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Cervical axial rotation

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https://www.readbyqxmd.com/read/29202506/effect-of-facetectomy-on-the-three-dimensional-biomechanical-properties-of-the-fourth-canine-cervical-functional-spinal-unit-a-cadaveric-study
#1
Nadja Bösch, Martin Hofstetter, Alexander Bürki, Beatriz Vidondo, Fenella Davies, Franck Forterre
Objective To study the biomechanical effect of facetectomy in 10 large breed dogs (>24 kg body weight) on the fourth canine cervical functional spinal unit. Methods Canine cervical spines were freed from all muscles. Spines were mounted on a six-degrees-of-freedom spine testing machine for three-dimensional motion analysis. Data were recorded with an optoelectronic motion analysis system. The range of motion was determined in all three primary motions as well as range of motion of coupled motions on the intact specimen, after unilateral and after bilateral facetectomy...
November 2017: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/29177553/a-novel-posterior-approach-preserving-three-muscles-inserted-at-c2-in-multilevel-cervical-posterior-decompression-and-fusion-using-c2-pedicle-screws
#2
Kazunari Takeuchi, Toru Yokoyama, Takuya Numasawa, Taito Itabashi, Yoshihito Yamasaki, Hitoshi Kudo
PURPOSE: To present a novel posterior approach in multilevel cervical posterior decompression and fusion (PDF) using C2 pedicle screws that preserves the rectus capitis posterior major, oblique capitis inferior, and semispinalis cervicis. METHODS: We analyzed 30 consecutive patients who underwent C2-T1 PDF using an approach that preserved these three muscles without resecting. We assessed O-C2 range of motion (ROM), cross-sectional area of the cervical posterior muscles, rotational ROM, visual analog scale (VAS) for axial pain, neck disability index (NDI), and limitations of activities of daily living (ADL) involving neck movements...
November 24, 2017: European Spine Journal
https://www.readbyqxmd.com/read/29123446/ankylosing-spondylitis-and-balance
#3
REVIEW
Alper Uckun, Ilhan Sezer
Ankylosing spondylitis is a chronic inflammatory disease that mainly affects axial joints and the changes in the vertebrae cause typical kyphotic posture. In patients with ankylosing spondylitis, the postural changes, including cervical flexion, decreased lumbar lordosis, posterior rotation of pelvis, hip extension, knee flexion, and plantar flexion of ankle along with kyphosis, may occur in the upcoming terms of the disease and may negatively affect balance. Joint and eye involvements; muscular, vestibular and proprioceptional changes can also affect balance...
October 2017: Eurasian Journal of Medicine
https://www.readbyqxmd.com/read/29115190/cervical-injury-related-to-mandibular-fractures-a-retrospective-study-of-315-cases
#4
Tommaso Cutilli, Secondo Scarsella, Desiderio Di Fabio, Antonio Oliva, Maria Adelaide Continenza, Giacomo Sollecchia, Stefano Necozione, Sara Bernardi
Objective To define the association between mandibular fractures and alterations of the cranio-atlo-axial joint (CAAJ). Methods 315 cases of displaced mandibular fractures were retrospectively evaluated by CT scan and cervical X-ray for associated alterations of the CAAJ. Statistical analysis employed the chi-square and Cohen's kappa coefficient. Results Single fractures amounted to 69.84% and multiple fractures to 30.16% of total fractures. CT scans showed a rotation of the atlas on the same side of single fractures and subluxation of the CAAJ...
November 8, 2017: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/29074465/comparison-of-three-dimensional-helical-axes-of-the-cervical-spine-between-in-vitro-and-in-vivo-testing
#5
René Jonas, Robert Demmelmaier, Steffen P Hacker, Hans-Joachim Wilke
BACKGROUND CONTEXT: The range of motion is a well-accepted parameter for the assessment and evaluation of cervical motion. However, more qualitative data of the kinematics of the cervical spine is needed for the development and success of cervical disc arthroplasty [1]. PURPOSE: The aim of this study was to provide basic information about helical axes of human cervical spine under in vitro conditions. Furthermore it should clarify whether the three-dimensional helical axes of cervical motion gained from in vitro experiments are in agreement with those gained from in vivo experiments and therefore to prove its reliability...
