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Cervical spine biomechanics

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https://www.readbyqxmd.com/read/27902850/biomechanical-comparison-of-2-veterinary-locking-plates-to-monocortical-screw-polymethylmethacrylate-fixation-in-canine-cadaveric-cervical-vertebral-column
#1
Bianca F Hettlich, Geoffrey T Fosgate, Alan S Litsky
OBJECTIVE: To compare the biomechanical properties of 2 veterinary locking plates and monocortical screws/polymethylmethacrylate (PMMA) fixation in canine cadaveric cervical vertebral columns. STUDY DESIGN: Biomechanical cadaveric study. MATERIALS: Nineteen cervical vertebral columns (C2-C7) from large breed, skeletally mature, canine cadavers were used. A cortical ring was placed as a disk spacer at C4-C5 in all specimens. Seven vertebral columns were plated at C4-C5 with two 4-hole, 3...
November 30, 2016: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/27886885/classification-and-management-of-pediatric-subaxial-cervical-spine-injuries
#2
REVIEW
Casey J Madura, James M Johnston
Appropriate management of subaxial spine injury in children requires an appreciation for the differences in anatomy, biomechanics, injury patterns, and treatment options compared with adult patients. Increased flexibility, weak neck muscles, and cranial disproportion predispose younger children to upper cervical injuries and spinal cord injury without radiographic abnormality. A majority of subaxial cervical spine injuries can be treated nonoperatively. Surgical instrumentation options for children have significantly increased in recent years...
January 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/27886874/treatment-of-facet-injuries-in-the-cervical-spine
#3
REVIEW
Navid Khezri, Tamir Ailon, Brian K Kwon
Facet injuries are common in the cervical spine. Many classification systems over the years have characterized the heterogeneity of these injuries. For unilateral facet fractures with minimal displacement and no neurological deficit, there is mounting evidence that better radiographic and clinical outcomes may be achieved with surgical treatment. Anterior and posterior approaches can both be utilized successfully for the surgical management of facet injuries. The anterior approach is well tolerated, allows one to address a disc herniation, and provides a high union rate with good sagittal alignment...
January 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/27835042/cervical-injury-assessments-for-concussion-evaluation-a-review
#4
Kelly Cheever, Keisuke Kawata, Ryan Tierney, Anne Galgon
BACKGROUND:   A concussion is a complex pathophysiologic process that is induced by biomechanical forces and affects the brain. Cervical injuries and concussion can share similar mechanisms and nearly identical symptoms or causes. Therefore, symptoms or causes alone may be insufficient to differentiate between patients with a concussion and patients with cervical injuries. OBJECTIVE:   To demonstrate the homogeneous causes and symptoms observed in patients with a concussion and patients with cervical injury and to provide information on clinical tests that can differentiate cervical injury from pathologic conditions of vestibular or central origin...
November 1, 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27830891/morphometric-multislice-computed-tomography-examination-of-the-craniovertebral-junction-in-neck-flexion-and-extension
#5
Slobodan Marinkovic, Ivan Milić, Igor Djorić, Luciano Brigante, Aleksandar Miljatović, Laslo Puškaš, Slobodan Kapor, Jelena Boljanović
BACKGROUND: Detailed study of the craniovertebral junction (CVJ) is necessary to completely understand the mechanism of its flexion and extension. MATERIALS AND METHODS: One cadaver head was sectioned in the sagittal plane. Also, in 22 volunteers, examined using the multislice computerized tomography (MSCT), 14 parameters and 2 angles were measured in the neutral position, flexion and extension. RESULTS: The obtained measurements showed the anterior part of the occiput to move inferiorly in flexion, and the anterior atlas arch and the tip of the dens to get closer to the basion...
November 10, 2016: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/27807639/the-fascicular-anatomy-and-peak-force-capabilities-of-the-sternocleidomastoid-muscle
#6
Ewan Kennedy, Michael Albert, Helen Nicholson
PURPOSE: The fascicular morphology of the sternocleidomastoid (SCM) is not well described in modern anatomical texts, and the biomechanical forces it exerts on individual cervical motion segments are not known. The purpose of this study is to investigate the fascicular anatomy and peak force capabilities of the SCM combining traditional dissection and modern imaging. METHODS: This study is comprised of three parts: Dissection, magnetic resonance imaging (MRI) and biomechanical modelling...
November 2, 2016: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/27787486/minimally-invasive-cervical-spine-surgery
#7
Branko Skovrlj, Sheeraz A Qureshi
AIM: Degenerative disorders of the cervical spine requiring surgical intervention have become increasingly more common over the past decade. Traditionally, open surgical approaches have been the mainstay of surgical treatment. More commonly, minimally invasive techniques are being developed with the intent to decrease surgical morbidity and iatrogenic spinal instability. This study will review four minimally invasive cervical techniques that have been increasingly utilized in the treatment of degenerative cervical spine disease...
