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Deformable Segmentation

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https://www.readbyqxmd.com/read/30514043/-analysis-of-influencing-factors-the-postoperative-axial-symptoms-of-cervical-single-open-door-laminoplasty
#1
Xiao-Long Zhu, Wei-Xing Xu, Wei-Guo Ding, Hong-Feng Sheng, Jie Liu, Ying Hu, Zhen-Nan Tong
OBJECTIVE: To explore the influencing factors and possible mechanism of axial symptoms(AS) after C₃-C₇ single open-door laminoplasty in patients with chronic compression cervical myelopathy. METHODS: The clinical data of 32 patients with multi-segment chronic compression cervical cord disease treated by C₃-C₇ single open-door laminectomy from May 2012 to July 2016 were retrospectively analyzed. Including cervical spondylotic myelopathy of 14 cases, developmental cervical stenosis complicated with cervical myelopathy of 8 cases, ossification of posterior longitudinal ligament(OPLL) of 10 cases...
November 25, 2018: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/30506610/variability-of-right-ventricular-global-and-segmental-longitudinal-strain-measurements
#2
Oana Mirea, Mihaela Berceanu, Ionuț Donoiu, Constantin Militaru, Adrian Săftoiu, Octavian Istrătoaie
OBJECTIVES: We evaluated intra-observer, test-retest, and inter-observer reproducibility of right ventricular (RV) longitudinal strain (LS) measurements derived from two-dimensional speckle tracking echocardiography. BACKGROUND: The assessment of RV deformation has demonstrated to hold valuable prognostic and diagnostic data in clinical practice. Data about the reproducibility of the measurements, however, are missing. METHODS: In 200 subjects, apical modified four-chamber view focused on the right ventricle (RV) was obtained...
December 1, 2018: Echocardiography
https://www.readbyqxmd.com/read/30503298/prediction-of-mechanical-complications-in-adult-spinal-deformity-surgery-the-gap-score-versus-the-schwab-classification
#3
Eva Jacobs, Barend J van Royen, Sander M J van Kuijk, Johannes M R Merk, Agnita Stadhouder, Lodewijk W van Rhijn, Paul C Willems
BACKGROUND CONTEXT: - Surgery for adult spinal deformity (ASD) is a challenging and complex procedure with high reported complication (8.4-42%) and revision rates (9-17.6%). Failure to achieve or maintain adequate postoperative sagittal alignment has been reported to be the main cause of mechanical complications. In order to define appropriate surgical targets, the Scoliosis Research Society (SRS)-Schwab classification and the Global Alignment and Proportion (GAP) score were established...
November 29, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/30500589/anterior-column-realignment-in-adult-spinal-deformity-a-case-report-and-review-of-the-literature
#4
Zoe B Cheung, Daniel H Chen, Samuel J W White, Jun S Kim, Samuel K Cho
OBJECTIVE: Anterior column realignment (ACR) is a new emerging minimally invasive surgical technique in adult spinal deformity (ASD) that has the potential to provide similar corrective ability to traditional posterior approaches. This paper reviews the current literature on the clinical efficacy and safety of ACR and illustrates an additional utilization of this technique in a case of sagittal imbalance following posterior spinal fusion with segmental instrumentation. METHODS: We performed a literature search of all published ACR reports using PubMed, including only clinical papers describing the ACR technique and reporting radiographic and/or clinical outcomes...
November 27, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/30497230/change-in-the-cross-sectional-area-of-the-thecal-sac-following-balloon-kyphoplasty-for-pathological-vertebral-compression-fractures-prior-to-spine-stereotactic-radiosurgery
#5
(no author information available yet)
OBJECTIVEPercutaneous vertebral augmentation procedures such as vertebroplasty and kyphoplasty are often performed in cancer patients to relieve mechanical axial-load pain due to pathological collapse deformities. The collapsed vertebrae in these patients can be associated with varying degrees of spinal canal compromise that can be worsened by kyphoplasty. In this study the authors evaluated changes to the spinal canal, in particular the cross-sectional area of the thecal sac, following balloon kyphoplasty (BKP) prior to stereotactic radiosurgery (SRS)...
