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Cervical axial rotation

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https://www.readbyqxmd.com/read/28340364/cervical-facet-force-analysis-after-disc-replacement-versus-fusion
#1
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...
March 18, 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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
https://www.readbyqxmd.com/read/27606262/validation-of-attitude-and-heading-reference-system-and-microsoft-kinect-for-continuous-measurement-of-cervical-range-of-motion-compared-to-the-optical-motion-capture-system
#15
Young Seop Song, Kyung Yong Yang, Kibum Youn, Chiyul Yoon, Jiwoon Yeom, Hyeoncheol Hwang, Jehee Lee, Keewon Kim
OBJECTIVE: To compare optical motion capture system (MoCap), attitude and heading reference system (AHRS) sensor, and Microsoft Kinect for the continuous measurement of cervical range of motion (ROM). METHODS: Fifteen healthy adult subjects were asked to sit in front of the Kinect camera with optical markers and AHRS sensors attached to the body in a room equipped with optical motion capture camera. Subjects were instructed to independently perform axial rotation followed by flexion/extension and lateral bending...
August 2016: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/27601934/biomechanical-evaluation-of-dtrax-%C3%A2-posterior-cervical-cage-stabilization-with-and-without-lateral-mass-fixation
#16
Leonard I Voronov, Krzysztof B Siemionow, Robert M Havey, Gerard Carandang, Avinash G Patwardhan
INTRODUCTION: Lateral mass screw (LMS) fixation with plates or rods is the current standard procedure for posterior cervical fusion. Recently, implants placed between the facet joints have become available as an alternative to LMS or transfacet screws for patients with cervical spondylotic radiculopathy. The purpose of this study was to evaluate the biomechanical stability of the DTRAX(®) cervical cage for single- and two-level fusion and compare this to the stability achieved with LMS fixation with rods in a two-level construct...
2016: Medical Devices: Evidence and Research
https://www.readbyqxmd.com/read/27572240/clinically-relevant-variations-of-the-superior-thyroid-cornu
#17
Thomas Shiozawa, P Epe, S Herlan, M Müller, A Tropitzsch, I Tsiflikas, B Hirt
PURPOSE: The superior thyroid cornu (STC) of the thyroid cartilage is a variable structure that maybe associated with different clinical symptoms. This study evaluates the three-dimensional anatomy of the STC. METHODS: Measurements were conducted on 97 CT scans (45 male and 52 female). The protocol models a vector from the base to the tip of the STC and references the cornu to the midline. From these data, the length (C), the rotation angle (γ), the inclination angle (β), and the deviation of STC base (X 2) and tip (X 3) from the midline were measured...
August 29, 2016: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/27504131/potential-role-of-trans-cervical-endosonography-trace-in-brachytherapy-of-cervical-cancer-proof-of-concept
#18
Primoz Petric, Christian Kirisits
PURPOSE: Magnetic resonance imaging (MRI) is the gold standard for image guided adaptive brachytherapy (BT) of cervical cancer. Ultrasound is an attractive alternative with reasonable costs and high soft tissue depiction quality. This technical note aims to demonstrate the proof of principle for use of TRAns Cervical Endosonography with rotating transducer in the context of brachytherapy (TRACE BT). MATERIAL AND METHODS: TRACE BT presentation is based on a single stage IIB cervical cancer patient...
June 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/27471414/bilateral-posterior-cervical-cages-provide-biomechanical-stability-assessment-of-stand-alone-and-supplemental-fixation-for-anterior-cervical-discectomy-and-fusion
#19
Leonard I Voronov, Krzysztof B Siemionow, Robert M Havey, Gerard Carandang, Frank M Phillips, Avinash G Patwardhan
INTRODUCTION: Supplemental posterior instrumentation has been widely used to enhance stability and improve fusion rates in higher risk patients undergoing anterior cervical discectomy and fusion (ACDF). These typically involve posterior lateral mass or pedicle screw fixation with significant inherent risks and morbidities. More recently, cervical cages placed bilaterally between the facet joints (posterior cervical cages) have been used as a less disruptive alternative for posterior fixation...
2016: Medical Devices: Evidence and Research
https://www.readbyqxmd.com/read/27457429/resection-or-degeneration-of-uncovertebral-joints-altered-the-segmental-kinematics-and-load-sharing-pattern-of-subaxial-cervical-spine-a-biomechanical-investigation-using-a-c2-t1-finite-element-model
#20
Zhong Wang, Hui Zhao, Ji-Ming Liu, Li-Wen Tan, Peng Liu, Jian-Hua Zhao
The uncovertebral joint (UJ) is an important load-bearing structure in the subaxial cervical spine (SCS) and the medial wall of the intervertebral foramen (IVF). To investigate the UJ׳s role in load distribution and transmission under physiological loading, we developed and validated a detailed finite element model (C2-T1). Based on the initial model, two additional models were modified to simulate surgical resection and degeneration of UJs, to evaluate their influence on SCS kinematics and load distribution...
September 6, 2016: Journal of Biomechanics
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