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Cervical spine biomechanics

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https://www.readbyqxmd.com/read/28444241/cervical-spine-muscle-tendon-unit-length-differences-between-neutral-and-forward-head-postures-biomechanical-study-using-human-cadaveric-specimens
#1
Saeed Khayatzadeh, Olivia A Kalmanson, Dale Schuit, Robert M Havey, Leonard I Voronov, Alexander J Ghanayem, Avinash G Patwardhan
Background: Forward Head Posture (FHP) may be associated with neck pain and poor health-related quality of life. Literature describes only qualitative muscle length changes associated with FHP. Objective: To quantify how muscle-tendon unit lengths are altered when human cadaveric specimens are placed in alignments representing different severities of FHP. Design: Biomechanical study using 13 fresh-frozen cadaveric cervical spine specimens (Occiput-T1, 54±15yrs)...
April 21, 2017: Physical Therapy
https://www.readbyqxmd.com/read/28427722/biomechanical-investigation-of-post-operative-c5-palsy-due-to-ossification-of-the-posterior-longitudinal-ligament-in-different-types-of-cervical-spinal-alignment
#2
Batbayar Khuyagbaatar, Kyungsoo Kim, Won Man Park, Yoon Hyuk Kim
Post-operative C5palsies are among the most common complications seen after cervical surgery for ossification of the posterior longitudinal ligament (OPLL). Although C5 palsy is a well-known complication of cervical spine surgery, its pathogenesis is poorly understood and depends on many other factors. In this study, a finite element model of the cervical spine and spinal cord-nerve roots complex structures was developed. The changes in stress in the cord and nerve roots, posterior shift of the spinal cord, and displacement and elongation of the nerve roots after laminectomy for cervical OPLL were analyzed for three different cervical sagittal alignments (lordosis, straight, and kyphosis)...
April 5, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28422889/an-in-vitro-biomechanical-evaluation-of-an-expansive-double-threaded-bi-directional-compression-screw-for-fixation-of-type-ii-odontoid-process-fractures-a-squire-compliant-article
#3
Ning Liu, Li Tian, Rong-Xian Jiang, Chao Xu, Lei Shi, Wei Lei, Yang Zhang
Odontoid process fracture accounts for 5% to 15% of all cervical spine injuries, and the rate is higher among elderly people. The anterior cannulated screw fixation has been widely used in odontoid process fracture, but the fixation strength may still be limited under some circumstances. This study aims to investigate the biomechanical fixation strength of expansive double-threaded bi-directional compression screw (EDBCS) compared with cannulated lag screw (CLS) and improved Herbert screw (IHS) for fixation of type II odontoid process fracture...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28408260/evaluation-of-bioabsorbable-multiamino-acid-copolymer-nano-hydroxyapatite-calcium-sulphate-cage-in-a-goat-spine-model
#4
Chunpeng Ren, Yueming Song, Youdi Xue, Xi Yang, Chunguang Zhou
BACKGROUND: Recently, polylactide is the most popular material used to made bioabsorbable cages, but too fast degradation and osteolysis around the cage have been reported in the literature. This study evaluated the fusion effect, biomechanical stability and histological characteristics of a novel bioabsorbable multi-amino acid copolymer/nano-hydroxyapatite/calcium sulphate (MAACP/n-HA/CS) interbody cage in a goat model of anterior cervical discectomy and fusion (ACDF). METHODS: A total of 24 goats underwent C3/C4 discectomy and fusion with three groups of intervertebral implants: MAACP/n-HA/CS cage group (n = 8), titanium cage group (n = 8) and autologous tricortical iliac crest bone group (n = 8)...
April 10, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28399553/rectus-capitis-posterior-minor-histological-and-biomechanical-links-to-the-spinal-dura-mater
#5
Gabriel Venne, Brian J Rasquinha, Manuela Kunz, Randy E Ellis
STUDY DESIGN: Serial histological investigation was performed on 10 cadaveric specimens and biomechanical tests were performed on five specimens, both focused on the tissue connexion between the rectus capitis posterior minor (RCPMi) and the spinal dura. OBJECTIVE: This study had two components: to clarify the microscopic structure of the tissue link between RCPMi and the dura mater, and to evaluate the mechanical role of this tissue complex. SUMMARY OF BACKGROUND DATA: Dissection-based and imaging-based reports have suggested a connective tissue link between the RCPMi and the dura mater at the posterior-atlanto-occipital (PAO) level...
