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Cervical spine biomechanics

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https://www.readbyqxmd.com/read/29027895/changes-in-foraminal-area-with-anterior-decompression-versus-keyhole-foraminotomy-in-the-cervical-spine-a-biomechanical-investigation
#1
Jacqueline Nguyen, Bryant Chu, Calvin C Kuo, Jeremi M Leasure, Christopher Ames, Dimitriy Kondrashov
OBJECTIVE Anterior cervical discectomy and fusion (ACDF) with or without partial uncovertebral joint resection (UVR) and posterior keyhole foraminotomy are established operative procedures to treat cervical disc degeneration and radiculopathy. Studies have demonstrated reliable results with each procedure, but none have compared the change in neuroforaminal area between indirect and direct decompression techniques. The purpose of this study was to determine which cervical decompression method most consistently increases neuroforaminal area and how that area is affected by neck position...
October 13, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29021885/fracture-dislocation-at-c6-c7-level-with-quadriplegia-after-traditional-massage-in-a-patient-with-ankylosing-spondylitis-a-case-report
#2
Kak Abilash, Qmq Mohd, Zah Ahmad, Basir Towil
Ankylosing spinal disorders (ASD) tend to result in fractures and/or dislocations after minor trauma because of the altered biomechanical properties. The relative risk of traumatic vertebral fractures in patients with ankylosing spondylitis has been estimated as three times higher than in the general population. These spine traumas, which are located at cervical level in 81% of patients with ankylosing spondylitis, are complicated by neurological lesions in 65% of patients, due to the high inherent instability of these fractures...
July 2017: Malaysian Orthopaedic Journal
https://www.readbyqxmd.com/read/28989848/biomechanical-stability-of-a-stand-alone-interbody-spacer-in-two-level-and-hybrid-cervical-fusion-constructs
#3
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/28965451/instrumented-fusion-for-spinal-deformity-after-laminectomy-or-laminoplasty-for-resection-of-intramedullary-spinal-cord-tumors-in-pediatric-patients
#4
David S Hersh, Rajiv R Iyer, Tomas Garzon-Muvdi, Ann Liu, George I Jallo, Mari L Groves
OBJECTIVE Spinal deformity has become a well-recognized complication of intramedullary spinal cord tumor (IMSCT) resection. In particular, laminectomy can result in biomechanical instability caused by loss of the posterior tension band. Therefore, laminoplasty has been proposed as an alternative to laminectomy. Here, the authors describe the largest current series of pediatric patients who have undergone laminoplasty for IMSCT resection and investigate the need for surgical fusion after both laminectomy and laminoplasty...
October 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28965445/temporary-occipital-fixation-in-young-children-with-severe-cervical-thoracic-spinal-deformity
#5
Brian J Kelley, Anas A Minkara, Peter D Angevine, Michael G Vitale, Lawrence G Lenke, Richard C E Anderson
OBJECTIVE The long-term effects of instrumentation and fusion of the occipital-cervical-thoracic spine on spinal growth in young children are poorly understood. To mitigate the effects of this surgery on the growing pediatric spine, the authors report a novel technique used in 4 children with severe cervical-thoracic instability. These patients underwent instrumentation from the occiput to the upper thoracic region for stabilization, but without bone graft at the craniovertebral junction (CVJ). Subsequent surgery was then performed to remove the occipital instrumentation, thereby allowing further growth and increased motion across the CVJ...
October 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28960818/biomechanical-stability-analysis-of-a-stand-alone-cage-static-and-rotational-dynamic-plate-in-a-two-level-cervical-fusion-construct
#6
Parmenion P Tsitsopoulos, Leonard I Voronov, Michael R Zindrick, Gerard Carandang, Robert M Havey, Alexander J Ghanayem, Avinash G Patwardhan
OBJECTIVE: To test the following hypotheses: (i) anterior cervical discetomy and fusion (ACDF) using stand-alone interbody spacers will significantly reduce the range of motion from intact spine; and (ii) the use of a static or a rotational-dynamic plate will significantly augment the stability of stand-alone interbody spacers, with similar beneficial effect when compared to each other. METHODS: Eleven human cadaveric subaxial cervical spines (age: 48.2 ± 5.4 years) were tested under the following sequence: (i) intact spine; (ii) ACDF at C4 -C5 using a stand-alone interbody spacer; (iii) ACDF at C5 -C6 and insertion of an interbody spacer (two-level construct); and (iv) randomized placement of either a two-level locking static plate or a rotational-dynamic plate...
August 2017: Orthopaedic Surgery
https://www.readbyqxmd.com/read/28934448/cervical-spine-deformity-part-2-management-algorithm-and-anterior-techniques
#7
Lee A Tan, K Daniel Riew, Vincent C Traynelis
A sound operative plan based on solid understanding of the pathology and biomechanics is the most important part of cervical deformity correction. Many different surgical options exist for operative management of cervical spine deformities. However, selecting the correct approach that ensures the optimal clinical outcome can be challenging and often controversial. In Part 2 of this three-part review series, we discuss the pre-operative planning, management algorithm, and anterior surgical techniques for cervical deformity correction...