October 23, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29043798/jozilebomines-a-and-b-naphthylisoquinoline-dimers-from-the-congolese-liana-ancistrocladus-ileboensis-with-antiausterity-activities-against-the-panc-1-human-pancreatic-cancer-cell-line
#6
Jun Li, Raina Seupel, Torsten Bruhn, Doris Feineis, Marcel Kaiser, Reto Brun, Virima Mudogo, Suresh Awale, Gerhard Bringmann
Two new naphthylisoquinoline dimers, jozilebomines A (1a) and B (1b), were isolated from the roots of the Congolese plant Ancistrocladus ileboensis, along with the known dimer jozimine A2 (2). These compounds are Dioncophyllaceae-type metabolites, i.e., lacking oxygen functions at C-6 and with an R-configuration at C-3 in their tetrahydroisoquinoline moieties. The dimers 1a and 1b consist of two 7,1'-coupled naphthylisoquinoline monomers linked through an unprecedented 3',6″-coupling in the binaphthalene core and not, as in 2, via the C-3-positions of the two naphthalene units...
October 27, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/29042769/bioabsorbable-self-retaining-pla-nano-sized-%C3%AE-tcp-cervical-spine-interbody-fusion-cage-in-goat-models-an-in-vivo-study
#7
Lu Cao, Qian Chen, Li-Bo Jiang, Xiao-Fan Yin, Chong Bian, Hui-Ren Wang, Yi-Qun Ma, Xiang-Qian Li, Xi-Lei Li, Jian Dong
STUDY DESIGN: This is an experimental animal study. OBJECTIVE: The objective of this study was to compare an anterior cervical discectomy and interbody fusion of a novel polylactide/nano-sized β-tricalcium phosphate (PLA/nβ-TCP) bioabsorbable self-retaining cervical fusion cage (BCFC) with an autologous bone graft and polyetheretherketone (PEEK) cages. BACKGROUND: Although PLA cervical cages have potential advantages compared with traditional materials, they are not currently routinely used in spine surgery because of undesirable effects such as the lack of osteoconductivity and osteolysis around the implant...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29019902/in-vitro-biomechanical-comparison-after-fixed-and-mobile-core-artificial-cervical-disc-replacement-versus-fusion
#8
COMPARATIVE STUDY
Jigang Lou, Yuanchao Li, Beiyu Wang, Yang Meng, Tingkui Wu, Hao Liu
In vitro biomechanical analysis after cervical disc replacement (CDR) with a novel artificial disc prosthesis (mobile core) was conducted and compared with the intact model, simulated fusion, and CDR with a fixed-core prosthesis. The purpose of this experimental study was to analyze the biomechanical changes after CDR with a novel prosthesis and the differences between fixed- and mobile-core prostheses.Six human cadaveric C2-C7 specimens were biomechanically tested sequentially in 4 different spinal models: intact specimens, simulated fusion, CDR with a fixed-core prosthesis (Discover, DePuy), and CDR with a mobile-core prosthesis (Pretic-I, Trauson)...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28989848/biomechanical-stability-of-a-stand-alone-interbody-spacer-in-two-level-and-hybrid-cervical-fusion-constructs
#9
Daniel G Kang, Scott C Wagner, Robert W Tracey, John P Cody, Rachel E Gaume, Ronald A Lehman
STUDY DESIGN: In vitro human cadaveric biomechanical analysis. OBJECTIVE: To evaluate the segmental stability of a stand-alone spacer (SAS) device compared with the traditional anterior cervical plate (ACP) construct in the setting of a 2-level cervical fusion construct or as a hybrid construct adjacent to a previous 1-level ACP construct. METHODS: Twelve human cadaveric cervical spines (C2-T1) were nondestructively tested with a custom 6-degree-of-freedom spine simulator under axial rotation (AR), flexion-extension (FE), and lateral bending (LB) at 1...