April 15, 2017: Spine
https://www.readbyqxmd.com/read/28388735/a-novel-anterior-trans-pedicular-screw-artificial-vertebral-body-system-for-lower-cervical-spine-fixation-a-finite-element-study
#6
Weidong Wu, Chun Chen, Jinpei Ning, Pei-Dong Sun, Jinyuan Zhang, Changfu Wu, Zhenyu Bi, Jihong Fan, Xianliang Lai, Jun Ouyang
Objective A finite element model was used to compare the biomechanical properties of a novel anterior trans-pedicular screw artificial vertebral body system (AVBS) with a conventional anterior screw plate system (ASPS) for fixation in the lower cervical spine. Methods A model of the intact cervical spine (C3-C7) was established. AVBS or ASPS constructs were implanted between C4 and C6. The models were loaded in three-dimensional motion. The Von Mises stress distribution in the internal fixators was evaluated, as well as the range of motion (ROM) and facet joint force...
April 7, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28378964/musculo-skeletal-and-pulmonary-effects-of-sitting-position-a-systematic-review
#7
REVIEW
Elżbieta Szczygieł, Katarzyna Zielonka, Sylwia Mętel, Joanna Golec
INTRODUCTION: Year after year, we spend an increasing amount of time in a sitting position. Often, we sit with poor posture, as indicated by numerous pain syndromes within the musculoskeletal system. Several reports confirm that body posture and the amount of time spent in a seated position have extensive implications for our health. Previous studies and a literature review suggest there is limited knowledge regarding an ergonomic sitting position. OBJECTIVE: The aim of the study was to analyze the research relating to a proper sitting position and the consequences of incorrect sitting posture...
March 31, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/28368985/prediction-of-cervical-spinal-joint-loading-and-secondary-motion-using-a-musculoskeletal-multibody-dynamics-model-via-force-dependent-kinematics-approach
#8
Hao Diao, Hua Xin, Jun Dong, Xijing He, Dichen Li, Zhongmin Jin
STUDY DESIGN: A cervical spine biomechanical investigation using multibody dynamics. OBJECTIVE: To develop a comprehensive cervical spine multibody dynamics model incorporated with the force-dependent kinematics (FDK) approach, and to study the influence of soft tissue deformation on the joint loading prediction. SUMMARY OF BACKGROUND DATA: Musculoskeletal multibody dynamics models have been widely used to analyze joint loading. Current cervical spine musculoskeletal models, however, neglect the joint internal motion caused by soft tissue deformation...
March 31, 2017: Spine
https://www.readbyqxmd.com/read/28337729/adjacent-level-disease-background-and-update-based-on-disc-replacement-data
#9
REVIEW
I David Kaye, Alan S Hilibrand
PURPOSE OF REVIEW: The precise etiology of adjacent segment disease following cervical spine surgery is controversial. Theories for development include inevitable changes secondary to the natural progression of the degenerative cascade and changes secondary to altered biomechanics of the fused cervical spine. Motion preserving techniques, such as cervical disc arthroplasties (CDA), have been introduced with the hopes of reducing the rates of adjacent segment pathology. Recently, 7-year data from the investigational device exemption (IDE) studies have been published...
March 23, 2017: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/28334406/male-and-female-cervical-spine-biomechanics-and-anatomy-implication-for-scaling-injury-criteria
#10
Narayan Yoganandan, Cameron R Bass, Liming Voo, Frank A Pintar
There is an increased need to develop female-specific injury criteria and anthropomorphic test devices (dummies) for military and automotive environments, especially as women take occupational roles traditionally reserved for men. Although some exhaustive reviews on the biomechanics and injuries of the human spine have appeared in clinical and bioengineering literatures, focus has been largely ignored on the difference between male and female cervical spine responses and characteristics. Current neck injury criteria for automotive dummies for assessing crashworthiness and occupant safety are obtained from animal and human cadaver experiments, computational modeling, and human volunteer studies...
