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Reconstruction of the. Spine

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https://www.readbyqxmd.com/read/28207657/3-tesla-kinematic-mri-of-the-cervical-spine-for-evaluation-of-adjacent-level-disease-after-monosegmental-anterior-cervical-discectomy-and-arthroplasty-results-of-2-year-follow-up
#1
Steffen K Fleck, Soenke Langner, Christian Rosenstengel, Rebecca Kessler, Marc Matthes, Jan-Uwe Müller, Inga Langner, Sascha Marx, Henry W S Schroeder
STUDY DESIGN: We prospectively evaluated adjacent disc levels after anterior cervical discectomy and arthroplasty (ACDA) using kinematic magnetic resonance imaging (MRI) and plain functional radiographs. OBJECTIVE: ACDA is an established treatment for degenerative cervical disc disease. The objective of this study was to evaluate the use of kinematic MRI for assessing the range of motion (ROM) before and after ACDA compared with plain functional radiographs and to evaluate adjacent degenerative disc disease (aDDD) at mid-term follow-up...
February 15, 2017: Spine
https://www.readbyqxmd.com/read/28187068/ct-based-three-dimensional-measurements-of-spine-shortening-distance-after-posterior-three-column-osteotomies-for-the-treatment-of-severe-and-stiff-scoliosis
#2
Xue-Shi Li, Zi-Fang Huang, Yao-Long Deng, Heng-Wei Fan, Wen-Yuan Sui, Chong-Wen Wang, Jun-Lin Yang
STUDY DESIGN: Retrospective Study. OBJECTIVES: This study is to measure and analyze the changes of three-dimensional distances of spinal column and spinal canal at the three-column osteotomy sites and address their clinical and neurologic significance. SUMMARY OF BACKGROUND DATA: Three-column osteotomies were developed to treat severe and stiff spine deformities with insufficient understanding on the safe limit of spine shortening and the relationship between the shortening distance of the spinal column and that of the spinal canal...
February 9, 2017: Spine
https://www.readbyqxmd.com/read/28180978/3d-rod-shape-changes-in-adolescent-idiopathic-scoliosis-instrumentation-how-much-does-it-impact-correction
#3
Franck Le Navéaux, Carl-Eric Aubin, Stefan Parent, Peter O Newton, Hubert Labelle
PURPOSE: Flattening of rods is known to reduce the correction capability of the instrumentation, but has not been studied in 3D. The aim is to evaluate the rods shape 3D changes during and immediately after instrumentation, and its effect on 3D correction. METHODS: The 5.5 mm CoCr rods of 35 right thoracic adolescent idiopathic scoliosis patients were measured from rod tracings prior to insertion, and reconstructed in 3D from bi-planar radiographs taken intra-operatively after the correction maneuvers and 1 week post-operatively...
February 8, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28164082/semiautomated-3d-spine-reconstruction-from-biplanar-radiographic-images-prediction-of-intervertebral-loading-in-scoliotic-subjects
#4
Tito Bassani, Claudia Ottardi, Francesco Costa, Marco Brayda-Bruno, Hans-Joachim Wilke, Fabio Galbusera
The present study proposes a semiautomatic software approach to reconstruct 3D subject-specific musculoskeletal model of thoracolumbar spine from radiographic digitized images acquired with EOS system. The approach is applied to evaluate the intervertebral loads in 38 standing adolescents with mild idiopathic scoliosis. For each vertebra, a set of landmarks was manually identified on radiographic images. The landmark coordinates were processed to calculate the following vertebral geometrical properties in the 3D space (i) location (ii) dimensions; and (iii) rotations...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28159488/lateral-lumbar-retroperitoneal-transpsoas-approach-in-the-setting-of-spondylodiscitis-a-technical-note
#5
George M Ghobrial, Fadi Al-Saiegh, Daniel Franco, Daniel Benito, Joshua Heller
Thoracolumbar spondylodiscitis is a morbid disease entity, impacting a sick patient population with multiple comorbidities. Wherever possible, surgical measures in this population should limit the extent of soft tissue disruption and overall morbidity that is often associated with anteroposterior thoracolumbar decompression and fusion. The authors describe the rationale, technique, and use of the lateral lumbar transpsoas retroperitoneal approach in tandem with posterior decompression and instrumented fusion in the treatment of circumferential thoracolumbar spondylodiscitis with or without epidural abscesses...
