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Cervical spine biomechanics

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https://www.readbyqxmd.com/read/29227919/a-subject-specific-biomechanical-control-model-for-the-prediction-of-cervical-spine-muscle-forces
#1
Maxim Van den Abbeele, Fan Li, Vincent Pomero, Dominique Bonneau, Baptiste Sandoz, Sébastien Laporte, Wafa Skalli
BACKGROUND: The aim of the present study is to propose a subject-specific biomechanical control model for the estimation of active cervical spine muscle forces. METHODS: The proprioception-based regulation model developed by Pomero et al. (2004) for the lumbar spine was adapted to the cervical spine. The model assumption is that the control strategy drives muscular activation to maintain the spinal joint load below the physiological threshold, thus avoiding excessive intervertebral displacements...
December 6, 2017: Clinical Biomechanics
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
#2
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/29181398/rheumatoid-arthritis-affecting-the-upper-cervical-spine-biomechanical-assessment-of-the-stabilizing-ligaments
#3
Carolin Meyer, Jan Bredow, Elisa Heising, Peer Eysel, Lars Peter Müller, Gregor Stein
Diameters of anterior and posterior atlantodental intervals (AADI and PADI) are diagnostically conclusive regarding ongoing neurological disorders in rheumatoid arthritis. MRI and X-ray are mostly used for patients' follow-up. This investigation aimed at analyzing these intervals during motion of cervical spine, when transverse and alar ligaments are damaged. AADI and PADI of 10 native, human cervical spines were measured using lateral fluoroscopy, while the spines were assessed in neutral position first, in maximal inclination second, and in maximal extension at last...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29173440/laminectomy-with-or-without-fusion-to-manage-degenerative-cervical-myelopathy
#4
REVIEW
Fahad H Abduljabbar, Alisson R Teles, Rakan Bokhari, Michael Weber, Carlo Santaguida
Stand-alone cervical laminectomy for degenerative cervical myelopathy (DCM) has become increasingly rare due to risk of postlaminectomy kyphosis. This article discusses the biomechanics of cervical degeneration and how laminectomy effects spine stability, and summarizes relevant clinical studies to help guide surgical decision-making for the posterior treatment of DCM. Laminectomy and fusion remains a safe and efficacious treatment. Stand-alone laminectomy should only be used for a highly selected patient population with relative stiff lordotic cervical spines, using care to not disrupt facets and C2 and C7 muscle attachments...
January 2018: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/29133006/anterior-transdiscal-axial-screw-fixation-for-subaxial-cervical-spine-a-biomechanical-study
#5
Minghui Zheng, Wei Ji, Lin Zou, Zhiping Huang, Qingan Zhu, Dongbin Qu
No abstract text is available yet for this article.
November 10, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29133003/atlantooccipital-rotatory-dislocation-a-case-report-and-systematic-review
#6
REVIEW
Luis A Robles, Greg M Mundis, Abel Cuevas-Solórzano
BACKGROUND: Atlanto-occipital rotatory dislocation (AORD) has been rarely reported in the literature; for this reason, the clinical-radiological characteristics of this injury are not well described. METHODS: The authors describe the case of a 67 years old male who sustained a cervical spine trauma. He only referred neck pain and was neurologically intact. The CT scan showed a rotatory displacement of the atlanto-occipital joints (AOJs) associated with a widened condylar-C1 interval; in addition, the MRI revealed injuries to the stabilizing ligaments of this area...
November 10, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29110218/cervical-sagittal-balance-a-biomechanical-perspective-can-help-clinical-practice
#7
REVIEW
Avinash G Patwardhan, Saeed Khayatzadeh, Robert M Havey, Leonard I Voronov, Zachary A Smith, Olivia Kalmanson, Alexander J Ghanayem, William Sears
PURPOSE: In this article, we summarize our work on understanding the influence of cervical sagittal malalignment on the mechanics of the cervical spine. METHODS: Biomechanical studies were performed using an ex vivo laboratory model to study the kinematic and kinetic response of human cervical spine specimens in the setting of cervical sagittal imbalance. The model allowed controlled variations of C2-C7 Sagittal Vertical Alignment (C2-C7 SVA) and T1-Slope so that clinically relevant sagittally malaligned profiles could be prescribed, while maintaining horizontal gaze, and their biomechanical consequences studied...
