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https://www.readbyqxmd.com/read/28180978/3d-rod-shape-changes-in-adolescent-idiopathic-scoliosis-instrumentation-how-much-does-it-impact-correction
#1
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/28152019/3d-modeling-of-the-spine-using-eos-imaging-system-inter-reader-reproducibility-and-reliability
#2
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/28144582/reliability-and-concurrent-validity-of-postural-asymmetry-measurement-in-adolescent-idiopathic-scoliosis
#3
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/28131428/a-new-intraoperative-protocol-for-reducing%C3%A2-perioperative-transfusions-in%C3%A2-cardiac-surgery
#4
J Hunter Mehaffey, Sarah A Schubert, Michael G Gelvin, Eric J Charles, Robert B Hawkins, Lily E Johnston, Gorav Ailawadi, Irving L Kron, Leora T Yarboro
BACKGROUND: Perioperative anemia and blood product transfusion increases short-term and long-term morbidity and mortality during cardiac surgery. We hypothesized that streamlined cardiopulmonary bypass circuit and rotational thromboelastometry (ROTEM) would reduce blood product usage and improve outcomes. METHODS: All patients with Society of Thoracic Surgeons risk scores at our institution from January 2013 to June 2015 were included. Individuals were chronologically stratified into 2 groups according to institutional changes to a streamlined bypass circuit and ROTEM-guided transfusion...
January 25, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28114115/fully-automatic-segmentation-of-arbitrarily-shaped-fiducial-markers-in-cone-beam-ct-projections
#5
J Bertholet, H Wan, J Toftegaard, M L Schmidt, F Chotard, P J Parikh, P R Poulsen
Radio-opaque fiducial markers of different shapes are often implanted in or near abdominal or thoracic tumors to act as surrogates for the tumor position during radiotherapy. They can be used for real-time treatment adaptation, but this requires a robust, automatic segmentation method able to handle arbitrarily shaped markers in a rotational imaging geometry such as cone-beam computed tomography (CBCT) projection images and intra-treatment images. In this study, we propose a fully automatic dynamic programming (DP) assisted template-based (TB) segmentation method...
February 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28089512/paleozoic-nymphal-wing-pads-support-dual-model-of-insect-wing-origins
#6
Jakub Prokop, Martina Pecharová, André Nel, Thomas Hörnschemeyer, Ewa Krzemińska, Wiesław Krzemiński, Michael S Engel
The appearance of wings in insects, early in their evolution [1], has been one of the more critical innovations contributing to their extraordinary diversity. Despite the conspicuousness and importance of wings, the origin of these structures has been difficult to resolve and represented one of the "abominable mysteries" in evolutionary biology [2]. More than a century of debate has boiled the matter down to two competing alternatives-one of wings representing an extension of the thoracic notum, the other stating that they are appendicular derivations from the lateral body wall...
January 23, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28087062/timing-and-magnitude-of-lumbar-spine-contribution-to-trunk-forward-bending-and-backward-return-in-patients-with-acute-low-back-pain
#7
Iman Shojaei, Milad Vazirian, Elizabeth G Salt, Linda R Van Dillen, Babak Bazrgari
Alterations in the lumbo-pelvic coordination denote changes in neuromuscular control of trunk motion as well as load sharing between passive and active tissues in the lower back. Differences in timing and magnitude aspects of lumbo-pelvic coordination between patients with chronic low back pain (LBP) and asymptomatic individuals have been reported; yet, the literature on lumbo-pelvic coordination in patients with acute LBP is scant. A case-control study was conducted to explore the differences in timing and magnitude aspects of lumbo-pelvic coordination between females with (n=19) and without (n=19) acute LBP...
January 4, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28058796/hox-gene-expression-in-the-specialized-limbs-of-the-iberian-mole-talpa-occidentalis
#8
Constanze Bickelmann, Wessel van der Vos, Merijn A G de Bakker, Rafael Jiménez, Saskia Maas, Marcelo R Sánchez-Villagra
Fossorial talpid moles use their limbs predominantly for digging, which explains their highly specialized anatomy. The humerus is particularly short and dorsoventrally rotated, with broadened distal and proximal parts where muscles attach and which facilitate powerful abductive movements. The radius and ulna are exceptionally robust and short. The ulna has an expanded olecranon process. The femur is generalized, but the fused tibia-fibula complex is short and robust. To understand the developmental bases of these specializations, we studied expression patterns of four 5' Hox genes in the fossorial Iberian mole (Talpa occidentalis)...
