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Cervical spine biomechanics

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https://www.readbyqxmd.com/read/29889800/highly-cited-works-in-spinal-disorders-the-top-100-most-cited-papers-published-in-spine-journals
#1
Jetan H Badhiwala, Farshad Nassiri, Christopher D Witiw, Alireza Mansouri, Naif Alotaibi, Matthew Eagles, Saleh A Almenawer, Leodante da Costa, Jefferson R Wilson, Michael G Fehlings
STUDY DESIGN: Bibliometric analysis. OBJECTIVE: To identify, and summarize the key findings of, the top 100 most highly cited works published in spinal disorder topic-specific journals. SUMMARY OF BACKGROUND DATA: There is an abundance of published articles pertaining to spine surgery and spinal disorders. The number of citations a work receives provides a useful measure of its scientific impact. An understanding of the most cited works in spine surgery can identify literature that surgeons and researchers should be familiar with, point to the most active areas of research, inform the design of educational curricula, and help guide future research efforts...
June 8, 2018: Spine
https://www.readbyqxmd.com/read/29881231/biomechanical-comparison-of-a-novel-c1-posterior-u-construct-with-four-other-techniques-in-a-c1-c2-fixation-model
#2
Joshua P Herzog, Nicholas J Zarkadis, Gautham Prabhakar, Nicholas A Kusnezov
Background: Compare the biomechanical stability of a novel "U" posterior cervical fixation construct to four other posterior cervical atlantoaxial fixation constructs. Methods: Eight fresh frozen human cadaver spines were tested after a simulated odontoid fracture, and following stabilization with each construct. Results: All constructs significantly decreased flexion-extension and axial rotation compared to the destabilized spine...
June 2018: Journal of Orthopaedics
https://www.readbyqxmd.com/read/29878713/comparative-study-between-m6-c-and-mobi-c-cervical-artificial-disc-replacement-biomechanical-outcomes-and-comparison-with-normative-data
#3
My Pham, Kevin Phan, Ian Teng, Ralph J Mobbs
OBJECTIVE: Cervical spondylosis affects a huge proportion of the middle-aged population. Degenerative changes can occur in multiple regions of the cervical spine typically affecting the joints, intervertebral discs and endplates. These changes lead to compression of adjacent nervous structures, which results in radiculopathic and myelopathic pain. Various treatment modalities are currently available with non-surgical approaches the initial go to if there is no symptomatic cord compression...
May 2018: Orthopaedic Surgery
https://www.readbyqxmd.com/read/29852313/the-rib-cage-stiffens-the-thoracic-spine-in-a-cadaveric-model-with-body-weight-load-under-dynamic-moments
#4
Erin M Mannen, Elizabeth A Friis, Hadley L Sis, Benjamin M Wong, Eileen S Cadel, Dennis E Anderson
The thoracic spine presents a challenge for biomechanical testing. With more segments than the lumbar and cervical regions and the integration with the rib cage, experimental approaches to evaluate the mechanical behavior of cadaveric thoracic spines have varied widely. Some researchers are now including the rib cage intact during testing, and some are incorporating follower load techniques in the thoracic spine. Both of these approaches aim to more closely model physiological conditions. To date, no studies have examined the impact of the rib cage on thoracic spine motion and stiffness in conjunction with follower loads...
May 16, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29804415/-analysis-of-a-three-dimensional-finite-element-model-of-atlas-and-axis-complex-fracture
#5
X M Tang, C Liu, K Huang, G T Zhu, H L Sun, J Dai, J W Tian
Objective: To explored the clinical application of the three-dimensional finite element model of atlantoaxial complex fracture. Methods: A three-dimensional finite element model of cervical spine (FEM/intact) was established by software of Abaqus6.12.On the basis of this model, a three-dimensional finite element model of four types of atlantoaxial complex fracture was established: C(1) fracture (Jefferson)+ C(2) fracture (type Ⅱfracture), Jefferson+ C(2) fracture(type Ⅲfracture), Jefferson+ C(2) fracture(Hangman), Jefferson+ stable C(2) fracture (FEM/fracture)...