October 1, 2018: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/30497219/biomechanical-assessment-of-proximal-junctional-semi-rigid-fixation-in-long-segment-thoracolumbar-constructs
#6
(no author information available yet)
OBJECTIVEProximal junctional kyphosis (PJK) and failure (PJF) are potentially catastrophic complications that result from abrupt changes in stress across rigid instrumented and mobile non-fused segments of the spine (transition zone) after adult spinal deformity surgery. Recently, data have indicated that extension (widening) of the transitional zone via use of proximal junctional (PJ) semi-rigid fixation can mitigate this complication. To assess the biomechanical effectiveness of 3 semi-rigid fixation constructs (compared to pedicle screw fixation alone), the authors performed cadaveric studies that measured the extent of PJ motion and intradiscal pressure changes (ΔIDP)...
October 1, 2018: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/30497176/radiographic-outcome-and-complications-after-single-level-lumbar-extended-pedicle-subtraction-osteotomy-for-fixed-sagittal-malalignment-a-retrospective-analysis-of-55-adult-spinal-deformity-patients-with-a-minimum-2-year-follow-up
#7
(no author information available yet)
OBJECTIVEFixed sagittal spinal malalignment is a common problem in adult spinal deformity (ASD). Various three-column osteotomy techniques, including the extended pedicle subtraction osteotomy (ePSO), may correct global and regional malalignment in this patient population. In contrast to the number of reports on traditional PSO (Schwab grade 3 osteotomy), there is limited literature on the outcomes of ePSO (Schwab grade 4 osteotomy) in ASD surgery. The objective of this retrospective study was to provide focused investigation of radiographic outcomes and complications of single-level lumbar ePSO for ASD patients with fixed sagittal malalignment...
November 1, 2018: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/30496308/quantifying-skeletal-muscle-volume-and-shape-in-humans-using-mri-a-systematic-review-of-validity-and-reliability
#8
Christelle Pons, Bhushan Borotikar, Marc Garetier, Valérie Burdin, Douraied Ben Salem, Mathieu Lempereur, Sylvain Brochard
AIMS: The aim of this study was to report the metrological qualities of techniques currently used to quantify skeletal muscle volume and 3D shape in healthy and pathological muscles. METHODS: A systematic review was conducted (Prospero CRD42018082708). PubMed, Web of Science, Cochrane and Scopus databases were searched using relevant keywords and inclusion/exclusion criteria. The quality of the articles was evaluated using a customized scale. RESULTS: Thirty articles were included, 6 of which included pathological muscles...
2018: PloS One
https://www.readbyqxmd.com/read/30488501/myocardial-constructive-work-is-impaired-in-hypertrophic-cardiomyopathy-and-predicts-left-ventricular-fibrosis
#9
Elena Galli, Emilie Vitel, Frédéric Schnell, Virginie Le Rolle, Arnaud Hubert, Mathieu Lederlin, Erwan Donal
BACKGROUND: The estimation of myocardial work by pressure strain loops (PSLs) is a totally new non-invasive approach to assess myocardial performance, and its role in patients with hypertrophic cardiomyopathy is unknown. The aims of the present study are therefore: (a) to compare myocardial work in patients with non-obstructive hypertrophic cardiomyopathy (HCM) and in a subset of age-matched healthy controls and (b) to assess the correlation between myocardial work and left ventricular (LV) fibrosis...
November 29, 2018: Echocardiography
https://www.readbyqxmd.com/read/30486624/clinical-efficacy-of-intra-operative-cell-salvage-system-in-major-spinal-deformity-surgery
#10
Ho Yong Choi, Seung-Jae Hyun, Ki-Jeong Kim, Tae-Ahn Jahng, Hyun-Jib Kim
Objective: The purpose of this study was to determine the efficacy of intra-operative cell salvage system (ICS) to decrease the need for allogeneic transfusions in patients undergoing major spinal deformity surgeries. Methods: A total of 113 consecutive patients undergoing long level posterior spinal segmental instrumented fusion (≥5 levels) for spinal deformity correction were enrolled. Data including the osteotomy status, the number of fused segments, estimated blood loss, intra-operative transfusion amount by ICS (Cell Saver®, Haemonetics©, Baltimore, MA, USA) or allogeneic blood, postoperative transfusion amount, and operative time were collected and analyzed...
