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https://www.readbyqxmd.com/read/28750035/the-modulation-of-eeg-variability-between-internally-and-externally-driven-cognitive-states-varies-with-maturation-and-task-performance
#1
Jessie M H Szostakiwskyj, Stephanie E Willatt, Filomeno Cortese, Andrea B Protzner
Increasing evidence suggests that brain signal variability is an important measure of brain function reflecting information processing capacity and functional integrity. In this study, we examined how maturation from childhood to adulthood affects the magnitude and spatial extent of state-to-state transitions in brain signal variability, and how this relates to cognitive performance. We looked at variability changes between resting-state and task (a symbol-matching task with three levels of difficulty), and within trial (fixation, post-stimulus, and post-response)...
2017: PloS One
https://www.readbyqxmd.com/read/28749895/mechanical-modeling-of-a-keratoconic-cornea
#2
Jean Marc Perone, Jean Baptiste Conart, Pierre-Jean Bertaux, Nicolas Sujet-Perone, Nadia Ouamara, Maxime Sot, Jean Jacques Henry
PURPOSE: We created a laboratory model of a cornea that was subjected to various pressures and thermal and mechanical factors to better understand the genesis of keratoconus deformation. METHODS: A steel base allowed for fixation of circular multilaminated patches of araldite (10 cm in diameter, 5 mm thick) in which the corneal anatomy was modeled. The model was plunged into a steam room (374°F/3 bars of pressure for 1 h) to ensure thermal homogeneity and was subjected to pressure using compressed air...
July 26, 2017: Cornea
https://www.readbyqxmd.com/read/28747337/comparisons-of-external-fixator-combined-with-limited-internal-fixation-and-open-reduction-and-internal-fixation-for-sanders-type-2-calcaneal-fractures-finite-element-analysis-and-clinical-outcome
#3
M Pan, L Chai, F Xue, L Ding, G Tang, B Lv
OBJECTIVES: The aim of this study was to compare the biomechanical stability and clinical outcome of external fixator combined with limited internal fixation (EFLIF) and open reduction and internal fixation (ORIF) in treating Sanders type 2 calcaneal fractures. METHODS: Two types of fixation systems were selected for finite element analysis and a dual cohort study. Two fixation systems were simulated to fix the fracture in a finite element model. The relative displacement and stress distribution were analysed and compared...
July 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28746061/lengthening-with-monolateral-external-fixation-versus-magnetically-motorized-intramedullary-nail-in-congenital-femoral-deficiency
#4
Vivian L Szymczuk, Ahmed I Hammouda, Martin G Gesheff, Shawn C Standard, John E Herzenberg
BACKGROUND: Limb lengthening for congenital femoral deficiency (CFD) with or without fibular hemimelia can be performed with both external and internal devices. The purpose of this study is to compare clinical outcomes of femoral lengthening utilizing monolateral external fixation versus a magnetically motorized intramedullary nail in patients with CFD with or without fibular hemimelia. METHODS: This retrospective review included 62 patients with femoral lengthening, 32 patients had monolateral external fixation (group A), 30 patients had internal lengthening nail (group B)...
June 25, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28745799/efficacy-of-femoral-nail-anti-rotation-of-helical-blade-in-unstable-intertrochanteric-fracture
#5
Y Guo, H-P Yang, Q-J Dou, X-B He, X-F Yang
OBJECTIVE: We analyzed the comparative efficacy and long-term prognosis with proximal femoral nail anti-rotation (PFNA) and dynamic hip screw (DHS) for the treatment of unstable intertrochanteric fractures, retrospectively. We determined the independent risk factors to guide subsequent surgery and improve the long-term quality of life. PATIENTS AND METHODS: We selected 165 patients suffering from unstable intertrochanteric fracture from January 2010 to January 2015 in our hospital, including 89 treated with PFNA and 76 with DHS surgery...
July 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28743379/a-novel-hydroxyapatite-based-screw-like-device-for-anterior-cruciate-ligament-acl-reconstructions
#6
Thomas C Schumacher, Kamen Tushtev, Ulrich Wagner, Caroline Becker, Marzellus Große Holthaus, Sebastian B Hein, Janne Haack, Christian Heiss, Markus Engelhardt, Thaqif El Khassawna, Kurosch Rezwan
BACKGROUND: Rupture of the anterior cruciate ligament (ACL) is one of the most common injuries of the knee. Common techniques for ACL reconstruction require a graft fixation using interference screws. Nowadays, these interference screws are normally made of titanium or polymer/ceramic composites. The main challenge of application of a fixation device made entirely of bioactive ceramic is in relation to the low strength of such materials. The purpose of this study was to evaluate a novel geometry for a fixation device made of pure hydroxyapatite for ACL reconstructions that can overcome some problems of the titanium and the polymer/ceramic screws...