May 22, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29783086/biomechanical-comparison-of-cemented-vs-non-cemented-anterior-screw-fixation-in-type-ii-odontoid-fractures-in-the-elderly-a-cadaveric-study
#6
Petr Rehousek, Edward Jenner, James Holton, Marcin Czyz, Lukas Capek, Petr Henys, Marketa Kulvajtova, Martin Krbec, Jiri Skala-Rosenbaum
Background Context Odontoid process fractures are the most common injuries of the cervical spine in the elderly. Anterior screw stabilisation of type 2 odontoid process fractures improves survival and function in these patients but may be complicated by failure of fixation. Purpose To determine whether cement augmentation of a standard anterior screw provides biomechanically superior fixation of type II odontoid fractures in comparison to a non-cemented standard screw. Study design Twenty human cadaveric C2 vertebrae from elderly donors (mean age 83 years) were obtained...
May 18, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29746965/spine-and-lower-extremity-kinematics-during-gait-in-cervical-spondylotic-myelopathy-patients
#7
Ram Haddas, Sujal Patel, Raj Arakal, Akwasi Boah, Theodore Belanger, Kevin L Ju
BACKGROUND CONTEXT: CSM typically manifests with a slow, progressive stepwise decline in neurologic function, including hand clumsiness and balance difficulties. Gait disturbances are frequently seen in CSM patients, with more advanced cases exhibiting a stiff, spastic gait. PURPOSE: To evaluate the spatiotemporal parameters and spine and lower extremity kinematics during the gait cycle of adult cervical spondylotic myelopathy (CSM) patients prior to surgical intervention...
May 7, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29709826/preliminary-female-cervical-spine-injury-risk-curves-from-pmhs-tests
#8
Narayan Yoganandan, Sajal Chirvi, Frank A Pintar, Jamie L Baisden, Anjishnu Banerjee
The human cervical spine sustains compressive loading in automotive events and military operational activities, and the contact and noncontact loading are the two primary impact modes. Biomechanical and anatomical studies have shown differences between male and female cervical spines. Studies have been conducted to determine the human tolerance in terms of forces from postmortem human subject (PMHS) specimens from male and female spines; however, parametric risk curves specific to female spines are not available from contact loading to the head-neck complex under the axial mode...
July 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29706725/alleviation-of-neck-pain-by-the-non-surgical-rehabilitation-of-a-pathologic-cervical-kyphosis-to-a-normal-lordosis-a-cbp-%C3%A2-case-report
#9
Alyssa K Dennis, Paul A Oakley, Michael T Weiner, Tara A VanVranken, David A Shapiro, Deed E Harrison
[Purpose] To present a case of the therapeutic reversal of a cervical kyphosis into a lordosis in a patient who presented with neck pain and headaches. [Subject and Methods] A 24-year-old male irritated his neck while dancing. Upon examination it was revealed he had an excessive, 45 mm forward head translation and a 15° cervical kyphosis from C3-C6. The patient was treated with Chiropractic BioPhysics® methods aimed at restoring the cervical lordosis by mirror image® , neck extension exercises, cervical extension traction, and spinal manipulative therapy...
April 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29687674/intubation-through-2-supraglottic-airway-device-in-cervical-spine-immobilization-a-randomized-trial-of-residents-use-of-the-intubating-laryngeal-mask-airway-and-the-intubating-laryngeal-tube-in-manikins
#10
Dawid Aleksandrowicz, Tomasz Gaszyński
OBJECTIVES: The aim of this study was to compare the intubating laryngeal mask (iLM) airway and the new intubating laryngeal tube (iLTS-D) in use by residents with minimal previous intubation experience during simulated conditions of reduced cervical spine mobility. MATERIAL AND METHODS: Thirty first-year residents in anesthesiology participated in the study (18 women). All participants had minimal intubation experience (fewer than 10 previously performed intubations) and were novices in the specialty...
June 2018: Emergencias: revista de la Sociedad Española de Medicina de Emergencias
https://www.readbyqxmd.com/read/29680818/fatal-head-and-neck-injuries-in-military-underbody-blast-casualties
#11
Sarah K Stewart, A P Pearce, Jon C Clasper
INTRODUCTION: Death as a consequence of underbody blast (UBB) can most commonly be attributed to central nervous system injury. UBB may be considered a form of tertiary blast injury but is at a higher rate and somewhat more predictable than injury caused by more classical forms of tertiary injury. Recent studies have focused on the transmission of axial load through the cervical spine with clinically relevant injury caused by resultant compression and flexion. This paper seeks to clarify the pattern of head and neck injuries in fatal UBB incidents using a pragmatic anatomical classification...