November 30, 2018: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/30485215/location-of-correction-within-the-lumbar-spine-impacts-acute-adjacent-segment-kyphosis
#11
(no author information available yet)
OBJECTIVEThe surgical correction of adult spinal deformity (ASD) often involves modifying lumbar lordosis (LL) to restore ideal sagittal alignment. However, corrections that include large changes in LL increase the risk for development of proximal junctional kyphosis (PJK). Little is known about the impact of cranial versus caudal correction in the lumbar spine on the occurrence of PJK. The goal of this study was to investigate the impact of the location of the correction on acute PJK development.METHODSThis study was a retrospective review of a prospective multicenter database...
October 1, 2018: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/30483961/characteristics-of-deformity-surgery-in-patients-with-severe-and-rigid-cervical-kyphosis-ck-results-of-the-csrs-europe-multi-centre-study-project
#12
H Koller, C Ames, H Mehdian, R Bartels, R Ferch, V Deriven, H Toyone, C Shaffrey, J Smith, W Hitzl, J Schröder, Yohan Robinson
INTRODUCTION AND PURPOSE: Little information exists on surgical characteristics, complications and outcomes with corrective surgery for rigid cervical kyphosis (CK). To collate the experience of international experts, the CSRS-Europe initiated an international multi-centre retrospective study. METHODS: Included were patients at all ages with rigid CK. Surgical and patient specific characteristics, complications and outcomes were studied. Radiographic assessment included global and regional sagittal parameters...
November 27, 2018: European Spine Journal
https://www.readbyqxmd.com/read/30483912/iterative-simulations-to-estimate-the-elastic-properties-from-a-series-of-mri-images-followed-by-mri-us-validation
#13
Francesco Visentin, Vincent Groenhuis, Bogdan Maris, Diego Dall'Alba, Françoise Siepel, Stefano Stramigioli, Paolo Fiorini
The modeling of breast deformations is of interest in medical applications such as image-guided biopsy, or image registration for diagnostic purposes. In order to have such information, it is needed to extract the mechanical properties of the tissues. In this work, we propose an iterative technique based on finite element analysis that estimates the elastic modulus of realistic breast phantoms, starting from MRI images acquired in different positions (prone and supine), when deformed only by the gravity force...
November 27, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/30480204/image-based-3-dimensional-characterization-of-laryngotracheal-stenosis-in-children
#14
Lee S McDaniel, William J Poynot, Keith A Gonthier, Michael E Dunham, And Tyler W Crosby
Objectives: Describe a technique for the description and classification of laryngotracheal stenosis in children using 3-dimensional reconstructions of the airway from computed tomography (CT) scans. Study Design: Cross-sectional. Setting: Academic tertiary care children's hospital. Subjects and Methods: Three-dimensional models of the subglottic airway lumen were created using CT scans from 54 children undergoing imaging for indications other than airway disease...
January 2018: OTO open
https://www.readbyqxmd.com/read/30472824/segmental-spinal-dysgenesis-redefined
#15
Amarnath Chellathurai, Balaji Ayyamperumal, Rajakumari Thirumaran, Gopinathan Kathirvelu, Priya Muthaiyan, Sivakumar Kannappan
Study Design: Retrospective single institutional observational study. Purpose: Segmental spinal dysgenesis (SSD), a complex spinal dysraphic state caused by notochord malformation disorders, is named after its morphological presentation where a spine segment is dysgenetic, malformed or absent. This study's objective was to examine and reassess SSD imaging findings and correlate them with an embryological explanation. Overview of Literature: Scott and his colleagues defined SSD as segmental agenesis or dysgenesis of the lumbar or thoracolumbar vertebrae and underlying spinal cord...