October 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28882520/dynamic-foraminal-dimensions-during-neck-extension-and-rotation-in-fusion-and-artificial-disc-replacement-an-observational-study
#10
Yener N Yeni, Timothy Baumer, Daniel Oravec, Azam Basheer, Colin P McDonald, Michael J Bey, Stephen W Bartol, Victor Chang
BACKGROUND: Changes in the dimensions of the cervical neural foramina (CNF) are considered to be a key factor in nerve root compression and development of cervical radiculopathy. However, to what extent foraminal geometry differs between patients who underwent anterior cervical discectomy and fusion (ACDF) and those who underwent total disc arthroplasty with an artificial disc (AD) during physiological motion is largely unknown. PURPOSE: The objective of this study is to compare CNF dimensions during physiological neck motion between ACDF and AD...
September 4, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28750946/changes-in-the-axial-orientation-of-the-zygapophyseal-joint-in-the-subaxial-cervical-spine-from-childhood-to-middle-age-and-the-biomechanical-implications-of-these-changes
#11
Mao-Yu Chen, Yu-Tse Liu, Wen-Hsing Hsu
The objective of this study was to investigate the effect of age on facet orientation (FO) of the cervical spine during development, maturation, and degeneration. Computed tomography (CT) data of the cervical spine of 131 subjects without pathology of the cervical spine were analyzed. Subjects were categorized as: pediatric (n=36, 8-16years old), young adult (n=33, 18-24years old), and middle-age (n=62, 40-59years old). Serial CT scans were reconstructed by image processing. The FO in the axial plane was measured bilaterally at each vertebral level from C3/4 to C6/7...
October 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28747987/experimental-determination-of-three-dimensional-cervical-joint-mobility-in-the-avian-neck
#12
Robert E Kambic, Andrew A Biewener, Stephanie E Pierce
BACKGROUND: Birds have highly mobile necks, but neither the details of how they realize complex poses nor the evolution of this complex musculoskeletal system is well-understood. Most previous work on avian neck function has focused on dorsoventral flexion, with few studies quantifying lateroflexion or axial rotation. Such data are critical for understanding joint function, as musculoskeletal movements incorporate motion around multiple degrees of freedom simultaneously. Here we use biplanar X-rays on wild turkeys to quantify three-dimensional cervical joint range of motion in an avian neck to determine patterns of mobility along the cranial-caudal axis...
2017: Frontiers in Zoology
https://www.readbyqxmd.com/read/28736356/finite-element-analysis-of-influence-of-axial-position-of-center-of-rotation-of-a-cervical-total-disc-replacement-on-biomechanical-parameters-simulated-2-level-replacement-based-on-a-validated-model
#13
Yang Li, Zhenjun Zhang, Zhenhua Liao, Zhongjun Mo, Weiqiang Liu
BACKGROUND: Finite element models have been widely used to predict biomechanical parameters of the cervical spine. Previous studies investigated the influence of position of rotational centers of prostheses on cervical biomechanical parameters after 1-level total disc replacement. The purpose of this study was to explore the effects of axial position of rotational centers of prostheses on cervical biomechanics after 2-level total disc replacement. METHODS: A validated finite element model of C3-C7 segments and 2 prostheses, including the rotational center located at the superior endplate (SE) and inferior endplate (IE), was developed...
October 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28723759/determining-the-relationship-of-kinesiophobia-with-respiratory-functions-and-functional-capacity-in-ankylosing-spondylitis
#14
Göktuğ Er, Ender AngIn
Ankylosing spondylitis (AS) is a common inflammatory rheumatic disease that affects the axial skeleton, causes inflammatory lower back pain, and structural and functional disorders, which affect quality of life negatively.The purpose of this study is to investigate the effects of kinesiophobia in AS on pulmonary function tests (PFTs) and functional performance.Thirty-one individuals with AS (n = 19 male, n = 12 female) who were suitable on the basis of the Modified New York (MNY) criteria were included in the study...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28715298/assessment-of-in%C3%A2-vivo-3d-kinematics-of-cervical-spine-manipulation-influence-of-practitioner-experience-and-occurrence-of-cavitation-noise
#15
Bernard Van Geyt, Pierre-Michel Dugailly, Paul Klein, Yves Lepers, Benoît Beyer, Véronique Feipel
BACKGROUND: Investigations on 3D kinematics during spinal manipulation are widely reported for assessing motion data, task reliability and clinical effects. However the link between cavitation occurrence and specific kinematics remains questionable. OBJECTIVES: This paper investigates the 3D head-trunk kinematics during high velocity low amplitude (HVLA) manipulation for different practitioners with respect to the occurrence of cavitation. METHODS: Head-trunk 3D motions were sampled during HVLA manipulation in twenty asymptomatic volunteers manipulated by four practitioners with different seniority (years of experience)...
