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Spinal biomechanics

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https://www.readbyqxmd.com/read/28097935/finite-element-simulations-of-the-head-brain-responses-to-the-top-impacts-of-a-construction-helmet-effects-of-the-neck-and-body-mass
#1
John Z Wu, Christopher S Pan, Bryan M Wimer, Charles L Rosen
Traumatic brain injuries are among the most common severely disabling injuries in the United States. Construction helmets are considered essential personal protective equipment for reducing traumatic brain injury risks at work sites. In this study, we proposed a practical finite element modeling approach that would be suitable for engineers to optimize construction helmet design. The finite element model includes all essential anatomical structures of a human head (i.e. skin, scalp, skull, cerebrospinal fluid, brain, medulla, spinal cord, cervical vertebrae, and discs) and all major engineering components of a construction helmet (i...
January 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28097243/range-of-motion-sacral-screw-and-rod-strain-in-long-posterior-spinal-constructs-a-biomechanical-comparison-between-s2-alar-iliac-screws-with-traditional-fixation-strategies
#2
Chester E Sutterlin, Antony Field, Lisa A Ferrara, Andrew L Freeman, Kevin Phan
BACKGROUND: S1 screw failure and L5/S1 non-union are issues with long fusions to S1. Improved construct stiffness and S1 screw offloading can help avoid this. S2AI screws have shown to provide similar stiffness to iliac screws when added to L3-S1 constructs. We sought to examine and compare the biomechanical effects on an L2-S1 pedicle screw construct of adding S2AI screws, AxiaLIF, L5-S1 interbody support via transforaminal lumbar interbody fusion (TLIF), and to examine the effect of the addition of cross connectors to each of these constructs...
December 2016: Journal of Spine Surgery (Hong Kong)
https://www.readbyqxmd.com/read/28092739/an-emg-driven-biomechanical-model-of-the-canine-cervical-spine
#3
M Alizadeh, G G Knapik, J S Dufour, C Zindl, M J Allen, J Bertran, N Fitzpatrick, W S Marras
Due to the frequency of cervical spine injuries in canines, the purpose of this effort was to develop an EMG-driven dynamic model of the canine cervical spine to assess a biomechanical understanding that enables one to investigate the risk of neck disorders. A canine subject was recruited in this investigation in order to collect subject specific data. Reflective markers and a motion capture system were used for kinematic measurement; surface electrodes were used to record electromyography signals, and with the aid of force plate kinetics were recorded...
December 26, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28089422/low-magnitude-mechanical-signals-and-the-spine-a-review-of-current-and-future-applications
#4
REVIEW
Martin H Pham, Zorica Buser, Jeffrey C Wang, Frank L Acosta
Animal and human studies demonstrate the anabolic properties of low-magnitude mechanical stimulation (LMMS) in its ability to improve bone formation by enhancing the proliferation of mesenchymal stem cells and their subsequent commitment down an osteoblastic lineage. Response to mechanical strains as low as 10μɛ have been seen, illustrating the sensitivity of mechanosensory cells to mechanotransduction pathways. Applications to the spine include treatment of osteoporosis in preparation for instrumented fusion, fracture reduction in spinal cord injury patients to slow bone mineral density loss, and bone tissue engineering and enhancement of bone-implant osseointegration for pseudarthrosis and hardware failure...
January 12, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28078075/a-design-method-for-fes-bone-health-therapy-in-sci
#5
Brian Andrews, James Shippen, Monica Armengol, Robin Gibbons, William Holderbaum, William Harwin
FES assisted activities such as standing, walking, cycling and rowing induce forces within the leg bones and have been proposed to reduce osteoporosis in spinal cord injury (SCI). However, details of the applied mechanical stimulus for osteogenesis is often not reported. Typically, comparisons of bone density results are made after costly and time consuming clinical trials. These studies have produced inconsistent results and are subject to sample size variations. Here we propose a design process that may be used to predict the clinical outcome based on biomechanical simulation and mechano-biology...