November 27, 2018: Asian Spine Journal
https://www.readbyqxmd.com/read/30470390/excessive-gingival-display-treated-with-2-piece-segmental-le-fort-i-osteotomy-a-case-report
#16
Natsuko Hichijo, Masahiro Furutani, Shingo Kuroda, Eiji Tanaka
BACKGROUND: The demand for orthognathic surgery has increased worldwide. Women with jaw deformity tend to have a worse quality of life than men owing to the deformity's negative effects on body image, low self-esteem, lack of self-confidence, and dissatisfaction with life. Therefore, they wish for more reliable treatment options. CASE DESCRIPTION: A woman aged 25 years and 9 months sought treatment for a convex profile and excessive gingival display caused by a skeletal Class II jaw-base relationship...
November 20, 2018: Journal of the American Dental Association
https://www.readbyqxmd.com/read/30468849/cardiac-substructure-segmentation-and-dosimetry-using-a-novel-hybrid-mr-ct-cardiac-atlas
#17
Eric D Morris, Ahmed I Ghanem, Milan V Pantelic, Eleanor M Walker, Xiaoxia Han, Carri K Glide-Hurst
PURPOSE: Radiation dose to the heart and cardiac substructures has been linked to cardiotoxicities. As cardiac substructures are poorly visualized on treatment planning computed tomography (CT), we employed the superior soft tissue contrast of magnetic resonance (MR) imaging to optimize a hybrid MR/CT atlas for substructure dose assessment using CT. METHODS: Thirty-one left breast cancer patients underwent a T2-weighted MR and non-contrast simulation CTs. A radiation oncologist delineated 13 substructures (chambers, great vessels, coronary arteries etc...
November 20, 2018: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/30464056/eumobot-replicating-euglenoid-movement-in-a-soft-robot
#18
Krishna Manaswi Digumarti, Andrew T Conn, Jonathan Rossiter
Swimming is employed as a form of locomotion by many organisms in nature across a wide range of scales. Varied strategies of shape change are employed to achieve fluidic propulsion at different scales due to changes in hydrodynamics. In the case of microorganisms, the small mass, low Reynolds number and dominance of viscous forces in the medium, requires a change in shape that is non-invariant under time reversal to achieve movement. The Euglena family of unicellular flagellates evolved a characteristic type of locomotion called euglenoid movement to overcome this challenge, wherein the body undergoes a giant change in shape...
November 21, 2018: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/30463576/experimental-comparisons-of-passive-and-powered-ankle-foot-orthoses-in-individuals-with-limb-reconstruction
#19
Elizabeth Russell Esposito, Kelly A Schmidtbauer, Jason M Wilken
BACKGROUND: Ankle-foot orthoses (AFO) are commonly prescribed to provide functional assistance for patients with lower limb injuries or weakness. Their passive mechanical elements can provide some energy return to improve walking ability, but cannot restore plantar flexor push-off. Powered AFOs provide an assistive torque about the ankle to address the limitations of passive devices, but current designs have yet to be implemented on a large scale clinically. PURPOSE: To compare passive AFOs to a new untethered, powered AFO design in a clinical population with lower limb reconstruction...
November 21, 2018: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/30459881/laminectomy-versus-laminoplasty-in-the-surgical-management-of-long-segment-intradural-spinal-tumors-any-difference-in-neurological-outcomes
#20
Chiazor U Onyia, Sajesh K Menon
Background: Previous comparative studies have shown that apart from lack of any significant difference in neurologic outcomes between laminoplasty and laminectomy following resection of intradural spinal tumours, spinal column issues such as postoperative deformities, malalignment, and adjacent level disease have also been clearly demonstrated to be quite similar for both techniques. However, there is no study yet that describes any difference in neurologic outcomes for long-segment intradural lesions as a rare subset of these lesions (in terms of number of spinal segments involved) following surgical management between these two techniques...
October 2018: Asian Journal of Neurosurgery
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