November 6, 2017: European Spine Journal
https://www.readbyqxmd.com/read/29107220/do-longus-capitis-and-colli-really-stabilise-the-cervical-spine-a-study-of-their-fascicular-anatomy-and-peak-force-capabilities
#8
Ewan Kennedy, Michael Albert, Helen Nicholson
BACKGROUND: Longus capitis and colli are proposed to play a role in stabilising the cervical spine, targeted in clinical and research practice with cranio-cervical flexion. However, it is not clear if these muscles are anatomically or biomechanically suited to a stabilising role. OBJECTIVES: To describe the fascicular morphology of the longus capitis and colli, and estimate their peak force generating capabilities across the individual cervical motion segments. STUDY DESIGN: Biomechanical force modelling based on anatomical data...
October 16, 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/29100186/biomechanics-of-anterior-plating-failure-in-treating-distractive-flexion-injury-in-the-caudal-subaxial-cervical-spine
#9
Zhong Wang, Hui Zhao, Ji-Ming Liu, Rui Chao, Tai-Bang Chen, Li-Wen Tan, Feng Zhu, Jian-Hua Zhao, Peng Liu
BACKGROUND: Operative level is a potential biomechanical risk factor for construct failure during anterior fixation for distractive flexion injury. No biomechanical study of this concept has been reported, although it is important in clinical management. METHODS: To explore the mechanism of this concept, a previously validated three-dimensional C2-T1 finite element model was modified to simulate surgical procedure via the anterior approach for treating single-level distractive flexion injury, from C2-C3 to C7-T1...
October 19, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29097958/unresolved-congenital-torticollis-and-its-consequences-a-report-of-2-cases
#10
Mette Hobaek Siegenthaler
Objective: The purpose of this report was to describe the clinical presentation and case management of 2 children with congenital torticollis. Clinical Features: Two male children (ages 6 and 10 years) presented to a chiropractic clinic with a history of congenital torticollis. They showed signs and symptoms of postural deficiency and developmental delay: posterior plagiocephaly, facial scoliosis, head tilt, compensatory thoracic scoliosis, decreased range of motion in the cervical spine, palpable decreased segmental motion of the upper cervical spine, and an age-related delay in throwing and catching a ball and in one-leg standing...
September 2017: Journal of Chiropractic Medicine
https://www.readbyqxmd.com/read/29096033/cervical-spine-deformity-part-3-posterior-techniques-clinical-outcome-and-complications
#11
Lee A Tan, K Daniel Riew, Vincent C Traynelis
The goals of cervical deformity surgery include deformity correction, restoration of horizontal gaze, decompression of neural elements, spinal stabilization with a biomechanically sound construct, and meticulous arthrodesis technique to prevent pseudoarthrosis and minimizing surgical complications. Many different surgical options exist, but selecting the correct approach that ensures the optimal clinical outcome can be challenging and often controversial. In this last part of the cervical deformity review series, various posterior deformity correction techniques are discussed in detail, along with an overview of surgical outcome and postoperative complications...
October 31, 2017: Neurosurgery
https://www.readbyqxmd.com/read/29093783/the-skipped-segment-screw-construct-an-alternative-to-conventional-lateral-mass-fixation-biomechanical-analysis-in-a-porcine-cervical-spine-model
#12
Kedar Prashant Padhye, Yuvaraja Murugan, Raunak Milton, N Arunai Nambi Raj, Kenny Samuel David
Study Design: Cadaveric biomechanical study. Purpose: We compared the "skipped segment screw" (SSS) construct with the conventional "all segment screw" (ASS) construct for cervical spine fixation in six degrees of freedom in terms of the range of motion (ROM). Overview of Literature: Currently, no clear guidelines are available in the literature for the configuration of lateral mass (LM) screwrod fixation for cervical spine stabilization. Most surgeons tend to insert screws bilaterally at all segments from C3 to C6 with the assumption that implants at every level will provide maximum stability...