October 1, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28890223/a-new-iphone-%C3%A2-application-for-measuring-active-craniocervical-range-of-motion-in-patients-with-non-specific-neck-pain-a-reliability-and-validity-study
#8
Mohammad Reza Pourahmadi, Rasool Bagheri, Morteza Taghipour, Ismail Ebrahimi Takamjani, Javad Sarrafzadeh, Mohammad Ali Mohseni-Bandpei
BACKGROUND CONTEXT: Measurement of cervical spine range of motion (ROM) is often considered to be an essential component of cervical spine physiotherapy assessment. PURPOSE: To investigate the reliability and validity of an iPhone(®) app (Goniometer Pro(©)) for measuring active craniocervical ROM (ACCROM) in patients with non-specific neck pain. STUDY DESIGN/SETTING: A cross-sectional study was conducted at the musculoskeletal biomechanics laboratory located at Iran University of Medical Sciences...
September 7, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28885964/cervical-joint-position-sense-in-hypobaric-conditions-a-randomized-double-blind-controlled-trial
#9
Diana Bagaianu, Damien Van Tiggelen, N Duvigneaud, Veerle Stevens, Danny Schroyen, Dirk Vissenaeken, Gino D'Hondt, Laurent Pitance
Well-adapted motor actions require intact and well-integrated information from all of the sensory systems, specifically the visual, vestibular, and somatosensory systems, including proprioception. Proprioception is involved in the sensorimotor control by providing the central nervous system with an updated body schema of the biomechanical and spatial properties of the body parts. With regard to the cervical spine, proprioceptive information from joint and muscle mechanoreceptors is integrated with vestibular and visual feedback to control head position, head orientation, and whole body posture...
September 2017: Military Medicine
https://www.readbyqxmd.com/read/28852840/biomechanical-study-of-novel-unilateral-c1-posterior-arch-screws-and-c2-laminar-screws-combined-with-an-ipsilateral-crossed-c1-c2-pedicle-screw-rod-fixation-for-atlantoaxial-instability
#10
Kai Shen, Zhongliang Deng, Junsong Yang, Chao Liu, Ranxi Zhang
INTRODUCTION: Current surgical methods to treat atlantoaxial instability pose potential risks to the surrounding blood vessels and nerves of operative approach. Therefore, more secure and highly effective methods are expected. This study sought to assess the biomechanical efficacy of a novel unilateral double screw-rod fixation system by comparing with traditional and emerging fixation methods in cadaveric models. MATERIALS AND METHODS: Ligamentous cervical spines (C0-C7) from ten fresh cadaveric specimens were used to complete range of motion (ROM) test in their intact condition (control group), destabilization, and stabilization after different fixations, including unilateral C1-C2 pedicle screws (PS) with a screw-rod system (Group A), bilateral C1-C2 PS with screw-rod systems (Group B), unilateral C1 posterior arch screws (PAS) and C2 laminar screws (LS) combined with an ipsilateral paralleled C1-C2 PS-rod (Group C), and unilateral C1 PAS and C2 LS combined with an ipsilateral crossed C1-C2 PS-rod (Group D)...
August 29, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28838143/cervical-spine-deformity-part-1-biomechanics-radiographic-parameters-and-classification
#11
Lee A Tan, K Daniel Riew, Vincent C Traynelis
Cervical spine deformities can have a significant negative impact on the quality of life by causing pain, myelopathy, radiculopathy, sensorimotor deficits, as well as inability to maintain horizontal gaze in severe cases. Many different surgical options exist for operative management of cervical spine deformities. However, selecting the correct approach that ensures the optimal clinical outcome can be challenging and is often controversial. We aim to provide an overview of cervical spine deformity in a 3-part series covering topics including the biomechanics, radiographic parameters, classification, treatment algorithms, surgical techniques, clinical outcome, and complication avoidance with a review of pertinent literature...
August 1, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28826710/biomechanical-analysis-of-bilateral-facet-joint-stabilization-using-bio-derived-tendon-for-posterior-cervical-spine-motion-reservation-in-goats
#12
Bei-Yu Wang, Ting-Kui Wu, Hao Liu, Wei-Guang Hou, Li-Tai Ma, Yu-Xiao Deng, Chen Ding, Ying Hong, Hui-Qi Xie
OBJECTIVES: To investigate the biomechanical properties of a novel stabilization method for posterior cervical motion preservation using bio-derived freeze-dried tendon. METHODS: Experiments were conducted both in vitro and in vivo. For the in vitro group, fifteen fresh-frozen goat spines (C1-C7) were randomly divided into three subgroups: intact (INT-vitro, n=5), injury model (IM-vitro, n=5) and bilateral facet joint stabilization (BFJS-vitro, n=5) subgroups. For the in vivo group, fifteen adult goats were randomly divided into three experimental subgroups: INT-vivo subgroup (n=5); IM-vivo subgroup (n=5); BFJS-vivo subgroup (n=5)...