September 15, 2016: European Journal of Translational Myology
https://www.readbyqxmd.com/read/28056123/the-interface-of-mechanics-and-nociception-in-joint-pathophysiology-insights-from-the-facet-temporomandibular-joints
#6
Megan M Sperry, Meagan E Ita, Sonia Kartha, Sijia Zhang, Ya-Hsin Yu, Beth Winkelstein
Chronic joint pain is a widespread problem that frequently occurs with aging and trauma. Pain occurs most often in synovial joints, the body's load bearing joints. The mechanical and molecular mechanisms contributing to synovial joint pain are reviewed using two examples, the cervical spinal facet joints and temporomandibular joint. Although much work has focused on the macroscale mechanics of joints in health and disease, the combined influence of tissue mechanics, molecular processes, and nociception in joint pain has only recently become a focus...
January 5, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28038688/biomechanical-evaluation-of-a-growth-friendly-rod-construct
#7
Sarah Galvis, Josh Arnold, Erin Mannen, Benjamin Wong, Hadley Sis, Eileen Cadel, John Anderson, Dennis Anderson, Paul Arnold, Elizabeth Friis
BACKGROUND: Distraction-type rods mechanically stabilize the thorax and improve lung growth and function by applying distraction forces at the rib, spine, pelvis, or a combination of locations. However, the amount of stability the rods provide and the amount the thorax needs is unknown. METHODS: Five freshly frozen and thawed cadaveric thoracic spine specimens were tested for lateral bending, flexion/extension, and axial rotation in displacement control (1°/sec) to a load limit of ±5 Nm for five cycles after which a growth-friendly unilateral rod was placed in a simulated rib-to-lumbar attachment along the right side...
January 2017: Spine Deformity
https://www.readbyqxmd.com/read/28032697/patient-specific-orthopaedic-implants
#8
REVIEW
Jack M Haglin, Adam E M Eltorai, Joseph A Gil, Stephen E Marcaccio, Juliana Botero-Hincapie, Alan H Daniels
Patient-specific orthopaedic implants are emerging as a clinically promising treatment option for a growing number of conditions to better match an individual's anatomy. Patient-specific implant (PSI) technology aims to reduce overall procedural costs, minimize surgical time, and maximize patient outcomes by achieving better biomechanical implant fit. With this commercially-available technology, computed tomography or magnetic resonance images can be used in conjunction with specialized computer programs to create preoperative patient-specific surgical plans and to develop custom cutting guides from 3-D reconstructed images of patient anatomy...
November 2016: Orthopaedic Surgery
https://www.readbyqxmd.com/read/28026727/radiological-changes-after-interspinous-dynamic-stabilisation-for-lateral-stenosis-of-lumbar-spinal-canal-a-parallel-group-randomised-trial
#9
J Mohar, M Cimerman
PURPOSE OF THE STUDY Interspinous dynamic stabilisation devices (IDSDs) are used for stabilisation and indirect decompression of the spinal motion segment in minimally invasive treatment of degenerative conditions of lumbar spine. Good methodological quality studies on biomechanical effects of IDSDs are lacking in scientific literature. The purpose of this study was to evaluate the biomechanical effect of dynamic IDSD implantation on a spinal motion segment. MATERIAL AND METHODS We conducted a parallel group randomised trial (RT) on twelve patients, comparing radiological stabilisation and indirect decompression outcome measures between groups of patients with an isolated degenerative condition of L4-L5 motion segment and unilateral L5 nerve root radiculopathy...
2016: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28010945/impact-of-material-and-morphological-parameters-on-the-mechanical-response-of-the-lumbar-spine-a-finite-element-sensitivity-study
#10
Thomas Zander, Marcel Dreischarf, Anne-Katrin Timm, Wolfgang W Baumann, Hendrik Schmidt
Finite element models are frequently used to study lumbar spinal biomechanics. Deterministic models are used to reflect a certain configuration, including the means of geometrical and material properties, while probabilistic models account for the inherent variability in the population. Because model parameters are generally uncertain, their predictive power is frequently questioned. In the present study, we determined the sensitivities of spinal forces and motions to material parameters of intervertebral discs, vertebrae, and ligaments and to lumbar morphology...