October 2017: Asian Spine Journal
https://www.readbyqxmd.com/read/29089564/prognostic-value-of-lordosis-decrease-in-radiographic-adjacent-segment-pathology-after-anterior-cervical-corpectomy-and-fusion
#13
Yin Liu, Na Li, Wei Wei, Jing Deng, Yuequn Hu, Bin Ye, Wei Wang
While cervical lordosis alteration is not uncommon after anterior cervical arthrodesis, its influence on radiological adjacent segment pathology (RASP) is still unclear. Biomechanical changes induced by arthrodesis may contribute to ASP onset. To investigate the correlation between cervical lordosis decrease and RASP onset after anterior cervical corpectomy and fusion (ACCF) and to determine its biomechanical effect on adjacent segments after surgery, 80 CSM patients treated with ACCF were retrospectively studied, and a baseline finite element model of the cervical spine as well as post-operation models with normal and decreased lordosis were established and validated...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29076333/the-influence-of-natural-head-position-on-the-cervical-sagittal-alignment
#14
Kuan Wang, Zhen Deng,, Zhengyan Li, Huihao Wang, Hongsheng Zhan
Introduction: This study investigated the relationship between the parameters related to the natural head position and cervical segmental angles and alignment of patients with neck pain. Material and Methods: The lateral radiographs of the cervical spine were collected from 103 patients and were used to retrospectively analyze the correlation between the natural head position, cervical local sagittal angles, and alignment. Sagittal measurements were as follows: cervical curvature classification, slope of McGregor's line (McGS), local sagittal angles (C0–C2 angle, C2–C5 angle, C5–C7 angle, and C2–C7 angle), T1 slope, center of gravity of the head to sagittal vertical axis (CG–C7 SVA), and local sagittal alignment (C0–C2 SVA and C2–C7 SVA)...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29065584/the-influence-of-natural-head-position-on-the-cervical-sagittal-alignment
#15
Kuan Wang, Zhen Deng, Zhengyan Li, Huihao Wang, Hongsheng Zhan
INTRODUCTION: This study investigated the relationship between the parameters related to the natural head position and cervical segmental angles and alignment of patients with neck pain. MATERIAL AND METHODS: The lateral radiographs of the cervical spine were collected from 103 patients and were used to retrospectively analyze the correlation between the natural head position, cervical local sagittal angles, and alignment. Sagittal measurements were as follows: cervical curvature classification, slope of McGregor's line (McGS), local sagittal angles (C0-C2 angle, C2-C5 angle, C5-C7 angle, and C2-C7 angle), T1 slope, center of gravity of the head to sagittal vertical axis (CG-C7 SVA), and local sagittal alignment (C0-C2 SVA and C2-C7 SVA)...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29053719/total-disc-replacement-using-tissue-engineered-intervertebral-discs-in-the-canine-cervical-spine
#16
Yu Moriguchi, Jorge Mojica-Santiago, Peter Grunert, Brenton Pennicooke, Connor Berlin, Thamina Khair, Rodrigo Navarro-Ramirez, Rodolfo J Ricart Arbona, Joseph Nguyen, Roger Härtl, Lawrence J Bonassar
The most common reason that adults in the United States see their physician is lower back or neck pain secondary to degenerative disc disease. To date, approaches to treat degenerative disc disease are confined to purely mechanical devices designed to either eliminate or enable flexibility of the diseased motion segment. Tissue engineered intervertebral discs (TE-IVDs) have been proposed as an alternative approach and have shown promise in replacing native IVD in the rodent tail spine. Here we demonstrate the efficacy of our TE-IVDs in the canine cervical spine...
2017: PloS One
https://www.readbyqxmd.com/read/29053084/intubation-biomechanics-validation-of-a-finite-element-model-of-cervical-spine-motion-during-endotracheal-intubation-in-intact-and-injured-conditions
#17
Benjamin C Gadomski, Snehal S Shetye, Bradley J Hindman, Franklin Dexter, Brandon G Santoni, Michael M Todd, Vincent C Traynelis, Robert P From, Ricardo B Fontes, Christian M Puttlitz
OBJECTIVE Because of limitations inherent to cadaver models of endotracheal intubation, the authors' group developed a finite element (FE) model of the human cervical spine and spinal cord. Their aims were to 1) compare FE model predictions of intervertebral motion during intubation with intervertebral motion measured in patients with intact cervical spines and in cadavers with spine injuries at C-2 and C3-4 and 2) estimate spinal cord strains during intubation under these conditions. METHODS The FE model was designed to replicate the properties of an intact (stable) spine in patients, C-2 injury (Type II odontoid fracture), and a severe C3-4 distractive-flexion injury from prior cadaver studies...
October 20, 2017: Journal of Neurosurgery. Spine
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
#18
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/29027895/changes-in-foraminal-area-with-anterior-decompression-versus-keyhole-foraminotomy-in-the-cervical-spine-a-biomechanical-investigation
#19
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
#20
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
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