October 27, 2016: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/27781187/kinematic-magnetic-resonance-imaging-assessment-of-the-degenerative-cervical-spine-changes-after-anterior-decompression-and-cage-fusion
#8
Marina Obradov, Menno R Bénard, Michiel M A Janssen, Patricia G Anderson, Petra J C Heesterbeek, Maarten Spruit
Study Design A prospective cohort study. Objective Decompression and fusion of cervical vertebrae is a combined procedure that has a high success rate in relieving radicular symptoms and stabilizing or improving cervical myelopathy. However, fusion may lead to increased motion of the adjacent vertebrae and cervical deformity. Both have been postulated to lead to adjacent segment pathology (ASP). Kinematic magnetic resonance imaging (MRI) has been increasingly used to evaluate range of motion (ROM) of the cervical spine and ASP...
November 2016: Global Spine Journal
https://www.readbyqxmd.com/read/27706424/surgical-treatment-of-traumatic-cervical-facet-dislocation-anterior-posterior-or-combined-approaches
#9
Catarina C Lins, Diego T Prado, Andrei F Joaquim
Surgical treatment is well accepted for patients with traumatic cervical facet joint dislocations (CFD), but there is uncertainty over which approach is better: anterior, posterior or combined. We performed a systematic literature review to evaluate the indications for anterior and posterior approaches in the management of CFD. Anterior approaches can restore cervical lordosis, and cause less postoperative pain and less wound problems. Posterior approaches are useful for direct reduction of locked facet joints and provide stronger fixation from a biomechanical point of view...
September 2016: Arquivos de Neuro-psiquiatria
https://www.readbyqxmd.com/read/27690838/whiplash-associated-disorders-occupant-kinematics-and-neck-morphology
#10
Brian D Stemper, Brian D Corner
Synopsis Despite considerable research effort, the incidence of whiplash injury during automotive collisions has continued to rise. This is due, at least in part, to a limited recognition of biomechanical injury mechanisms and factors influencing injury risk. While automotive safety modifications reduced injury risk in some cases, impact on the overall whiplash incidence was limited. This is likely attributable to significant occupant-related differences that have a profound impact on injury risk. Many of those differences were outlined in research studies, and examples include female sex and the associated sex-based anthropometrical variation that can affect seating orientation; cervical spinal posture; and anatomical attributes, including cervical column slenderness and neck muscle morphometry...
October 2016: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/27650073/pediatric-cervical-spine-in-emergency-radiographic-features-of-normal-anatomy-variants-and-pitfalls
#11
Omar Adib, Emeline Berthier, Didier Loisel, Christophe Aubé
Injuries of the cervical spine are uncommon in children. The distribution of injuries, when they do occur, differs according to age. Young children aged less than 8 years usually have upper cervical injuries because of the anatomic and biomechanical properties of their immature spine, whereas older children, whose biomechanics more closely resemble those of adults, are prone to lower cervical injuries. In all cases, the pediatric cervical spine has distinct radiographic features, making the emergency radiological analysis of it difficult...
September 20, 2016: Skeletal Radiology
https://www.readbyqxmd.com/read/27642820/adjacent-segment-disease-in-the-cervical-and-lumbar-spine
#12
Daniel G Tobert, Valentin Antoci, Shaun P Patel, Ehsan Saadat, Christopher M Bono
Adjacent segment disease (ASD) is disappointing long-term outcome for both the patient and clinician. In contrast to adjacent segment degeneration, which is a common radiographic finding, ASD is less common. The incidence of ASD in both the cervical and lumbar spine is between 2% and 4% per year, and ASD is a significant contributor to reoperation rates after spinal arthrodesis. The etiology of ASD is multifactorial, stemming from existing spondylosis at adjacent levels, predisposed risk to degenerative changes, and altered biomechanical forces near a previous fusion site...
September 16, 2016: Clinical Spine Surgery
https://www.readbyqxmd.com/read/27635354/effect-of-pillow-height-on-the-biomechanics-of-the-head-neck-complex-investigation-of-the-cranio-cervical-pressure-and-cervical-spine-alignment
#13
Sicong Ren, Duo Wai-Chi Wong, Hui Yang, Yan Zhou, Jin Lin, Ming Zhang
BACKGROUND: While appropriate pillow height is crucial to maintaining the quality of sleep and overall health, there are no universal, evidence-based guidelines for pillow design or selection. We aimed to evaluate the effect of pillow height on cranio-cervical pressure and cervical spine alignment. METHODS: Ten healthy subjects (five males) aged 26 ± 3.6 years were recruited. The average height, weight, and neck length were 167 ± 9.3 cm, 59.6 ± 11.9 kg, and 12...
2016: PeerJ
https://www.readbyqxmd.com/read/27601934/biomechanical-evaluation-of-dtrax-%C3%A2-posterior-cervical-cage-stabilization-with-and-without-lateral-mass-fixation
#14
Leonard I Voronov, Krzysztof B Siemionow, Robert M Havey, Gerard Carandang, Avinash G Patwardhan
INTRODUCTION: Lateral mass screw (LMS) fixation with plates or rods is the current standard procedure for posterior cervical fusion. Recently, implants placed between the facet joints have become available as an alternative to LMS or transfacet screws for patients with cervical spondylotic radiculopathy. The purpose of this study was to evaluate the biomechanical stability of the DTRAX(®) cervical cage for single- and two-level fusion and compare this to the stability achieved with LMS fixation with rods in a two-level construct...
