keyword
MENU ▼
Read by QxMD icon Read
search

Cervical axial rotation

keyword
https://www.readbyqxmd.com/read/28501956/an-in-vitro-evaluation-of-sagittal-alignment-in-the-cervical-spine-after-insertion-of-supraphysiologic-lordotic-implants
#1
Donald J Blaskiewicz, Jeffrey E Harris, Patrick P Han, Alexander W Turner, Gregory M Mundis
PURPOSE: Cervical spine malalignment can develop as a consequence of degenerative disc disease or following spinal surgery. When normal sagittal alignment of the spine is disrupted, further degeneration may occur adjacent to the deformity. The purpose of this study was to investigate changes in lordosis and sagittal alignment in the cervical spine after insertion of supraphysiologic lordotic implants. METHODS: Eight cadaveric cervical spines (Occiput-T1) were tested...
May 13, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28418508/lower-cervical-spine-motion-segment-computational-model-validation-kinematic-and-kinetic-response-for-quasi-static-and-dynamic-loading
#2
Jeffrey B Barker, Duane S Cronin, Roger W Nightingale
Advanced computational human body models (HBM) enabling enhanced safety require verification and validation at different levels or scales. Specifically, the motion segments, which are the building blocks of a detailed neck model, must be validated with representative experimental data to have confidence in segment and, ultimately, full neck model response. In this study, we introduce detailed finite element motion segment models and assess the models for quasi-static and dynamic loading scenarios. Finite element segment models at all levels in the lower human cervical spine were developed from scans of a 26-yr old male subject...
June 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28378073/kinematics-of-cervical-segments-c5-c6-in-axial-rotation-before-and-after-total-disc-arthroplasty
#3
Martin Michael Wachowski, Jan Weiland, Markus Wagner, Riccardo Gezzi, Dietmar Kubein-Meesenburg, Hans Nägerl
PURPOSE: The kinematical properties of C5/C6 segments in axial rotation are evaluated before and after total disc arthroplasty (TDA) with PRESTIGE(®)-and BRYAN(®) Cervical Disc (Medtronic) under flexion/extension as parameters and compared with those of C3/C4. METHODS: Eight human segments were stimulated by triangularly varying, axially directed torque (T z(t)) under compressing static axial preloads. Using a 6D-measuring device with high resolution, the response of segmental motion was characterized by the instantaneous helical axis (IHA)...
April 4, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28370000/radiographic-and-computed-tomographic-appearance-of-tracheal-collapse-with-axial-rotation-in-four-dogs
#4
H G Heng, C K Lim, B Gutierrez-Crespo, L F Guptill
Tracheal collapse with axial rotation was diagnosed in four dogs. Radiographs showed increased tracheal dorsoventral height at the caudal cervical and thoracic inlet with and apparent intraluminal soft tissue opacity, mimicking an intraluminal tracheal foreign body. Computed tomography confirmed dorsoventral tracheal collapse with axial rotation in all dogs. Short-term outcome with medical treatment of all dogs was excellent.
April 3, 2017: Journal of Small Animal Practice
https://www.readbyqxmd.com/read/28343254/dynamic-measurements-of-cervical-neural-foramina-during-neck-movements-in-asymptomatic-young-volunteers
#5
Victor Chang, Azam Basheer, Timothy Baumer, Daniel Oravec, Colin P McDonald, Michael J Bey, Stephen Bartol, Yener N Yeni
PURPOSE: Neural foraminal dimensions are considered important in nerve root compression and development of cervical radiculopathy, but baseline data regarding their range during normal motion are not available. An in vivo study of cervical foraminal motion was conducted to characterize normal 3D dynamic foraminal dimensions during physiological neck motion and compare between different tasks and intervertebral segments. METHODS: Biplane X-ray imaging and computed tomography-based markerless tracking were used to measure foraminal height (FH) and width (FW) from five asymptomatic subjects during neck axial rotation and extension...
March 25, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28340590/comparison-of-angle-shape-and-position-of-articular-processes-in-dobermans-and-great-danes-with-and-without-cervical-spondylomyelopathy
#6
Marília de Albuquerque Bonelli, Ronaldo Casimiro da Costa, Paula Martin-Vaquero, Carolina Gonçalves Dias Lima
BACKGROUND: Cervical spondylomyelopathy (CSM), also known as wobbler syndrome, affects mainly large and giant-breed dogs, causing compression of the cervical spinal cord and/or nerve roots. Structural and dynamic components seem to play a role in the development of CSM; however, pathogenesis is not yet fully understood. Physiologic and pathologic movements of the cervical spine depend on the morphology and morphometry of articular processes, as well as on intervertebral discs and vertebral column ligaments...