August 4, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28811992/analysis-of-the-literature-on-cervical-spine-fractures-in-ankylosing-spinal-disorders
#13
REVIEW
Sebastian Hartmann, Anja Tschugg, Christoph Wipplinger, Claudius Thomé
STUDY DESIGN: Narrative literature review. OBJECTIVE: The numbers of low-energy cervical fractures seen in patients suffering from ankylosing spondylitis (also known as Bechterew disease) or diffuse idiopathic skeletal hyperostosis (also known as Forestier disease) have greatly increased over recent decades. These fractures tend to be particularly overlooked, leading to delayed diagnosis and secondary neurological deterioration. The aim of the present evaluation was to summarize current knowledge on cervical fractures in patients with ankylosing spinal disorders (ASDs)...
August 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28776221/-injuries-of-the-upper-cervical-spine-update-on-diagnostics-and-management
#14
Matti Scholz, Frank Kandziora, Frank Hildebrand, Philipp Kobbe
Injuries to the upper cervical spine represent a diagnostic and therapeutic challenge to the treating surgeon due to the complex anatomical relationships and biomechanical features. In this further education article the diagnostic principles, established classifications and therapeutic recommendations as well as injury-specific characteristics of bony and ligamentous injuries to the upper cervical spine (C0-C2) are presented.
August 3, 2017: Der Unfallchirurg
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
#15
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/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
#16
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/28736113/titanium-vs-polyetheretherketone-peek-interbody-fusion-meta-analysis-and-review-of-the-literature
#17
REVIEW
Scott Seaman, Panagiotis Kerezoudis, Mohamad Bydon, James C Torner, Patrick W Hitchon
Spinal interbody fusion is a standard and accepted method for spinal fusion. Interbody fusion devices include titanium (Ti) and polyetheretherketone (PEEK) cages with distinct biomechanical properties. Titanium and PEEK cages have been evaluated in the cervical and lumbar spine, with conflicting results in bony fusion and subsidence. Using Preferred Reporting Items for Systematic reviews and Meta-analyses (PRISMA) guidelines, we reviewed the available literature evaluating Ti and PEEK cages to assess subsidence and fusion rates...
October 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28731832/effects-of-cervical-high-velocity-low-amplitude-techniques-on-range-of-motion-strength-performance-and-cardiovascular-outcomes-a-review
#18
Xabier Galindez-Ibarbengoetxea, Igor Setuain, Lars L Andersen, Robinson Ramírez-Velez, Miriam González-Izal, Andoni Jauregi, Mikel Izquierdo
BACKGROUND: Cervical high-velocity low-amplitude (HVLA) manipulation technique is among the oldest and most frequently used chiropractic manual therapy, but the physiologic and biomechanics effects were not completely clear. OBJECTIVE: This review aims to describe the effects of cervical HVLA manipulation techniques on range of motion, strength, and cardiovascular performance. METHODS/DESIGN: A systematic search was conducted of the electronic databases from January 2000 to August 2016: PubMed (n = 131), ScienceDirect (n = 101), Scopus (n = 991), PEDro (n = 33), CINAHL (n = 884), and SciELO (n = 5)...
September 2017: Journal of Alternative and Complementary Medicine: Research on Paradigm, Practice, and Policy
https://www.readbyqxmd.com/read/28714657/women-with-late-whiplash-syndrome-have-greatly-reduced-load-bearing-of-the-cervical-spine-in-vivo-biomechanical-cross-sectional-lateral-radiographic-study
#19
Eythor Kristjansson, Magnus K Gislason
BACKGROUND: No study has been conducted to ascertain whether the load-bearing capacity of the cervical spine is reduced in vivo in late whiplash syndrome (LWS). AIM: To compare the segmental cervical angular values across C0-C6, between two conditions: without versus with external axial load upon the head in three groups of women. DESIGN: A single-blind, age-Body Mass Index (BMI) matched, radiographic, cross-sectional study. SETTING: Radiographic Department at a University Hospital...
July 17, 2017: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28713084/evalution-of-the-effectiveness-of-multimodal-approach-to-the-management-of-cervical-vertigo
#20
Olexandr A Jaroshevskyi, Oleksandr S Payenok, Anna V Logvinenko
INTRODUCTION: Vertigo is one of the most common complaints among patients consulting neurologists and general practitioners - family medicine. A special form of dizziness is cervical vertigo. However, the presence of chronic vertigo and imbalance in this group of patients makes it possible to include the treatment of vestibular rehabilitation in the program. AIM: Evalution of the effectiveness of multimodal approach to the management of cervical vertigo. MATERIAL AND METHODS: 109 patients aged from 18 to 45 with vertigo together with myofascial pain syndrome of neck and shoulder area were examined...
2017: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
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