2016: Medical Devices: Evidence and Research
https://www.readbyqxmd.com/read/27598029/evaluation-of-three-human-cervical-fusion-implants-for-use-in-the-canine-cervical-vertebral-column
#15
Emily J Morrison, Alan S Litsky, Matthew J Allen, Geoffrey T Fosgate, Bianca F Hettlich
OBJECTIVE: To assess technical feasibility and mechanical properties of 3 locking plate designs (Zero-P, Zero-P VA, and Uniplate 2) for use in the canine cervical spine. STUDY DESIGN: Prospective ex vivo study. ANIMALS: Cadaver cervical spines from skeletally mature large breed dogs (n = 18). METHODS: Specimens were screened using radiography and allocated into balanced groups based on bone density. Stiffness of intact C4-C5 vertebral motion units was measured in extension, flexion, and lateral bending using nondestructive 4-point bend testing...
October 2016: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/27594659/mechanisms-and-mitigation-of-head-and-spinal-injuries-due-to-motor-vehicle-crashes
#16
Paul C Ivancic
Synopsis Head and spinal injuries commonly occur during motor vehicle crashes (MVCs). The goal of this clinical commentary is to discuss real-life versus simulated MVCs and to present clinical, biomechanical, and epidemiological evidence of MVC-related injury mechanisms. It will also address how this knowledge may guide and inform the design of injury mitigation devices and assist in clinical decision making. Evidence indicates that there exists no universal injury tolerance applicable to the entire population of the occupants of MVCs...
October 2016: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/27471414/bilateral-posterior-cervical-cages-provide-biomechanical-stability-assessment-of-stand-alone-and-supplemental-fixation-for-anterior-cervical-discectomy-and-fusion
#17
Leonard I Voronov, Krzysztof B Siemionow, Robert M Havey, Gerard Carandang, Frank M Phillips, Avinash G Patwardhan
INTRODUCTION: Supplemental posterior instrumentation has been widely used to enhance stability and improve fusion rates in higher risk patients undergoing anterior cervical discectomy and fusion (ACDF). These typically involve posterior lateral mass or pedicle screw fixation with significant inherent risks and morbidities. More recently, cervical cages placed bilaterally between the facet joints (posterior cervical cages) have been used as a less disruptive alternative for posterior fixation...
2016: Medical Devices: Evidence and Research
https://www.readbyqxmd.com/read/27457429/resection-or-degeneration-of-uncovertebral-joints-altered-the-segmental-kinematics-and-load-sharing-pattern-of-subaxial-cervical-spine-a-biomechanical-investigation-using-a-c2-t1-finite-element-model
#18
Zhong Wang, Hui Zhao, Ji-Ming Liu, Li-Wen Tan, Peng Liu, Jian-Hua Zhao
The uncovertebral joint (UJ) is an important load-bearing structure in the subaxial cervical spine (SCS) and the medial wall of the intervertebral foramen (IVF). To investigate the UJ׳s role in load distribution and transmission under physiological loading, we developed and validated a detailed finite element model (C2-T1). Based on the initial model, two additional models were modified to simulate surgical resection and degeneration of UJs, to evaluate their influence on SCS kinematics and load distribution...
September 6, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27427164/three-dimensional-imaging-of-high-resolution-computer-tomography-of-singers-larynges-a-pilot-study
#19
Alexandra Vorik, Fabian Unteregger, Salome Zwicky, Julia Schiwowa, Silke Potthast, Claudio Storck
OBJECTIVES/HYPOTHESIS: Biplanar imaging technique is not sufficient for an exact visualization and evaluation of the laryngeal biomechanics during speaking or singing. The aim of this pilot study was to test a 3D-visualization software MIMICS (Materialize Interactive Medical Image Control System, Materialize, Leuven, Belgium) for visualizing laryngeal cartilages and resonance space of living humans during singing based on high-resolution computed tomography (HRCT) and analyzing the biomechanics thereof...
July 11, 2016: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/27382760/-recent-advances-of-biomechanical-studies-on-cervical-fusion-and-non-fusion-surgery
#20
REVIEW
Zhenhua Liao, Weiqiang Liu
This article reviews the progress of biomechanical studies on anterior cervical fusion and non-fusion surgery in recent years. The similarities and differences between animal and human cervical spines as well as the major three biomechanical test methods are introduced. Major progresses of biomechanical evaluation in anterior cervical fusion and non-fusion devices, hybrid surgery, coupled motion and biomechanical parameters, such as the instant center of rotation, are classified and summarized. Future development of loading method, multilevel hybrid surgery and coupling character are also discussed...
February 2016: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
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