April 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28713050/the-biomechanical-impact-of-facet-tropism-on-the-intervertebral-disc-and-facet-joints-in-the-cervical-spine
#16
Xin Rong, Beiyu Wang, Chen Ding, Yuxiao Deng, Hua Chen, Yang Meng, Weijie Yan, Hao Liu
BACKGROUND CONTEXT: Facet tropism is defined as the angular difference between the left and the right facet orientation. Facet tropism was suggested to be associated with the disc degeneration and facet degeneration in the lumbar spine. However, little is known about the relationship between facet tropism and pathologic changes in the cervical spine and the mechanism behind. PURPOSE: This study was conducted to investigate the biomechanical impact of facet tropism on the intervertebral disc and facet joints...
July 13, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28710045/management-of-pediatric-atlantoaxial-rotatory-subluxation-with-a-simple-handmade-cervical-traction-device-doing-more-with-less
#17
Mohammad Sadegh Masoudi, Nima Derakhshan, Fariborz Ghaffarpasand, Tayebeh Sadeghpour
OBJECTIVES: To introduce a novel traction device for management of pediatric atlanto-axial rotatory subluxation (AARS) in source limiting areas. BACKGROUND: Atlanto-axial (C1-C2) joint is accountable for up to two third of total axial craniocervical rotation. Its major role in pivotal rotation of cervical spine makes it more vulnerable to a certain type of injury known as AARS. Management of AARS is based on the Fielding classification which includes closed reduction and immobilization and cervical fusion in unstable cases...
October 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28678026/transoral-closed-reduction-of-fixed-atlanto-axial-rotatory-subluxation-aars-in-childhood-and-adolescence
#18
Dezsoe Jeszenszky, Tamas Fekete, Frank Kleinstück, Daniel Haschtmann, Markus Loibl
Atlanto-axial rotatory-subluxation (AARS) is the most common pediatric cervical spine injury. Patients usually present with contralateral rotation and inclination of the upper cervical spine after minor trauma, or associated with an infection of the upper respiratory tract. According to the authors, initial management of patients with acute and chronic AARS type I-II should comprise closed reduction and immobilization with a cervical collar or a Halo-Body-Jacket. Surgical options of open reduction or C1/2 fusion should be restricted to irreducible or recurrent subluxations...
July 3, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28673824/incorporating-ligament-laxity-in-a-finite-element-model-for-the-upper-cervical-spine
#19
Timothy L Lasswell, Duane S Cronin, John B Medley, Parham Rasoulinejad
BACKGROUND CONTEXT: Predicting physiological range of motion (ROM) using a finite element (FE) model of the upper cervical spine requires the incorporation of ligament laxity. The effect of ligament laxity can be observed only on a macro level of joint motion and is lost once ligaments have been dissected and preconditioned for experimental testing. As a result, although ligament laxity values are recognized to exist, specific values are not directly available in the literature for use in FE models...
June 30, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28606250/-three-dimensional-finite-element-model-of-a-modified-posterior-cervical-single-open-door-laminoplasty
#20
Q Wang, Y Yang, Q Fei, D Li, J J Li, H Meng, N Su, Z H Fan, B Q Wang
Objective: To build a three-dimensional finite element models of a modified posterior cervical single open-door laminoplasty with short-segmental lateral mass screws fusion. Methods: The C(2)-C(7) segmental data were obtained from computed tomography (CT) scans of a male patient with cervical spondylotic myelopathy and spinal stenosis.Three-dimensional finite element models of a modified cervical single open-door laminoplasty (before and after surgery) were constructed by the combination of software package MIMICS, Geomagic and ABAQUS...
June 6, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
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