July 22, 2017: Knee
https://www.readbyqxmd.com/read/28741411/intraoperative-evaluation-of-the-effects-of-femoral-component-offset-and-head-size-on-joint-stability-in-total-hip-arthroplasty
#7
Tetsuya Jinno, Daisuke Koga, Yoshinori Asou, Sadao Morita, Atsushi Okawa, Takeshi Muneta
PURPOSE: To evaluate intraoperatively the effects of femoral offset and head size on stability of the hip joints in total hip arthroplasty (THA) via posterior approach. METHODS: Thirty cementless THAs were included in this study. After acetabular shell and femoral broach fixation, trial reduction was repeated using a femoral neck (5- to 8-mm higher or standard offset) and a head (26 mm or 32 mm). To evaluate joint stability, range of internal rotation (IR) in hip flexion prior to posterior subluxation and range of external rotation (ER) in hip extension were measured...
January 1, 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28735766/risk-factor-analysis-for-predicting-vertebral-body-re-collapse-after-posterior-instrumented-fusion-in-thoracolumbar-burst-fracture
#8
Hae-Dong Jang, Jae Chul Lee, Jae-Wan Soh, Sung-Woo Choi, Hyeung-Kyu Cho, Byung-Joon Shin
BACKGROUND CONTEXT: In the posterior instrumented fusion surgery for thoracolumbar (T-L) burst fracture, early postoperative re-collapse of well-reduced vertebral body fracture could induces critical complications such as correction loss, post-traumatic kyphosis, metal failure, often lead to revision surgery. Furthermore, re-collapse is quite difficult to predict because of the variety of risk factors and no widely accepted accurate prediction systems existed. Although load sharing classification (LSC) has been known to help to decide the need for additional anterior column support, this radiographic scoring system has several critical limitations...
July 20, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28734494/bone-transport-versus-acute-shortening-for-the-management-of-infected-tibial-non-unions-with-bone-defects
#9
Kevin Tetsworth, Cengiz Sen, John E Herzenberg, Matthew Jaffe, Dean C Maar, Vaida Glatt, Dror Paley, Erik Hohmann
INTRODUCTION: This study compared bone transport to acute shortening/lengthening in a series of infected tibial segmental defects for infected tibial non-union. METHODS: In a retrospective comparative study 42 patients treated for infected tibial non-union with segmental bone loss measuring between 3 and 10cm were included. Group A was treated with bone transport and Group B with acute shortening/lengthening. All patients were treated by Ilizarov methods for gradual correction as bi-focal or tri-focal treatment; the treating surgeon selected either transport or acute shortening based on clinical considerations...
July 12, 2017: Injury
https://www.readbyqxmd.com/read/28727652/surgical-emphysema-following-canalplasty-for-aural-exostoses
#10
Michael C Baxter, Matthew Keller, Anil Shah, Sean Wise
OBJECTIVE: To describe the presentation and management of surgical emphysema involving the temporomandibular joint and deep neck following exostoses removal. PATIENT: A 60-year-old male surfer presented with hearing loss and recurrent infections in the right ear. An examination revealed obstructing bony exostoses in the right external auditory canal. He underwent right canalplasty using a postauricular approach. At 5 weeks after surgery, he presented with right otalgia, swelling of the right face and neck, and complaints of a squeaking noise in the right ear with mandibular excursions...
July 19, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28725933/-callus-distraction-and-bone-transport-in-the-treatment-of-bone-defects
#11
REVIEW
R Baumgart, B Schuster, T Baumgart
BACKGROUND: The method of "callus distraction" is the only technique which spontaneously produces vascularized bone within the surrounding soft tissues during lengthening reconstructive procedures. Remodeling of the regenerate bone to specific mechanical load can be influenced by the surgeon. In principle, there is no limit to the amount of new bone formation which can be created; this vascularized bone is both resistant to infection and can be created to replace resected infected bone...
July 19, 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28724849/the-ilizarov-mini-external-fixator-for-the-treatment-of-first-metatarsal-fracture-a-case-report
#12
Tatsunori Kataoka, Norie Kodera, Shinro Takai
Forefoot fractures are frequently accompanied by severe soft tissue damage. Therefore, treatment should focus not only on fractures but also on soft tissue damage, for which external fixation can be used as a surgical option. A 63-year-old woman presented to the emergency clinic of our hospital with forefoot pain after a motorcycle accident. Comminuted fracture of the proximal part of the metatarsal was diagnosed. Because of the swollen foot and fracture comminution, an operation using the Ilizarov mini external fixator was performed to prevent further damage to the soft tissue...
2017: Journal of Nippon Medical School, Nippon Ika Daigaku Zasshi
https://www.readbyqxmd.com/read/28721484/a-comparison-of-external-fixation-and-locked-intramedullary-nailing-in-the-treatment-of-femoral-diaphysis-fractures-from-gunshot-injuries
#13
G Polat, H I Balci, O N Ergin, A Asma, C Şen, Ö Kiliçoğlu
INTRODUCTION: We studied the safety and incidence of complications from the treatment of gunshot-induced femur diaphysis fractures with locked intramedullary nailing in comparison to external fixation. METHODS: Patients who had femoral diaphysis fracture operations due to gunshot injuries (107 femurs of 99 patients) between 2003 and 2014 were retrospectively reviewed, and 66 femurs of 60 patients were place into two groups (Group A: intramedullary nailing-38 femurs of the 36 patients; Group B: external fixator-28 femurs of 24 patients)...
