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Reconstruction of the. Spine

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https://www.readbyqxmd.com/read/28098744/trabecular-microstructure-and-damage-affect-cement-leakage-from-the-basivertebral-foramen-during-vertebral-augmentation
#1
Shengyun Li, Chongyan Wang, Zhi Shan, Junhui Liu, Tianming Yu, Xuyang Zhang, Shunwu Fan, Blaine A Christiansen, Wenyuan Ding, Fengdong Zhao
STUDY DESIGN: A prospective study on cadaver specimens. OBJECTIVE: To explore why cement leakage from BF easily occurs during vertebral augmentation procedures. SUMMARY OF BACKGROUND DATA: Type B (through BF, basivertebral foramen) cement leakage is the most common type after vertebral augmentation, but the mechanism of this is still controversial. The contribution of vertebral trabecular bone orientation and trabecular damage during compression fracture to cement leakage is still unknown...
January 16, 2017: Spine
https://www.readbyqxmd.com/read/28092739/an-emg-driven-biomechanical-model-of-the-canine-cervical-spine
#2
M Alizadeh, G G Knapik, J S Dufour, C Zindl, M J Allen, J Bertran, N Fitzpatrick, W S Marras
Due to the frequency of cervical spine injuries in canines, the purpose of this effort was to develop an EMG-driven dynamic model of the canine cervical spine to assess a biomechanical understanding that enables one to investigate the risk of neck disorders. A canine subject was recruited in this investigation in order to collect subject specific data. Reflective markers and a motion capture system were used for kinematic measurement; surface electrodes were used to record electromyography signals, and with the aid of force plate kinetics were recorded...
December 26, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28092341/unilateral-spinous-process-non-covering-hook-type-patient-specific-drill-template-for-thoracic-pedicle-screw-fixation-a-pilot-clinical-trial-and-template-classification
#3
Sang Bum Kim, Yougun Won, Hyun Jin Yoo, Lee Jae Sin, John M Rhee, Sang Wook Lee, Gi-Soo Lee
STUDY DESIGN: Prospective Clinical Pilot tudy OBJECTIVE.: To confirm the accuracy of thoracic pedicle screw placement by using the unilateral spinous non-covering hook type patient-specific drill template (PSDT) made through rapid prototyping (RP) and to analyze previously reported PSDT designs and their characteristics. SUMMARY OF BACKGROUND DATA: Pedicle screw fixation is the most common form of the posterior instrumentation of the thoracic and lumbar spine. Various techniques have been introduced to improve pedicle screw placement...
January 13, 2017: Spine
https://www.readbyqxmd.com/read/28088217/surgical-treatment-of-upper-cervical-spine-metastases-a-retrospective-study-of-39-cases
#4
Jian Yang, Qi Jia, Dongyu Peng, Wei Wan, Nanzhe Zhong, Yan Lou, Xiaopan Cai, Zhipeng Wu, Chenglong Zhao, Xinghai Yang, Jianru Xiao
BACKGROUND: The surgical treatment of upper cervical spine metastases are controversial up to now. By summarizing and analyzing the clinical data of the upper cervical spine involved metastases treated surgically in our center, we mainly aimed to investigate the surgical decisions and outcomes so as to provide more references for the clinical treatment of this special and complex spine metastasis. METHODS: We evaluated the patients' pre- and post-operative neck pain and neurologic function with paired t test, followed by the statistics of the selection of surgical approaches, ways of reconstruction, and related complications...
January 14, 2017: World Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28087764/accumulation-of-polyribosomes-in-dendritic-spine-heads-but-not-bases-and-necks-during-memory-consolidation-depends-on-cap-dependent-translation-initiation
#5
Linnaea E Ostroff, Benjamin Botsford, Sofya Gindina, Kiriana K Cowansage, Joseph E LeDoux, Eric Klann, Charles Hoeffer
: Translation in dendrites is believed to support synaptic changes during memory consolidation. Although translational control mechanisms are fundamental mediators of memory, little is known about their role in local translation. We previously found that polyribosomes accumulate in dendritic spines of the adult rat lateral amygdala (LA) during consolidation of aversive Pavlovian conditioning, and that this memory requires cap-dependent initiation, a primary point of translational control in eukaryotic cells...