March 24, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28340364/cervical-facet-force-analysis-after-disc-replacement-versus-fusion
#7
Vikas V Patel, Zachary R Wuthrich, Kirk C McGilvray, Matthew C Lafleur, Emily M Lindley, Derrick Sun, Christian M Puttlitz
BACKGROUND: Cervical total disc replacement was developed to preserve motion and reduce adjacent-level degeneration relative to fusion, yet concerns remain that total disc replacement will lead to altered facet joint loading and long-term facet joint arthrosis. This study is intended to evaluate changes in facet contact force, pressure and surface area at the treated and superior adjacent levels before and after discectomy, disc replacement, and fusion. METHODS: Ten fresh-frozen human cadaveric cervical spines were potted from C2 to C7 with pressure sensors placed into the facet joints of C3-C4 and C4-C5 via slits in the facet capsules...
May 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28324213/-split-and-splayed-c3-traumatic-lateral-c2-3-dislocation-without-neurological-deficits-unique-case-and-its-management
#8
Apinderpreeet Singh, Pravin Salunke, Rajeev P Kamble
BACKGROUND: Traumatic C2-3 dislocation has been often described in the antero-posterior plane but is extremely rare in the lateral plane. Such dislocations have been described in thoraco-lumbar and C1-2. The need to study the imaging in multiple planes has been highlighted to plan proper realignment. METHODS: A young male presented with neck pain alone following a train accident. The imaging showed a fracture of C3 splaying it. The C2-3 showed lateral dislocation in the lateral plane with locked C2-3 facets on one side and C3-4 facets on the other...
March 21, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28157621/analysis-of-the-upper-cervical-spine-stiffness-during-axial-rotation-a-comparative-study-among-patients-with-tension-type-headache-or-migraine-and-asymptomatic-subjects
#9
P-M Dugailly, A Decuyper, W Salem, A De Boe, G V Espí-López, Y Lepers
BACKGROUND: Many studies reported the implication of the cervical musculoskeletal system in patients with tension type headache and migraine. The objective of this study is to investigate the upper cervical spine stiffness features in axial rotation among headache patients in comparison with a healthy population. METHODS: 48 subjects including 30 migraine patients with/without aura and 18 patients with tension-type headache, aged between 18 and 60years (mean 36, SD 11years) have been evaluated...
January 27, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28146029/kinematics-of-the-cervical-spine-following-unilateral-facet-fracture-an-in-vitro-cadaver-study
#10
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/28144582/reliability-and-concurrent-validity-of-postural-asymmetry-measurement-in-adolescent-idiopathic-scoliosis
#11
Ashleigh Prowse, Berit Aslaksen, Marie Kierkegaard, James Furness, Paul Gerdhem, Allan Abbott
AIM: To investigate the reliability and concurrent validity of the Baseline(®) Body Level/Scoliosis meter for adolescent idiopathic scoliosis postural assessment in three anatomical planes. METHODS: This is an observational reliability and concurrent validity study of adolescent referrals to the Orthopaedic department for scoliosis screening at Karolinska University Hospital, Stockholm, Sweden between March-May 2012. A total of 31 adolescents with idiopathic scoliosis (13...
January 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28126422/three-dimensional-intervertebral-range-of-motion-in-the-cervical-spine-does-the-method-of-calculation-matter
#12
William J Anderst, Yashar Aucie
Intervertebral range of motion (ROM) is commonly calculated using ordered rotations or projection angles. Ordered rotations are sequence-dependent, and projection angles are dependent upon on which orientation vectors are projected. This study assessed the effect of calculation method on intervertebral ROM in the subaxial cervical spine (C3-C7) during in vivo dynamic, three-dimensional, functional movement. Biplane radiographs were collected at 30 images per second while 29 participants performed full ROM flexion/extension, axial rotation and lateral bending movements of their cervical spine...
January 23, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28107242/an-in-vitro-biomechanical-study-evaluating-cervical-extension-plates-for-stabilizing-degenerated-adjacent-levels
#13
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
https://www.readbyqxmd.com/read/28095101/an-immediate-effect-of-axial-neck-rotation-training-with-real-time-visual-feedback-using-a-smartphone-inclinometer-on-improvement-in-axial-neck-rotation-function
#14
Kyue-Nam Park, Oh-Yun Kwon, Si-Hyun Kim, In-Cheol Jeon
OBJECTIVES: The purpose of this study was to compare the immediate effects of axial neck rotation training (Axi-NRT) with and without real-time visual feedback (VF) using a smartphone inclinometer on the range of motion (ROM) for axial neck rotation and the onset of compensatory neck lateral bending and extension during active neck rotation. METHODS: Twenty participants with restricted ROM for neck rotation but no neck pain (21.1 ± 1.6 years and 8 males, 12 females) were recruited for Axi-NRT with VF, and twenty age- and gender-matched participants with restricted ROM for neck rotation were recruited for Axi-NRT without VF...
March 2017: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/27888081/bow-hunter-s-syndrome-from-a-tortuous-v1-segment-vertebral-artery-treated-with-stent-placement
#15
Rouzbeh Motiei-Langroudi, Christoph J Griessenauer, Abdulrahman Alturki, Nimer Adeeb, Ajith J Thomas, Christopher S Ogilvy
BACKGROUND: Bow hunter's syndrome is a dynamic and reversible occlusion of the vertebral artery occurring after rotation or extension of the neck. The V3 segment is the most common site of compression, especially at the atlantoaxial joint. Surgical decompression with or without cervical fusion has been the mainstay of therapy. Endovascular intervention, such as placement of stents, is rarely performed. METHODS: We report a patient with bow hunter's syndrome from tortuosity of the V1 segment of the VA treated with a self-expanding biliary stent placement...