January 31, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28156208/image-guided-intrathecal-baclofen-pump-catheter-implantation-a-technical-note-and-case-series
#6
Shenandoah Robinson, Faith C Robertson, Hormuzdiyar H Dasenbrock, Cormac P O'Brien, Charles Berde, Horacio Padua
OBJECTIVE Medically refractory spasticity and dystonia are often alleviated with intrathecal baclofen (ITB) administration through an indwelling catheter inserted in the lumbar spine. In patients with cerebral palsy, however, there is a high incidence of concomitant neuromuscular scoliosis. ITB placement may be technically challenging in those who have severe spinal deformity or who have undergone prior instrumented thoracolumbar fusion. Although prior reports have described drilling through the lumbar fusion mass with a high-speed bur, as well as IT catheter implantation at the foramen magnum or cervical spine, these approaches have notable limitations...
February 3, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28152019/3d-modeling-of-the-spine-using-eos-imaging-system-inter-reader-reproducibility-and-reliability
#7
Johannes Rehm, Thomas Germann, Michael Akbar, Wojciech Pepke, Hans-Ulrich Kauczor, Marc-André Weber, Daniel Spira
OBJECTIVES: To retrospectively assess the interreader reproducibility and reliability of EOS 3D full spine reconstructions in patients with adolescent idiopathic scoliosis (AIS). METHODS: 73 patients with mean age of 17 years and a moderate AIS (median Cobb Angle 18.2°) obtained low-dose standing biplanar radiographs with EOS. Two independent readers performed "full spine" 3D reconstructions of the spine with the "full-spine" method adjusting the bone contour of every thoracic and lumbar vertebra (Th1-L5)...
2017: PloS One
https://www.readbyqxmd.com/read/28151859/cortical-bone-trajectory-screws-placement-via-pedicle-or-pedicle-rib-unit-in-the-pediatric-thoracic-spine-t9-t12-a-2-dimensional-multiplanar-reconstruction-study-using-computed-tomography
#8
Jun Xuan, Jian Chen, Hui He, Hai-Ming Jin, Di Zhang, Yao-Sen Wu, Nai-Feng Tian, Xiang-Yang Wang
Thoracic cortical bone trajectory (CBT) screw fixation can maximize the thread contact with cortical bone, and it is 53.8% higher than that of the traditional pedicle screws. Moreover, it can also enable less tissue dissection and retraction for reduced muscle disruption.Eighty pediatric patients are divided into 4 age groups and their thoracic vertebrae are analyzed on computed tomography (CT) images. The maximal screw length, maximal screw diameter, screw diameter, and the cephalad angle are measured. The statistical analysis is performed using the Student's t-test and Pearson's correlation analysis...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28129153/3d-morphology-prediction-of-progressive-spinal-deformities-from-probabilistic-modeling-of-discriminant-manifolds
#9
Samuel Kadoury, William Mandel, Marjolaine Roy-Beaudry, Marie-Lyne Nault, Stefan Parent
We introduce a novel approach for predicting the progression of adolescent idiopathic scoliosis from 3D spine models reconstructed from biplanar X-ray images. Recent progress in machine learning have allowed to improve classification and prognosis rates, but lack a probabilistic framework to measure uncertainty in the data. We propose a discriminative probabilistic manifold embedding where locally linear mappings transform data points from high-dimensional space to corresponding lowdimensional coordinates. A discriminant adjacency matrix is constructed to maximize the separation between progressive and non-progressive groups of patients diagnosed with scoliosis, while minimizing the distance in latent variables belonging to the same class...