January 2017: Evolution & Development
https://www.readbyqxmd.com/read/28048393/su-f-t-529-dosimetric-investigation-of-a-rotating-gamma-ray-system-for-imagedguided-modulated-arc-radiotherapy
#9
C Ma, O Chibani, A Eldib, J Li, L Chen
PURPOSE: Because of their effectiveness and efficiency, rotational arc radiotherapy (MAT) techniques have been developed on both specialty machines such as Tomotherapy and conventional linear accelerators. This work investigates a new rotating Gamma therapy system for image guided MAT and SBRT of intra/extracranial tumors. METHODS: The CyberMAT system (Cyber Medical Corp., China) consists of a ring gantry with a gamma source (effective source size 1cm and 1.7cm respectively), a 120-leaf MLC, a kV CBCT and an EPID...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047442/su-f-t-92-clinical-benefit-for-breast-and-chest-wall-setup-in-using-a-breast-board
#10
S Li, C Miyamoto, D Serratore, Q Liang, E Dziemianowicz
PURPOSE: To validate benefit of using a breast board (BB) by analyzing the geometry and dosimetry changes of the regions of interest (ROIs) between CT scans with and without BB. METHODS: Seven patients, two chest walls (CW) and five breasts, use BB at CT simulation and no BB at diagnostic CT were included. By using deformable image registration software (Velocity AI), diagnostic CT and planning CT were rigidly co-registered according to the thoracic cage at the target...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046784/mo-fg-campus-jep3-03-detection-of-unpredictable-patient-movement-during-sbrt-using-a-single-kv-projection-of-an-on-board-cbct-system-simulation-study
#11
Y Park, G Sharp, B Winey
PURPOSE: An unpredictable movement of a patient can occur during SBRT even when immobilization devices are applied. In the SBRT treatments using a conventional linear accelerator detection of such movements relies heavily on human interaction and monitoring. This study aims to detect such positional abnormalities in real-time by assessing intra-fractional gantry mounted kV projection images of a patient's spine. METHODS: We propose a self-CBCT image based spine tracking method consisting of the following steps: (1)Acquire a pre-treatment CBCT image; (2)Transform the CBCT volume according to the couch correction; (3)Acquire kV projections during treatment beam delivery; (4)Simultaneously with each acquisition generate a DRR from the CBCT volume based-on the current projection geometry; (5)Perform an intensity gradient-based 2D registration between spine ROI images of the projection and the DRR images; (6)Report an alarm if the detected 2D displacement is beyond a threshold value...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046767/su-g-bra-08-diaphragm-motion-tracking-based-on-kv-cbct-projections-with-a-constrained-linear-regression-optimization
#12
J Wei, M Chao
PURPOSE: To develop a novel strategy to extract the respiratory motion of the thoracic diaphragm from kilovoltage cone beam computed tomography (CBCT) projections by a constrained linear regression optimization technique. METHODS: A parabolic function was identified as the geometric model and was employed to fit the shape of the diaphragm on the CBCT projections. The search was initialized by five manually placed seeds on a pre-selected projection image. Temporal redundancies, the enabling phenomenology in video compression and encoding techniques, inherent in the dynamic properties of the diaphragm motion together with the geometrical shape of the diaphragm boundary and the associated algebraic constraint that significantly reduced the searching space of viable parabolic parameters was integrated, which can be effectively optimized by a constrained linear regression approach on the subsequent projections...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28041317/stereotactic-radiosurgery-for-intradural-spine-tumors-using-cone-beam-ct-image-guidance
#13
Andrés Monserrate, Benjamin Zussman, Alp Ozpinar, Ajay Niranjan, John C Flickinger, Peter C Gerszten
OBJECTIVE Cone-beam CT (CBCT) image guidance technology has been widely adopted for spine radiosurgery delivery. There is relatively little experience with spine radiosurgery for intradural tumors using CBCT image guidance. This study prospectively evaluated a series of intradural spine tumors treated with radiosurgery. Patient setup accuracy for spine radiosurgery delivery using CBCT image guidance for intradural spine tumors was determined. METHODS Eighty-two patients with intradural tumors were treated and prospectively evaluated...
January 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28038692/asymmetry-of-the-vertebral-body-and-pedicles-in-the-true-transverse-plane-in-adolescent-idiopathic-scoliosis-a-ct-based-study
#14
Rob C Brink, Tom P C Schlösser, Dino Colo, Koen L Vincken, Marijn van Stralen, Steve C N Hui, Winnie C W Chu, Jack C Y Cheng, René M Castelein
STUDY DESIGN: Cross-sectional. OBJECTIVES: To quantify the asymmetry of the vertebral bodies and pedicles in the true transverse plane in adolescent idiopathic scoliosis (AIS) and to compare this with normal anatomy. SUMMARY OF BACKGROUND DATA: There is an ongoing debate about the existence and magnitude of the vertebral body and pedicle asymmetry in AIS and whether this is an expression of a primary growth disturbance, or secondary to asymmetrical loading...
January 2017: Spine Deformity
https://www.readbyqxmd.com/read/28038690/the-development-of-a-representative-porcine-early-onset-scoliosis-model-with-a-standalone-posterior-spinal-tether
#15
R Bogie, A K Roth, P C Willems, Vd W Weegen, J J Arts, L W van Rhijn
STUDY DESIGN: In vivo analysis in a porcine model. OBJECTIVES: To develop a porcine experimental scoliosis model representative of early-onset scoliosis (EOS) with the use of a radiopaque ultra-high molecular weight polyethylene (UHMWPE) posterior spinal tether. SUMMARY OF BACKGROUND DATA: Large animal experimental scoliosis models with substantial growth potential are needed to test new fusionless scoliosis correction techniques. Previously described scoliosis models involve rib procedures, which violate the thoracic cage and affect subsequent corrective procedures...