February 2017: World Neurosurgery
https://www.readbyqxmd.com/read/27875411/comparing-the-effectiveness-of-sagittal-balance-foraminal-stenosis-and-preoperative-cord-rotation-in-predicting-postoperative-c5-palsy
#16
Arunit J S Chugh, Douglas S Weinberg, Fernando Alonso, Jason D Eubanks
STUDY DESIGN: Retrospective cohort review. OBJECTIVE: To determine whether preoperative cord rotation is independently correlated with C5 palsy when analyzed alongside measures of sagittal balance and foraminal stenosis. SUMMARY OF BACKGROUND DATA: Postoperative C5 palsy is a well-documented complication of cervical procedures with a prevalence of 4%-8%. Recent studies have shown a correlation with preoperative spinal cord rotation. There have been few studies, however, that have examined the role of sagittal balance and foraminal stenosis in the development of C5 palsy...
November 21, 2016: Clinical Spine Surgery
https://www.readbyqxmd.com/read/27831986/longitudinal-study-of-the-six-degrees-of-freedom-cervical-spine-range-of-motion-during-dynamic-flexion-extension-and-rotation-after-single-level-anterior-arthrodesis
#17
William J Anderst, Tyler West, William F Donaldson, Joon Y Lee, James D Kang
STUDY DESIGN: A longitudinal study using biplane radiography to measure in vivo intervertebral range of motion (ROM) during dynamic flexion/extension, and rotation. OBJECTIVE: To longitudinally compare intervertebral maximal ROM and midrange motion in asymptomatic control subjects and single-level arthrodesis patients. SUMMARY OF BACKGROUND DATA: In vitro studies consistently report that adjacent segment maximal ROM increases superior and inferior to cervical arthrodesis...
November 15, 2016: Spine
https://www.readbyqxmd.com/read/27805449/biomechanical-assessment-of-the-effects-of-vertebral-distraction-fusion-techniques-on-the-adjacent-segment-of-canine-cervical-vertebrae
#18
Takaharu Hakozaki, Tomu Ichinohe, Nobuo Kanno, Takuya Yogo, Yasuji Harada, Tadashi Inaba, Yuichi Kasai, Yasushi Hara
OBJECTIVE To assess effects of vertebral distraction-fusion techniques at a treated segment (C5-C6) and an adjacent segment (C4-C5) of canine cervical vertebrae. SAMPLE Cervical vertebrae harvested from cadavers of 10 skeletally mature Beagles. PROCEDURES Three models (intact, titanium plate, and polymethylmethacrylate [PM MA]) for stabilization of the caudal region of the cervical vertebrae (C4 through C7) were applied to the C5-C6 vertebral segment sequentially on the same specimens. Biomechanical assessments with flexion-extension, lateral bending, and axial rotational tests were conducted after each procedure...
November 2016: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/27627721/can-an-endplate-conformed-cervical-cage-provide-a-better-biomechanical-environment-than-a-typical-non-conformed-cage-a-finite-element-model-and-cadaver-study
#19
Fan Zhang, Hao-Cheng Xu, Bo Yin, Xin-Lei Xia, Xiao-Sheng Ma, Hong-Li Wang, Jun Yin, Ming-Hao Shao, Fei-Zhou Lyu, Jian-Yuan Jiang
OBJECTIVES: To evaluate the biomechanical characteristics of endplate-conformed cervical cages by finite element method (FEM) analysis and cadaver study. METHODS: Twelve specimens (C2 -C7 ) and a finite element model (C3 -C7 ) were subjected to biomechanical evaluations. In the cadaver study, specimens were randomly assigned to intact (I), endplate-conformed (C) and non-conformed (N) groups with C4-5 discs as the treated segments. The morphologies of the endplate-conformed cages were individualized according to CT images of group C and the cages fabricated with a 3-D printer...
August 2016: Orthopaedic Surgery
https://www.readbyqxmd.com/read/27609452/bilateral-subaxial-rotational-vertebral-artery-occlusion-in-a-setting-of-a-prior-cervical-construct
#20
Daniel R Felbaum, Joshua E Ryan, Andrew B Stemer, Amjad N Anaizi
BACKGROUND: Rotational vertebral artery occlusion, or bow hunter's syndrome, most commonly affects the C1-2 level because of its importance in regulating rotational movement. CASE DESCRIPTION: A 50-year-old man with increasing neck pain and severe symptoms of vertebrobasilar insufficiency with bidirectional head rotation had undergone several prior subaxial cervical spine operations. Dynamic cerebral angiography demonstrated complete occlusion of the left vertebral artery during head rotation to the right and complete occlusion of the right vertebral artery during head rotation to the left...
January 2017: World Neurosurgery
keyword
keyword
16040
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"