May 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28334358/ranges-of-cervical-intervertebral-disc-deformation-during-an-in-vivo-dynamic-flexion-extension-of-the-neck
#11
Yan Yu, Haiqing Mao, Jing-Sheng Li, Tsung-Yuan Tsai, Liming Cheng, Kirkham B Wood, Guoan Li, Thomas D Cha
While abnormal loading is widely believed to cause cervical spine disc diseases, in vivo cervical disc deformation during dynamic neck motion has not been well delineated. This study investigated the range of cervical disc deformation during an in vivo functional flexion-extension of the neck. Ten asymptomatic human subjects were tested using a combined dual fluoroscopic imaging system (DFIS) and magnetic resonance imaging (MRI)-based three-dimensional (3D) modeling technique. Overall disc deformation was determined using the changes of the space geometry between upper and lower endplates of each intervertebral segment (C3/4, C4/5, C5/6, and C6/7)...
June 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28323697/generation-and-development-of-paravertebral-ossification-in-cervical-artificial-disk-replacement-a-detailed-analytic-report-using-coronal-reconstruction-ct
#12
Wei Tian, Xiao Han, Bo Liu, Da He, Yanwei Lv, James Yue
STUDY DESIGN: A retrospective follow-up study and review of images in published papers. OBJECTIVE: To determine whether true heterotopic ossification (HO) occurs in artificial disk replacement (ADR); to evaluate the incidence of paravertebral ossification (PO) and its influence on ADR. SUMMARY OF BACKGROUND DATA: HO is typically defined as the abnormal formation of true bone within extraskeletal soft tissues. However, HO in ADR does not fit this definition precisely, as it originates from vertebral body, making it hard to distinguish radiologically from preexisting osteophytes...
April 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28250641/traumatic-high-grade-spondylolisthesis-at-c7-t1-with-no-neurological-deficits-case-series-literature-review-and-biomechanical-implications
#13
Ha Son Nguyen, Hesham Soliman, Shekar Kurpad
Traumatic high-grade spondylolisthesis in subaxial cervical spine is frequently associated with acute spinal cord injury and quadriparesis. There have been rare cases where such pathology demonstrates minimal to no neurological deficits. Assessment of the underlying biomechanics may provide insight into the mechanism of injury and associated neurological preservation. Patient 1 is a 63-year-old female presenting after a motor vehicle collision with significant right arm pain without neurological deficits. Imaging demonstrated C7/T1 spondyloptosis, associated with a locked facet on the left at C6/7 and a locked facet on the right at C7/T1, with a fracture of the left C7 pedicle and right C7 lamina...
January 2017: Journal of Craniovertebral Junction and Spine
https://www.readbyqxmd.com/read/28243363/a-novel-patient-specific-drill-guide-template-for-pedicle-screw-insertion-into-the-subaxial-cervical-spine-utilizing-stereolithographic-modelling-an-in-vitro-study
#14
Rafael Cruz Bundoc, Giorgio De Guzman Delgado, Samuel Arsenio Munoz Grozman
STUDY DESIGN: Cadaveric study. PURPOSE: The purpose of this study was to assess the accuracy and feasibility of cervical pedicle screw (CPS) insertion into the subaxial cervical spine placed using a patient-specific drill guide template constructed from a stereolithographic model. OVERVIEW OF LITERATURE: CPS fixation is an invaluable tool for posterior cervical fixation because of its biomechanical advantages. The major drawback is its narrow corridor that allows very little clearance for neural and vascular injuries...
February 2017: Asian Spine Journal
https://www.readbyqxmd.com/read/28171773/cervical-traction-therapy-with-and-without-neck-support-a-finite-element-analysis
#15
Kuan Wang, Huihao Wang, Zhen Deng, Zhengyan Li, Hongsheng Zhan, Wenxin Niu
BACKGROUND: Cervical traction is commonly used for treating neck pain. However, few studies have investigated the biomechanical impact such traction has on soft tissues. OBJECTIVES: To analyze the biomechanics of cervical traction therapy in a supine position with and without neck support (NS and non-NS). METHODS: A finite element model of the cervical spine was constructed to investigate the mechanism behind cervical traction therapy. An axial traction force of 100-N was loaded on the upper surface of C0 to simulate traction weight...