January 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28077871/hyoliths-are-palaeozoic-lophophorates
#6
Joseph Moysiuk, Martin R Smith, Jean-Bernard Caron
Hyoliths are abundant and globally distributed 'shelly' fossils that appear early in the Cambrian period and can be found throughout the 280 million year span of Palaeozoic strata. The ecological and evolutionary importance of this group has remained unresolved, largely because of their poorly constrained soft anatomy and idiosyncratic scleritome, which comprises an operculum, a conical shell and, in some taxa, a pair of lateral spines (helens). Since their first description over 175 years ago, hyoliths have most often been regarded as incertae sedis, related to molluscs or assigned to their own phylum...
January 19, 2017: Nature
https://www.readbyqxmd.com/read/28077713/reversible-disruption-of-neuronal-mitochondria-by-ischemic-and-traumatic-injury-revealed-by-quantitative-two-photon-imaging-in-the-neocortex-of-anesthetized-mice
#7
Mikhail Kislin, Jeremy Sword, Ioulia V Fomitcheva, Deborah Croom, Evgeny Pryazhnikov, Eero Lihavainen, Dmytro Toptunov, Heikki Rauvala, Andre S Ribeiro, Leonard Khiroug, Sergei A Kirov
: Mitochondria play a variety of functional roles in cortical neurons, from metabolic support and neuroprotection to the release of cytokines that trigger apoptosis. In dendrites, mitochondrial structure is closely linked to their function, and fragmentation (fission) of the normally elongated mitochondria indicates loss of their function under pathological conditions, such as stroke and brain trauma. Using in vivo two-photon microscopy in mouse brain, we quantified mitochondrial fragmentation in a full spectrum of cortical injuries, ranging from severe to mild...
January 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28062597/the-effect-of-susceptibility-artifacts-related-to-metal-implants-on-adjacent-lesion-assessment-in-simultaneous-tof-pet-mr
#8
Hanna Svirydenka, Gaspar Delso, Felipe DE Galiza Barbosa, Martin W Huellner, Helen Davison, Stefano Fanti, Patrick Veit-Haibach, Edwin Ter Voert
OBJECTIVE: Metal implants could affect the attenuation correction (AC) in positron emission tomography (PET)/magnetic resonance (MR) imaging. The purpose of this study is to evaluate the effect of susceptibility artifacts related to metal implants on adjacent metabolically active lesions in clinical simultaneous PET/MR scanning for both time-of-flight (TOF) and non-TOF reconstructed PET images. METHODS: We included 27 patients without implants, but with confirmed 2-deoxy-2-(18)F-fluoro-D-glucose ((18)F-FDG) avid lesions adjacent to common implant locations...
January 6, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28060533/morphological-distribution-of-the-anterior-inferior-iliac-spine-in-patients-with-and-without-hip-impingement
#9
George C Balazs, Benjamin C Williams, Christopher M Knaus, Daniel I Brooks, Jonathan F Dickens, Michael P McCabe, Terrence D Anderson
BACKGROUND: Subspinous impingement of the anterior inferior iliac spine (AIIS) on the femoral head-neck junction is increasingly recognized as a source of hip impingement. A classification system of AIIS morphology has previously been proposed that correlates with reduced hip motion and may predispose patients to subspinous hip impingement. PURPOSE: To examine the morphological distribution of AIIS types in patients with and without diagnosed hip impingement and correlate AIIS morphology to intraoperative findings at the time of surgery...
