 model. A bending moment of 10 Nm was applied in all loading modes (flexion-extension, right/left lateral bending, and right/left axial rotation) while a bending moment of 10 Nm with 400N compressive follower load was applied only in flexion-extension. Range of motion (ROM) was recorded for each of the test constructs. In addition to ROM, intradiscal pressure (IDP), facet loads and stress contour plots for these test constructs were obtained from the FE model. Repeated measures one way ANOVA was used to perform statistical analysis to determine the statistically significant differences between different test constructs for the in vitro data. The in vitro results showed that the mean ROM was significantly (p0.05) reduced in extension post-implantation. There was a minimal decrease in mean ROM in flexion as well, but it was not significant (p0.05). ROM in lateral bending and axial rotation were not affected. Also, there was no significant difference in ROM in any of the loading modes for the instrumented cases with and without SSL. The FE results were in agreement with the in vitro results except in flexion. Unlike the in vitro results, the flexion ROM increased slightly with progressive transection of SSL. From the FE data, it was observed that there was a significant reduction in IDP and facet loads in extension following the placement of ISS. However, there was no considerable difference in IDP and facet loads for the implanted cases with partial or complete transection of SSL. ROM, IDP and facet loads were not affected at the adjacent levels in any of the loading modes for any of the test constructs. It was also observed that there was an effect of graded facetectomies (50%, 75% and 100%) on the instrumented spine with a significant increase in ROM in flexion in case of both unilateral and bilateral facetectomies. The ISS provided an increased stability in extension while preserving motion comparable to intact in the other loading modes. Also, it can be inferred that SSL plays an insignificant role in segmental stability in extension, lateral bending and axial rotation and has nominal effect in flexion. In addition, the results suggest that ISS may not be used in combination with graded facetectomies for both unilateral and bilateral cases.
Download or read book Mechanical Properties of Human Lumbar Spine Motion Segments Influences of Age Sex Disc Level and Degeneration written by A. L. Nachemson and published by . This book was released on 1979 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biomechanical Implications of Lumbar Spinal Ligament Transection written by Gregory A. Von Forell and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this work was to determine the possible effects of isolated spinal ligament transection on the biomechanics of the lumbar spine. A finite element model of a lumbar spine was developed and validated against experimental data. The model was tested in the primary modes of spinal motion in the intact condition, followed by comparative analysis of isolated removal of each spinal ligament. Results showed that stress increased in the remaining ligaments once a ligament was removed, potentially leading to ligament damage. Results also showed changes in bone remodeling "stimulus" which could lead to changes in bone density. Isolated ligament transection had little effect on intervertebral disc pressures. All major biomechanical changes occurred at the same spinal level as the transected ligament, with minor changes at adjacent levels. The results of this work demonstrate that iatrogenic damage of spinal ligaments disturbs the load sharing within spinal-ligament complex and may induce significant clinical changes in the spinal motion segment.
Download or read book Spinal Disorders in Growth and Aging written by Hideaki E. Takahashi and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the papers presented at the International Symposium on Spine and Spinal Disorders in Growth and Aging held in Niigata on November 22-23, 1992. The symposium commemorates the 75th anniversary of the foundation of the Department of Orthopedic Surgery, Niigata University School of Medicine. . The purpose of the symposium was to investigate the field of spine and spinal disorders in growth and aging. Topics ranged from osteoporosis, other of the spinal column to degenerative metabolic bone diseases, and deformity spinal disorders and heterotopic ossification with resultant myelopathy. Spinal manifestations of systemic and local diseases were also included. Symptoms of spinal disorders in both the lower and upper extremity were presented and biomechanics and bone mineral measurement of the spine were also discussed. The organizing committee would like to thank the following for their sponsorship and support of this international symposium: Japan Osteoporosis Foundation, Japan-North America Medical Exchange Foundation, Japan Russia Medical Exchange Foundation, Niigata Prefectural Government, and Niigata City Government. We deeply appreciate their support and contributions to the success of the symposium. The chairman of the organizing committee is most grateful for the contributions and support of the International Advisory Committee, Dr. B.D. Burr (USA), Dr. H.M. Frost (USA), and Dr. R.R. Recker (USA); the Local Advisory Committee, Dr. S. Kono (Prof. Emeritus of Niigata University) and Dr. T. Tajima (Prof. Emeritus ofNiigata University); and the members of the organizing committee, Dr. Y. Watanabe (Yamagata University), Dr. K.
Download or read book A Nonlinear Finite Element Study of a Lumbar Intervertebral Motion Segment microform written by Fan Chang and published by National Library of Canada. This book was released on 1987 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of a Viscoelastic Finite Element Model of L2 L3 Motion Segment written by Jaw-Lin Wang and published by . This book was released on 1996 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biomaterials for Spinal Surgery written by Luigi Ambrosio and published by Elsevier. This book was released on 2012-03-12 with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt: There have been important developments in materials and therapies for the treatment of spinal conditions. Biomaterials for spinal surgery summarises this research and how it is being applied for the benefit of patients.After an introduction to the subject, part one reviews fundamental issues such as spinal conditions and their pathologies, spinal loads, modelling and osteobiologic agents in spinal surgery. Part two discusses the use of bone substitutes and artificial intervertebral discs whilst part three covers topics such as the use of injectable biomaterials like calcium phosphate for vertebroplasty and kyphoplasty as well as scoliosis implants. The final part of the book summarises developments in regenerative therapies such as the use of stem cells for intervertebral disc regeneration.With its distinguished editors and international team of contributors, Biomaterials for spinal surgery is a standard reference for both those developing new biomaterials and therapies for spinal surgery and those using them in clinical practice. - Summarises recent developments in materials and therapies for the treatment of spinal conditions and examines how it is being applied for the benefit of patients - Reviews fundamental issues such as spinal conditions and their pathologies, spinal loads, modelling and osteobiologic agents in spinal surgery - Discusses the use of bone substitutes and artificial intervertebral discs and covers topics such as the use of injectable biomaterials like calcium phosphate for vertebroplasty and kyphoplasty
Download or read book Effect of Graded Facetectomy on the Stiffness of a Lumbar Motion Segment written by Sudheer Paruchuri and published by . This book was released on 1998 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Stability of a Lumbar Motion Segment Using Finite Element Method written by Kim Kheng Lee and published by . This book was released on 2004 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