April 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28155678/compression-distraction-reduction-surgical-verification-and-optimization-to-treat-the-basilar-invagination-and-atlantoaxial-dislocation-a-finite-element-analysis
#16
Xuefeng Bo, Weida Wang, Zan Chen, Zhicheng Liu
BACKGROUND: Basilar invagination (BI) combined with atlantoaxial dislocation (AAD) leads to foramen magnum stenosis and medullary spinal cord compression, causing nerve dysfunction. The purpose of the surgery is to remove the bony compression at brainstem ventral side and fix the unstable spinal segment and make it fused stably. Occipital cervical internal fixation system that simultaneously reduces atlantoaxial horizontal and vertical dislocation are established. We propose here a new compression-distraction reduction (CDR) technique...
December 28, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28153123/temporomandibular-disorders-and-painful-comorbidities-clinical-association-and-underlying-mechanisms
#17
Yuri Martins Costa, Paulo César Rodrigues Conti, Flavio Augusto Cardoso de Faria, Leonardo Rigoldi Bonjardim
The association between temporomandibular disorders (TMDs) and headaches, cervical spine dysfunction, and fibromyalgia is not artefactual. The aim of this review is to describe the comorbid relationship between TMD and these three major painful conditions and to discuss the clinical implications and the underlying pain mechanisms involved in these relationships. Common neuronal pathways and central sensitization processes are acknowledged as the main factors for the association between TMD and primary headaches, although the establishment of cause-effect mechanisms requires further clarification and characterization...
March 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28146029/kinematics-of-the-cervical-spine-following-unilateral-facet-fracture-an-in-vitro-cadaver-study
#18
Paolo Caravaggi, Linda Chen, Linda Uko, Andres Zorrilla, Spencer Hauser, Michael J Vives
STUDY DESIGN: Biomechanical study utilizing human cadaveric cervical spines. OBJECTIVE: To quantitatively assess the effects on intervertebral motion of isolated unilateral cervical facet fracture, and after disruption of the intervertebral disc at the same level. SUMMARY OF BACKGROUND DATA: Clinical evidence has indirectly suggested that cervical facet fractures involving 40% of the height of the lateral mass can cause instability of the involved segment...
January 31, 2017: Spine
https://www.readbyqxmd.com/read/28108780/cement-augmented-screws-in-a-cervical-two-level-corpectomy-with-anterior-titanium-mesh-cage-reconstruction-a-biomechanical-study
#19
Sebastian Hartmann, Claudius Thomé, Anja Tschugg, Johannes Paesold, Pujan Kavakebi, Werner Schmölz
STUDY DESIGN: Biomechanical investigation. PURPOSE: Cervical two-level corpectomies with anterior-only instrumentation are associated with a high rate of implant-related complications. These procedures, therefore, often require an additional dorsal instrumentation to prevent screw loosening. Cement augmentation of the anterior screws in two-level corpectomies might stabilize the construct, so that a second dorsal procedure could be avoided. To evaluate the screw anchorage in cervical anterior-only procedures, an ex vivo evaluation of the range of motion (ROM) in two-level corpectomies (C4 and C5), with and without cement augmentation of the anterior screws, was carried out in this study...
January 21, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28107242/an-in-vitro-biomechanical-study-evaluating-cervical-extension-plates-for-stabilizing-degenerated-adjacent-levels
#20
Kamran Majid, Mark Moldavsky, Saif Khalil, Manasa Gudipally
STUDY DESIGN: To evaluate the biomechanical stability of 2 extender plates in a human cervical cadaveric model. OBJECTIVES: To evaluate 2 extender plates, placed adjacent to initially implanted plates and to compare their biomechanical stability with traditional techniques. SUMMARY OF BACKGROUND DATA: Traditionally, adjacent level degeneration is surgically treated by removing the previously implanted plate and extending the instrumentation to the new degenerated level...
February 2017: Clinical Spine Surgery
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