December 1, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28050814/what-orthopaedic-operating-room-surfaces-are-contaminated-with-bioburden-a-study-using-the-atp-bioluminescence-assay
#10
Raveesh Daniel Richard, Thomas R Bowen
BACKGROUND: Contaminated operating room surfaces can increase the risk of orthopaedic infections, particularly after procedures in which hardware implantation and instrumentation are used. The question arises as to how surgeons can measure surface cleanliness to detect increased levels of bioburden. This study aims to highlight the utility of adenosine triphosphate (ATP) bioluminescence technology as a novel technique in detecting the degree of contamination within the sterile operating room environment...
January 3, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28048770/su-g-jep1-05-clinical-impact-of-mlc-tracking-for-lung-sabr
#11
V Caillet, E Colvill, K Szymura, M Stevens, J Booth, P Keall
PURPOSE: The objective of this study was to investigate the dosimetric benefits of multi-leaf collimator (MLC) tracking for lung SABR treatments in end-to-end clinically realistic planning and delivery scenarios. METHODS: The clinical benefits of MLC tracking were assessed using previously delivered treatment plans and physical experiments. The 10 most recent single lesion lung SABR patients were re-planned following a 4D-GTV-based real-time adaptive protocol (PTV defined as the end-of-exhalation GTV plus 5...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048722/mo-fg-campus-iep2-05-feasibility-demonstration-of-high-voltage-clinical-ct-and-impact-on-x-ray-penetration-through-metal-objects
#12
Y Jin, V Robinson, L Gjesteby, G Wang, J Verburg, D Giantsoudi, H Paganetti, B De Man
PURPOSE: To demonstrate the possibility and quantify the impact of operating a clinical CT scanner at exceptionally high x-ray tube voltage for better penetration through metal objects and facilitating metal artifact reduction. METHODS: We categorize metal objects according to the data corruption severeness (level of distortion and complete photon starvation fraction). To demonstrate feasibility and investigate the impact of high voltage scanning we modified a commercial GE LightSpeed VCT scanner (generator and software) to enable CT scans with x-ray tube voltages as high as 175 kVp...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048046/su-f-j-74-high-z-geometric-integrity-and-beam-hardening-artifact-assessment-using-a-retrospective-metal-artifact-reduction-mar-reconstruction-algorithm
#13
K Woods, D DiCostanzo, N Gupta
PURPOSE: To test the efficacy of a retrospective metal artifact reduction (MAR) reconstruction algorithm for a commercial computed tomography (CT) scanner for radiation therapy purposes. METHODS: High Z geometric integrity and artifact reduction analysis was performed with three phantoms using General Electric's (GE) Discovery CT. The three phantoms included: a Computerized Imaging Reference Systems (CIRS) electron density phantom (Model 062) with a 6.5 mm diameter titanium rod insert, a custom spine phantom using Synthes Spine hardware submerged in water, and a dental phantom with various high Z fillings submerged in water...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28033285/migration-of-titanium-cable-into-spinal-cord-and-spontaneous-c2-and-c3-fusion-case-report-of-possible-causes-of-fatigue-failure-after-posterior-atlantoaxial-fixation
#14
Huibo Li, Jigang Lou, Hao Liu
INTRODUCTION: Atlantoaxial instability is a common and serious injury of the upper cervical spine. Brooks' procedure is widely used to reconstruct the unstable atlantoaxial joint. The migration into spinal cord of titanium cable and spontaneous fusion between C2 and C3 has been little reported and the management of such a patient is difficult. We describe an unusual case of fatigue failure of posterior titanium atlantoaxial cable fixation with migration into the spinal cord and spontaneous fusion between C2 and C3...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28031655/transperitoneal-intervascular-approach-for-repair-of-the-lumbar-spine
#15
Alexander M Geube, Anthony Rios, Janine A Tedesco, Gregg S Landis
This report describes a novel anterior surgical approach to the midlumbar spine. A transperitoneal dissection separating the tissue planes between the infrarenal vena cava and abdominal aorta allows for ample exposure in the reconstruction of midlumbar vertebral body fractures.