January 2017: Spine Deformity
https://www.readbyqxmd.com/read/28038688/biomechanical-evaluation-of-a-growth-friendly-rod-construct
#16
Sarah Galvis, Josh Arnold, Erin Mannen, Benjamin Wong, Hadley Sis, Eileen Cadel, John Anderson, Dennis Anderson, Paul Arnold, Elizabeth Friis
BACKGROUND: Distraction-type rods mechanically stabilize the thorax and improve lung growth and function by applying distraction forces at the rib, spine, pelvis, or a combination of locations. However, the amount of stability the rods provide and the amount the thorax needs is unknown. METHODS: Five freshly frozen and thawed cadaveric thoracic spine specimens were tested for lateral bending, flexion/extension, and axial rotation in displacement control (1°/sec) to a load limit of ±5 Nm for five cycles after which a growth-friendly unilateral rod was placed in a simulated rib-to-lumbar attachment along the right side...
January 2017: Spine Deformity
https://www.readbyqxmd.com/read/28032226/posterior-corrective-surgery-for-moderate-to-severe-focal-kyphosis-in-the-thoracolumbar-spine-57-cases-with-minimum-3%C3%A2-years-follow-up
#17
Yan Zeng, Xiaochen Qu, Zhongqiang Chen, Xiaoxi Yang, Zhaoqing Guo, Qiang Qi, Weishi Li, Chuiguo Sun
PURPOSE: To evaluate the radiological and clinical outcomes of the corrective surgery for patients with moderate to severe focal kyphosis in thoracolumbar spine. METHODS: Fifty-seven patients with moderate to severe focal kyphosis of the thoracolumbar spine underwent apical segmental resection osteotomy with dual axial rotation correction at our hospital. There were 30 male and 27 female patients. The mean age was 34.3 years. The kyphosis level radiographs were obtained from each patient before surgery, immediately after surgery and at follow-up...
December 28, 2016: European Spine Journal
https://www.readbyqxmd.com/read/28018536/computer-modeling-to-evaluate-the-impact-of-technology-changes-on-resident-procedural-volume
#18
Tyler R Grenda, Tiffany N S Ballard, Andrea T Obi, William Pozehl, F Jacob Seagull, Ryan Chen, Amy M Cohn, Mark S Daskin, Rishindra M Reddy
BACKGROUND : As resident "index" procedures change in volume due to advances in technology or reliance on simulation, it may be difficult to ensure trainees meet case requirements. Training programs are in need of metrics to determine how many residents their institutional volume can support. OBJECTIVE : As a case study of how such metrics can be applied, we evaluated a case distribution simulation model to examine program-level mediastinoscopy and endobronchial ultrasound (EBUS) volumes needed to train thoracic surgery residents...
December 2016: Journal of Graduate Medical Education
https://www.readbyqxmd.com/read/28008267/oncological-outcomes-and-complications-after-volume-replacement-oncoplastic-breast-conservations-the-glasgow-experience
#19
Weiguang Ho, Sheila Stallard, Julie Doughty, Elizabeth Mallon, Laszlo Romics
INTRODUCTION: Oncoplastic breast conservation surgery (OBCS) combines the principles of surgical oncology and plastic surgery. OBCS has now become a growing option for the treatment of breast cancer and forms a part of breast-conserving therapy (BCT). We sought to investigate and report our experience in two breast units in Glasgow (Victoria Infirmary and Western Infirmary) on volume replacement OBCS. MATERIALS AND METHODS: Details of patients treated with volume replacement OBCS were identified from a prospectively recorded database from November 2010 to October 2015...
2016: Breast Cancer: Basic and Clinical Research
https://www.readbyqxmd.com/read/28002917/simultaneous-double-rod-and-en-bloc-direct-vertebral-rotation-technique-for-correction-of-main-thoracic-adolescent-idiopathic-scoliosis-retrospective-analysis-of-14-cases
#20
C Faldini, F Perna, M Chehrassan, R Borghi, K Martikos, A Mazzotti, N Stefanini, L Cristofolini, F Traina
Adolescent idiopathic scoliosis (AIS) is a triplanar deformity associated with rib hump, especially when a principle thoracic curve is present. The aim of this study is to evaluate the results of AIS correction retrospectively, using simultaneous double rod derotation manoeuvre technique followed by en-bloc direct vertebral rotation (DVR). Fourteen patients were included in this study. Coronal and sagittal thoracic Cobb angle, global coronal balance, sagittal balance, rib hump prominence, Scoliosis Research Society outcome instrument score (SRS-22) and Walter Reed visual assessment scale (WR-VAS) values were recorded pre- and postoperatively and evaluated...
October 2016: Journal of Biological Regulators and Homeostatic Agents
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