July 18, 2017: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/28720046/strain-as-a-function-of-time-in-extrinsic-wrist-ligaments-tensioned-through-external-fixation
#14
Joseph P Rectenwald, K Ashley Bentley, Peter M Murray, Subrata Saha
BACKGROUND: The objective of this study is to determine the time-dependent dissipation of extrinsic wrist ligament tension following the application external fixation with axial distraction of the wrist in a cadaveric model. METHODS: Six paired fresh-frozen cadaveric specimens underwent mechanical testing simulating external fixation with 1 arm of each pair osteotomized to simulate a distal radius fracture. The change in tension was then recorded over 24 hours. RESULTS: The rate of stress relaxation decreased with time...
February 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28719943/treatment-with-circular-external-fixation-of-bicondylar-tibial-fractures-potential-in-accurate-reduction-and-efficacy-on-functional-results
#15
Giovanni Lovisetti, Ettore Vulcano, Lorenzo Bettella, Rohoman Tasarib, Tania Tondolo, Francesco Sala
No abstract text is available yet for this article.
July 18, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28717013/mechanisms-of-carbon-dioxide-acquisition-and-co2-sensing-in-marine-diatoms-a-gateway-to-carbon-metabolism
#16
REVIEW
Yusuke Matsuda, Brian M Hopkinson, Kensuke Nakajima, Christopher L Dupont, Yoshinori Tsuji
Diatoms are one of the most successful marine eukaryotic algal groups, responsible for up to 20% of the annual global CO2 fixation. The evolution of a CO2-concentrating mechanism (CCM) allowed diatoms to overcome a number of serious constraints on photosynthesis in the marine environment, particularly low [CO2]aq in seawater relative to concentrations required by the CO2 fixing enzyme, ribulose-1,5-bisphosphate carboxylase/oxygenase (RubisCO), which is partly due to the slow diffusion rate of CO2 in water and a limited CO2 formation rate from [Formula: see text] in seawater...
September 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28716177/septal-extension-graft-in-closed-revision-rhinoplasty-a-simplified-technique
#17
Alberto Scattolin, Pier-Francesco Galzignato, Fabrizio Longari, Luca D'Ascanio
BACKGROUND: The septal extension graft (SEG) is widely used in secondary rhinoplasty for correction of a short nose with loss of tip support and projection, columellar retraction, and hyper-rotated tip secondary to an overresection of the caudal septum. Although SEG precise fixation can be relatively easy in the external approach, the difficulties of SEG placement in "closed" rhinoplasty can be discouraging. OBJECTIVE: To describe an easy surgical technique for SEG placement in endonasal revision rhinoplasty and to analyze the aesthetic results of the procedure...
July 1, 2017: American Journal of Rhinology & Allergy
https://www.readbyqxmd.com/read/28715124/chemical-imaging-of-fresh-vascular-smooth-muscle-cell-response-by-epi-detected-stimulated-raman-scattering
#18
Delong Zhang, Wei Chen, Huan Chen, Han-Qing Yu, Ghassan Kassab, Ji-Xin Cheng
An understanding of deformation of cardiovascular tissue under hemodynamic load is crucial for understanding the health and disease of blood vessels. In the present work, an epi-detected stimulated Raman scattering (epi-SRS) imaging platform was designed for in situ functional imaging of vascular smooth muscle cells (VMSCs) in fresh coronary arteries. For the first time, the pressure-induced morphological deformation of fresh VSMCs was imaged with no fixation and in a label free manner. The relation between the loading pressure and the morphological parameters, including angle and length of the VSMCs, were apparent...
July 17, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28713304/eye-behavior-associated-with-internally-versus-externally-directed-cognition
#19
Mathias Benedek, Robert Stoiser, Sonja Walcher, Christof Körner
What do our eyes do when we are focused on internal representations such as during imagination or planning? Evidence from mind wandering research suggests that spontaneous shifts from externally directed cognition (EDC) to internally directed cognition (IDC) involves oculomotor changes indicative of visual disengagement. In the present study, we investigated potential differences in eye behavior between goal-directed forms of IDC and EDC. To this end, we manipulated the focus of attention (internal versus external) in two demanding cognitive tasks (anagram and sentence generation)...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28713234/leftward-deviation-and-asymmetric-speed-of-egocentric-judgment-between-left-and-right-visual-fields
#20
Ying Zhou, Bing Li, Gang Wang, Mingsha Zhang, Yujun Pan
The egocentric reference frame is essential for body orientation and spatial localization of external objects. Recent neuroimaging and lesion studies have revealed that the right hemisphere of humans may play a more dominant role in processing egocentric information than the left hemisphere. However, previous studies of egocentric discrimination mainly focused on assessing the accuracy of egocentric judgment, leaving its timing unexplored. In addition, most previous studies never monitored the subjects' eye position during the experiments, so the influence of eye position on egocentric judgment could not be excluded...
2017: Frontiers in Neuroscience
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