April 21, 2018: Journal of the Royal Army Medical Corps
https://www.readbyqxmd.com/read/29677281/biomechanical-effects-on-cervical-spinal-cord-and-nerve-root-following-laminoplasty-for-ossification-of-the-posterior-longitudinal-ligament-in-the-cervical-spine-a-comparison-between-open-door-and-double-door-laminoplasty-using-finite-element-analysis
#12
Batbayar Khuyagbaatar, Kyungsoo Kim, Tserenchimed Purevsuren, Sang-Hun Lee, Yoon Hyuk Kim
Many clinical case series have reported the predisposing factors for C5 palsy and have presented comparisons of the two types of laminoplasty. However, there have been no biomechanical studies focusing on cervical spinal cord and nerve root following laminoplasty. The purpose of this study is to investigate biomechanical changes in the spinal cord and nerve roots following the two most common types of laminoplasty, open-door and double-door laminoplasty, for cervical ossification of the posterior longitudinal ligament (OPLL)...
July 1, 2018: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29676682/growth-and-alignment-of-the-pediatric-subaxial-cervical-spine-following-rigid-instrumentation-and-fusion-a-multicenter-study-of-the-pediatric-craniocervical-society
#13
Hannah E Goldstein, Justin A Neira, Matei Banu, Philipp R Aldana, Bruno P Braga, Douglas L Brockmeyer, Michael L DiLuna, Daniel H Fulkerson, Todd C Hankinson, Andrew H Jea, Sean M Lew, David D Limbrick, Jonathan Martin, Joshua M Pahys, Luis F Rodriguez, Curtis J Rozzelle, Gerald F Tuite, Nicholas M Wetjen, Richard C E Anderson
OBJECTIVE The long-term effects of surgical fusion on the growing subaxial cervical spine are largely unknown. Recent cross-sectional studies have demonstrated that there is continued growth of the cervical spine through the teenage years. The purpose of this multicenter study was to determine the effects of rigid instrumentation and fusion on the growing subaxial cervical spine by investigating vertical growth, cervical alignment, cervical curvature, and adjacent-segment instability over time. METHODS A total of 15 centers participated in this multi-institutional retrospective study...
April 20, 2018: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/29658148/biochemical-and-biomechanical-characterisation-of-equine-cervical-facet-joint-cartilage
#14
S A O'Leary, J L White, J C Hu, K A Athanasiou
BACKGROUND: The equine cervical facet joint is a site of significant pathology. Located bilaterally on the dorsal spine, these diarthrodial joints work in conjunction with the intervertebral disc to facilitate appropriate spinal motion. Despite the high prevalence of pathology in this joint, the facet joint is understudied and thus lacking in viable treatment options. OBJECTIVE: The goal of this study was to characterise equine facet joint cartilage and provide a comprehensive database describing the morphological, histological, biochemical and biomechanical properties of this tissue...
April 15, 2018: Equine Veterinary Journal
https://www.readbyqxmd.com/read/29656152/occipital-condyle-fractures-and-concomitant-cervical-spine-fractures-implications-for-management
#15
James L West, Atilio E Palma, Lukas Vilella, Kyle M Fargen, Charles L Branch, Stacey Q Wolfe
BACKGROUND: Occipital condyle fractures (OCFs) have traditionally been described based on anatomic characteristics; however, recent literature has proposed management based on biomechanical stability and neural element compression. The treatment of biomechanically stable fractures varies between observation and cervical immobilization. Before determining the best management approach, an understanding of concomitant cervical spine fractures in the presence of OCFs is important. The primary aim of this pilot study was to determine the rate of occurrence of biomechanically significant cervical spine fractures with OCFs...