December 16, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28005935/a-biomechanical-stability-study-of-extraforaminal-lumbar-interbody-fusion-on-the-cadaveric-lumbar-spine-specimens
#11
Song Guo, Cheng Zeng, Meijun Yan, Yingchao Han, Dongdong Xia, Guixin Sun, Lijun Li, Mingjie Yang, Jun Tan
BACKGROUND: Transforaminal lumbar interbody fusion (TLIF) is an effective surgery for lumbar degenerative disease. However, this fusion technique requires resection of inferior facet joint to provide access for superior facet joint resection, which results in reduced lumbar spinal stability and unnecessary trauma. We have previously developed extraforaminal lumbar interbody fusion (ELIF) that can avoid back muscle injury with direct nerve root decompression. This study aims to show that ELIF enhances lumbar spinal stability in comparison to TLIF by comparing lumbar spinal stability of L4-L5 range of motion (ROM) on 12 cadaveric spine specimens after performing TLIF or ELIF...
2016: PloS One
https://www.readbyqxmd.com/read/27994773/biomechanical-analysis-of-a-pedicle-screw-rod-system-with-a-novel-cross-link-configuration
#12
Yasuhiro Nakajima, Masahito Hara, Daisuke Umebayashi, Shoichi Haimoto, Yu Yamamoto, Yusuke Nishimura, Toshihiko Wakabayashi
STUDY DESIGN: The strength effects of a pedicle screw-rod system supplemented with a novel cross-link configuration were biomechanically evaluated in porcine spines. PURPOSE: To assess the biomechanical differences between a conventional cross-link pedicle screw-rod system versus a novel cross-link instrumentation, and to determine the effect of the cross-links. OVERVIEW OF LITERATURE: Transverse cross-link systems affect torsional rigidity, but are thought to have little impact on the sagittal motion of spinal constructs...
December 2016: Asian Spine Journal
https://www.readbyqxmd.com/read/27990418/finite-element-study-of-a-lumbar-intervertebral-disc-nucleus-replacement-device
#13
Jessica S Coogan, W Loren Francis, Travis D Eliason, Todd L Bredbenner, Brian D Stemper, Narayan Yoganandan, Frank A Pintar, Daniel P Nicolella
Nucleus replacement technologies are a minimally invasive alternative to spinal fusion and total disc replacement that have the potential to reduce pain and restore motion for patients with degenerative disc disease. Finite element modeling can be used to determine the biomechanics associated with nucleus replacement technologies. The current study focuses on a new nucleus replacement device designed as a conforming silicone implant with an internal void. A validated finite element model of the human lumbar L3-L4 motion segment was developed and used to investigate the influence of the nucleus replacement device on spine biomechanics...
2016: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/27986604/cell-therapy-for-the-degenerating-intervertebral-disc
#14
REVIEW
Wei Tong, Zhouyu Lu, Ling Qin, Robert L Mauck, Harvey E Smith, Lachlan J Smith, Neil R Malhotra, Martin F Heyworth, Franklin Caldera, Motomi Enomoto-Iwamoto, Yejia Zhang
Spinal conditions related to intervertebral disc (IVD) degeneration cost billions of dollars in the US annually. Despite the prevalence and soaring cost, there is no specific treatment that restores the physiological function of the diseased IVD. Thus, it is vital to develop new treatment strategies to repair the degenerating IVD. Persons with IVD degeneration without back pain or radicular leg pain often do not require any intervention. Only patients with severe back pain related to the IVD degeneration or biomechanical instability are likely candidates for cell therapy...
November 28, 2016: Translational Research: the Journal of Laboratory and Clinical Medicine
https://www.readbyqxmd.com/read/27938365/comparing-the-effects-of-different-dynamic-sitting-strategies-in-wheelchair-seating-on-lumbar-pelvic-angle
#15
Chun-Ting Li, Yao-Te Peng, Yen-Ting Tseng, Yen-Nien Chen, Kuen-Horng Tsai
BACKGROUND: Prolonged static sitting in a wheelchair is associated with an increased risk of lower back pain. The wheelchair seating system is a key factor of this risk because it affects spinal loading in the sitting position. In this study, 7 dynamic sitting strategies (DSSs) are examined: lumbar prominent dynamic sitting (LPDS), back reclined dynamic sitting (BRDS), femur upward dynamic sitting (FUDS), lumbar prominent with back reclined dynamic sitting (LBDS), lumbar prominent with femur upward dynamic sitting (LFDS), back reclined with femur upward dynamic sitting (BFDS), and lumbar prominent with back reclined with femur upward dynamic sitting (LBFDS)...