December 2016: International Journal of Angiology: Official Publication of the International College of Angiology, Inc
https://www.readbyqxmd.com/read/28025480/measurement-and-geometric-modelling-of-human-spine-posture-for-medical-rehabilitation-purposes-using-a-wearable-monitoring-system-based-on-inertial-sensors
#16
Gheorghe-Daniel Voinea, Silviu Butnariu, Gheorghe Mogan
This paper presents a mathematical model that can be used to virtually reconstruct the posture of the human spine. By using orientation angles from a wearable monitoring system based on inertial sensors, the model calculates and represents the curvature of the spine. Several hypotheses are taken into consideration to increase the model precision. An estimation of the postures that can be calculated is also presented. A non-invasive solution to identify the human back shape can help reducing the time needed for medical rehabilitation sessions...
December 22, 2016: Sensors
https://www.readbyqxmd.com/read/28025151/normative-3d-acetabular-orientation%C3%A2-measurements-by-the-low-dose-eos-imaging-system-in-102-asymptomatic-subjects-in-standing-position-analyses-by-side-gender-pelvic-incidence-and-reproducibility
#17
Thomas Thelen, Philippe Thelen, Hugues Demezon, Stephane Aunoble, Jean-Charles Le Huec
BACKGROUND: Three-dimensional (3D) acetabular orientation is a fundamental topic in orthopedic surgery. Computed tomography (CT) allows 3D measurement of native acetabular orientation, but with a substantial radiation dose. The EOS imaging system was developed to perform this kind of evaluation, but has not been validated in this indication with specific attention to the acetabulum. We therefore performed a prospective study using EOS to assess: 1) the reproducibility of the 3D acetabulum orientation measures; 2) normative asymptomatic acetabular morphology in standing position, according to side and gender; and 3) the relationship between acetabular anteversion and pelvic incidence...
December 23, 2016: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28017709/anatomical-analysis-of-the-relation-between-human-ligamentum-flavum-and-posterior-spinal-bony-prominence
#18
Javid Akhgar, Hidetomi Terai, Mohammad Suhrab Rahmani, Koji Tamai, Akinobu Suzuki, Hiromitsu Toyoda, Masatoshi Hoshino, Mitsuhiko Ikebuchi, Sayed Abdullah Ahmadi, Kazunori Hayashi, Hiroaki Nakamura
BACKGROUND: Posterior spinal bony prominences are commonly used as landmarks during posterior spinal surgery; however, the exact relationship of these structures with ligamentum flavum (LF) borders and attachments has not been clarified. MATERIALS AND METHODS: Whole spines were removed en bloc from 20 embalmed human cadavers. Plain radiographs and computed tomography (CT) scans of each whole spine were taken, and then the spine was divided in two parts along the pedicle bases...
December 22, 2016: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28009224/mesenteric-ischemia-following-the-correction-of-adult-spinal-deformity-case-report
#19
Krishn Khanna, Sigurd H Berven
Vascular complications are an important adverse event that can be associated with spinal reconstructive surgery. Direct injury of vessels, or indirect traction or compression of vessels, can cause both arterial and venous injury. Indirect compression of the mesenteric vessels is a well-recognized complication of bracing and surgical care of children with spinal deformity (superior mesenteric artery syndrome), but the complication is not common or well recognized in the adult population with spinal deformity...
December 23, 2016: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28005656/skeletal-changes-of-an-osteomyocutaneous-facial-allograft-five-years-following-transplantation
#20
Bahar Bassiri Gharb, Antonio Rampazzo, Gaby Doumit, Steven Bernard, Maria Siemionow, Francis Papay, Risal Djohan
BACKGROUND: More than 30 face transplantations have been performed worldwide, most including part of the facial skeletal framework. In this study, the modifications of the skeletal component of a facial allograft were evaluated. METHODS: Standard head computed tomography (CT) scans, CT angiogram, and bone mineral densitometry were evaluated. Cephalometric analysis was performed. The pre and postoperative CT images were overlapped and the skeletal changes were expressed in a numeric and color-coded scale...
December 21, 2016: Journal of Craniofacial Surgery
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