April 12, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29651593/cervical-pedicle-screw-instrumentation-is-more-reliable-with-o-arm-based-3d-navigation-analysis-of-cervical-pedicle-screw-placement-accuracy-with-o-arm-based-3d-navigation
#16
Sourabh Chachan, Hamid Rahmatullah Bin Abd Razak, Wee Lim Loo, John Carson Allen, Dinesh Shree Kumar
PURPOSE: Despite proven biomechanical superiority and resultant superior clinical outcomes, pedicle instrumentation in cervical spine is not widely practiced due to technical difficulties, steep learning curve, and possible potential catastrophic complications due to screw misplacement. This study was undertaken with the purpose to evaluate the feasibility, accuracy, and complications of cervical pedicle screw instrumentation solely using O-arm-based 3D navigation technology. METHODS: Prospectively maintained data from a single-surgeon case series were retrospectively analyzed...
April 12, 2018: European Spine Journal
https://www.readbyqxmd.com/read/29627641/occiput-axis-crossing-translaminar-screw-fixation-technique-using-offset-connectors-an-in-vitro-biomechanical-study
#17
Jiyong Gu, Weiwei Lei, Zong Xin, Yi Wu, Lin Peng, Zhibin Li, Zize Feng, Minchan Zhao, Songtao Qi, Yuntao Lu
OBJECTIVE: Fixation with the axis vertebra (C2) using pedicle screws is commonly used to treat an unstable occipitocervical junction; however, it is accompanied by a risk of vertebral artery injury. The occiput-C2 (OC2) crossing translaminar screw fixation technique may avoid this risk, but rod implantation is difficult. Offset connectors can help facilitate this construct. This study aimed to evaluate the stability of a technique for OC2 crossing translaminar screw fixation using offset connectors (C2LAM + OF) in comparison with other methods...
June 2018: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29627629/hybrid-constructs-for-performing-three-level-hybrid-surgery-a-finite-element-study
#18
Yang Li, Jia Zhu, Zhenhua Liao, Zhenjun Zhang, Weiqiang Liu
OBJECTIVE: To systematically investigate the effect of 3-level hybrid constructs on the cervical spine biomechanics based on a validated model of the C3-C7 segments. METHODS: Three hybrid constructs with 2 U-shaped dynamic cervical implants and 1 cage were simulated. The 3 constructs were 1) Cage-U-U (cage implanted at the C3-C4 level and U-shaped dynamic cervical implants implanted at the C4-C5 and C5-C6 levels), 2) U-Cage-U, and 3) U-U-Cage. Biomechanical parameters including moments, cervical motions, and stresses in the facet and implants were analyzed in flexion and extension...
June 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29626690/traumatic-posterolateral-c1-c2-dislocation-complicated-with-locked-lateral-mass-and-type-ii-odontoid-fracture-5-year-follow-up
#19
Zhu Minyu, Wu Shiyang, Chandoo Suraj, Huang Kelun, Lin Chaowei, Teng Honglin
OBJECTIVE: We sought to document our experience in managing a rare complex of traumatic posterolateral atlantoaxial dislocation combined with locked lateral mass and type II odontoid fracture. METHOD: A 30-year-old male patient was referred to the author's department. He complained of a decrease in neck range of motion following a traffic accident. Neurologic examination was normal. Computed tomography and open-mouth radiographs showed a type II odontoid fracture and a posterolateral dislocation with a laterally locked left lateral mass at the C1-C2 level...
June 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29557926/stiffness-matters-part-ii-the-effects-of-plate-stiffness-on-load-sharing-and-the-progression-of-fusion-following-acdf-in-vivo
#20
Joshua M Peterson, Carolyn Chlebek, Ashley M Clough, Alexandra K Wells, Kathleen E Batzinger, John M Houston, Katerina Kradinova, Joseph C Glennon, Darryl J DiRisio, Eric H Ledet
STUDY DESIGN: Real time in vivo measurement of forces in the cervical spine of goats following anterior cervical discectomy and fusion (ACDF). OBJECTIVE: To measure interbody forces in the cervical spine during the time course of fusion following ACDF with plates of different stiffnesses. SUMMARY OF BACKGROUND DATA: Following ACDF, the biomechanics of the arthrodesis is largely dictated by the plate. The properties of the plate prescribe the extent of load-sharing through the disc space versus the extent of stress-shielding...
March 19, 2018: Spine
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