December 9, 2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27935559/application-of-a-model-to-analyze-shoulder-biomechanics-in-adult-patients-with-spinal-cord-injury-when-walking-with-crutches-in-two-different-gait-patterns
#16
Enrique Perez-Rizo, Fernando Trincado-Alonso, Soraya Pérez-Nombela, Antonio Del Ama-Espinosa, Fernando Jiménez-Díaz, Vicente Lozano-Berrio, Angel Gil-Agudo
BACKGROUND: Specific biomechanical models have been developed to study gait using crutches. Clinical application of these models is needed in adult spinal cord injury (SCI) population walking with different patterns of gait with crutches to prevent overuse shoulder injuries. OBJECTIVE: To apply a biomechanical model in a clinical environment to analyze shoulder in adult SCI patients walking with two different patterns of gait with crutches: two point reciprocal gait (RG) and swing-through gait (SG)...
December 8, 2016: NeuroRehabilitation
https://www.readbyqxmd.com/read/27935447/lateral-mass-screw-stimulation-thresholds-in-posterior-cervical-instrumentation-surgery-a-predictor-of-medial-deviation
#17
Bayard Wilson, Erik Curtis, Brian Hirshman, Ahmet Oygar, Karen Chen, Brandon C Gabel, Florin Vaida, David W Allison, Joseph D Ciacci
OBJECTIVE Normative data exists for stimulus-evoked pedicle screw electromyography (EMG) current thresholds in the lumbar spine, and is routinely referenced during spine surgeries to detect a screw breach, prevent injury of neural elements, and ensure the most biomechanically sound instrumentation construct. To date, similar normative data for cervical lateral mass screws is limited, thus the utility of lateral mass screw testing remains unclear. To address this disparity, in this study the authors describe cumulative lateral mass screw stimulation threshold data in patients undergoing posterior cervical instrumentation with lateral mass screws...
December 9, 2016: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/27927507/sacral-alar-iliac-fixation-in-pediatric-deformity-radiographic-outcomes-and-complications
#18
Amit Jain, Khaled M Kebaish, Paul D Sponseller
STUDY DESIGN: Retrospective case series. OBJECTIVES: To assess the radiographic outcomes and complications of sacral-alar-iliac (SAI) fixation in children. SUMMARY OF BACKGROUND DATA: Pelvic fixation in children undergoing spinal deformity surgery can be challenging because of complex anatomy, compound biomechanical forces at the lumbosacral junction, and poor bone quality. METHODS: Radiographic and clinical records of 80 consecutive patients aged 18 years or younger who underwent posterior spinal fusion surgery with SAI fixation by one pediatric orthopedic surgeon and who had a minimum 2 years of follow-up (mean follow-up: 3...
May 2016: Spine Deformity
https://www.readbyqxmd.com/read/27918892/the-effects-of-muscle-weakness-on-degenerative-spondylolisthesis-a-finite-element-study
#19
Rui Zhu, Wen-Xin Niu, Zhi-Li Zeng, Jian-Hua Tong, Zhi-Wei Zhen, Shuang Zhou, Yan Yu, Li-Ming Cheng
BACKGROUND: Whether muscle weakness is a cause, or result, of degenerative spondylolisthesis is not currently well understood. Little biomechanical evidence is available to offer an explanation for the mechanism behind exercise therapy. Therefore, the aim of this study is to investigate the effects of back muscle weakness on degenerative spondylolisthesis and to tease out the biomechanical mechanism of exercise therapy. METHODS: A nonlinear 3-D finite element model of L3-L5 was constructed...
November 26, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27918675/biomechanics-in-paralympics-implications-for-performance
#20
Floor Morriën, Matthew J D Taylor, Florentina J Hettinga
PURPOSE: To provide an overview of biomechanical studies in Paralympic research and their relevance for performance in Paralympic sports. METHODS: Search terms ' Paralympic Biomechanics', 'Paralympic Sport Performance', 'Paralympic Athlete Performance', and Paralympic Athlete' were entered into the electronic database PubMed. RESULTS: Thirty-four studies were included. Biomechanical studies in Paralympics mainly contributed to performance enhancement by technical optimization (n=32) and/or injury prevention (n=6)...
December 5, 2016: International Journal of Sports Physiology and Performance
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