January 23, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28125099/a-comparison-of-standard-two-dimensional-ultrasound-to-three-dimensional-volume-sonography-for-routine-second-trimester-fetal-imaging
#10
M E Roy-Lacroix, F Moretti, Z M Ferraro, L Brosseau, J Clancy, K Fung-Kee-Fung
OBJECTIVE: In comparison with standard two-dimensional (2D) imaging of fetal structure and biometry, we aimed to evaluate the role of three-dimensional (3D) imaging as a screening tool in the mid-trimester. STUDY DESIGN: Pregnant women presenting between 18and 22 weeks for routine anatomical survey and biometric measurements were recruited. Six volumes of fetal anatomic regions were obtained and archived for later reconstruction, along with three volumes of extra-fetal structures (placenta, cervix, amniotic fluid)...
January 26, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28120086/does-navigation-improve-pedicle-screw-placement-accuracy-comparison-between-navigated-and-non-navigated-percutaneous-and-open-fixations
#11
Gualtiero Innocenzi, Simona Bistazzoni, Manuela D'Ercole, Giovanni Cardarelli, Francesco Ricciardi
BACKGROUND: The aim of our study was to assess how a preoperative computed tomography (CT)-based navigation system affected the correctness and safety of transpedicular screw insertion, compared with standard techniques. METHOD: Between January 2012 and February 2014, 203 patients underwent thoracic and lumbar fixation, with open and percutaneous techniques; 218 screws were implanted through an open navigated technique (1.0 Spine & Trauma 3d ver. 2.0 BrainLab, Feldkirchen Germany) in 43 patients; 220 screws were inserted with an open free-hand technique in 45 patients; 230 screws were implanted in 56 patients using percutaneous CT-based navigation; and 236 screws were inserted in 59 patients using a percutaneous fluoroscopy-guided technique...
2017: Acta Neurochirurgica. Supplement
https://www.readbyqxmd.com/read/28120045/reconstructive-neurosurgery-a-challenge
#12
Massimiliano Visocchi
The International Society of Reconstructive Neurosurgery (ISRN) is an "open" multidisciplinary Society in evolution. Many different members of the Society inspire new trends in many different neurosurgical fields, all dealing with neurosurgical reconstruction.Spine and peripheral nerve reconstructive surgery, central nervous system revascularization (via surgery and interventional radiology), neuromodulation, bioengineering, and transplantation are recent tools used to promote reconstruction, restoration, and rehabilitation...
2017: Acta Neurochirurgica. Supplement
https://www.readbyqxmd.com/read/28118391/phylogeography-and-conservation-genetics-of-the-ibero-balearic-three-spined-stickleback-gasterosteus-aculeatus
#13
Marta Vila, Miguel Hermida, Carlos Fernández, Silvia Perea, Ignacio Doadrio, Rafaela Amaro, Eduardo San Miguel
Genetic isolation and drift may imperil peripheral populations of wide-ranging species more than central ones. Therefore, information about species genetic variability and population structure is invaluable for conservation managers. The Iberian populations of three-spined stickleback lie at the southwestern periphery of the European distribution of Gasterosteus aculeatus. This teleost is a protected species in Portugal and Spain and local extinctions have been reported in both countries during the last decades...
2017: PloS One
https://www.readbyqxmd.com/read/28112431/the-proximal-superficial-femoral-artery-perforator-flap-anatomic-study-and-clinical-cases
#14
Imran Ratanshi, Colin W McInnes, Avinash Islur
BACKGROUND: The upper thigh has provided multiple new soft tissue free flaps in recent decades, including the anterolateral thigh, anteromedial thigh, transverse upper gracilis, the profunda artery perforator, and superficial circumflex iliac perforator flaps. The purpose of this study is to describe a new, reliable free flap option in the upper thigh: the proximal superficial femoral artery perforator (p-SFAP) flap. METHODS: A cadaveric dissection study was performed to confirm clinical landmarks and evaluate pedicle characteristics...
January 23, 2017: Microsurgery
https://www.readbyqxmd.com/read/28108780/cement-augmented-screws-in-a-cervical-two-level-corpectomy-with-anterior-titanium-mesh-cage-reconstruction-a-biomechanical-study
#15
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/28098744/trabecular-microstructure-and-damage-affect-cement-leakage-from-the-basivertebral-foramen-during-vertebral-augmentation
#16
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
#17
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...
February 2017: 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
#18
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
#19
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
#20
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
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