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https://www.readbyqxmd.com/read/28214455/dorsal-plating-of-distal-radius-fractures-historical-context-and-appropriate-use
#1
Omri Ayalon, Nader Paksima
The management of distal radius fractures has evolved over time from a largely nonoperative paradigm to a more commonly performed operative procedures today. Surgical trends have similarly developed, with dorsal plating falling out of favor due to complications involving extensor tendon pathology as well as due to the ubiquity of the volar plate along with the advent of locking plate technology. However, with the improvement in design of newer generation dorsal plates, this technique should be used in the appropriate clinical situation, including dorsal comminution and angulation with concomitant carpal pathology...
January 2017: Bulletin of the Hospital for Joint Diseases
https://www.readbyqxmd.com/read/28214173/pyrocarbon-interposition-shoulder-arthroplasty-preliminary-results-from-a-prospective-multicenter-study-at-2-years-of-follow-up
#2
Jérôme Garret, Arnaud Godeneche, Pascal Boileau, Daniel Molé, Mikael Etzner, Luc Favard, Christophe Levigne, François Sirveaux, Marc-Olivier Gauci, Charles Dezaly, Gilles Walch
BACKGROUND: The concept of free interposition arthroplasty proved successful for small joints of the hand, wrist, and foot, particularly after the use of implants coated with pyrocarbon, which enhanced their tribologic and elastic properties. The present study reports preliminary outcomes of a pyrocarbon-coated interposition shoulder arthroplasty (PISA) implant. METHODS: This was a prospective study of 67 consecutive patients who underwent shoulder PISA at 9 centers...
February 14, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28213013/time-course-of-germination-initiation-of-mycelium-proliferation-and-probability-of-visible-growth-and-detectable-afb1-production-of-an-isolate-of-aspergillus-flavus-on-pistachio-extract-agar
#3
Laila Aldars-García, Vicente Sanchis, Antonio J Ramos, Sonia Marín
The aim of this work was to assess the temporal relationship among quantified germination, mycelial growth and aflatoxin B1 (AFB1) production from colonies coming from single spores, in order to find the best way to predict as accurately as possible the presence of AFB1 at the early stages of contamination. Germination, mycelial growth, probability of growth and probability of AFB1 production of an isolate of Aspergillus flavus were determined at 25 °C and two water activities (0.85 and 0.87) on 3% Pistachio Extract Agar (PEA)...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28211737/poynting-robertson-like-drag-at-the-sun-s-surface
#4
Ian Cunnyngham, Marcelo Emilio, Jeff Kuhn, Isabelle Scholl, Rock Bush
The Sun's internal rotation Ω(r,Θ) has previously been measured using helioseismology techniques and found to be a complex function of colatitude θ and radius r. From helioseismology and observations of apparently "rooted" solar magnetic tracers, we know that the surface rotates more slowly than much of the interior. The cause of this slow-down is not understood, but it is important for understanding stellar rotation generally and any plausible theory of the solar interior. A new analysis using 5-min solar p-mode limb oscillations as a rotation "tracer" finds an even larger velocity gradient in a thin region at the top of the photosphere...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28211730/kinetic-turbulence-in-relativistic-plasma-from-thermal-bath-to-nonthermal-continuum
#5
Vladimir Zhdankin, Gregory R Werner, Dmitri A Uzdensky, Mitchell C Begelman
We present results from particle-in-cell simulations of driven turbulence in magnetized, collisionless, and relativistic pair plasmas. We find that the fluctuations are consistent with the classical k_{⊥}^{-5/3} magnetic energy spectrum at fluid scales and a steeper k_{⊥}^{-4} spectrum at sub-Larmor scales, where k_{⊥} is the wave vector perpendicular to the mean field. We demonstrate the development of a nonthermal, power-law particle energy distribution f(E)∼E^{-α}, with an index α that decreases with increasing magnetization and increases with an increasing system size (relative to the characteristic Larmor radius)...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28211363/nanowire-networks-and-hollow-nanospheres-of-ag-au-bimetallic-alloys-at-room-temperature
#6
R Britto Hurtado, M Cortez-Valadez, H Arizpe-Chávez, N S Flores-Lopez, Ramón A B Álvarez, M Flores-Acosta
Due to their physicochemical properties, metallic nanoalloys have potential applications in biomedicine, electrocatalysis and electrochemical sensors, among many other fields. New alternative procedures have emerged in order to reduce production costs and the use of toxic substances. In this study we present a novel low-toxicity synthesis method for the fabrication of nanowire networks (NWNs) and Ag-Au hollow nanospheres. The synthesis process is performed at room temperature without any sophisticated equipment, such as special cameras or furnaces, etc...
March 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28211292/clinical-and-functional-outcome-of-open-primary-repair-of-triangular-fibrocartilage-complex-tears-associated-with-distal-radius-fractures
#7
Faisal Johandi, Sreedharan Sechachalam
PURPOSE: We evaluate the clinical and functional outcome of open primary repair of acute TFCC tears in distal radius fracture, when there is gross intraoperative distal radioulnar joint (DRUJ) instability after fixation of the distal radius, in the absence of an ulnar styloid fracture or when the ulnar fracture fragment is too small to be fixed. METHODS: A retrospective review of our institution's distal radius fracture database over a 4-year period (January 2010 to December 2013)...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28209275/contact-kinematic-differences-between-gap-balanced-vs-measured-resection-techniques-for-single-radius-posterior-stabilized-total-knee-arthroplasty
#8
Matthew G Teeter, Kevin I Perry, Xunhua Yuan, James L Howard, Brent A Lanting
BACKGROUND: Measured resection (MR) and gap balancing (GB) are common surgical techniques for total knee arthroplasty (TKA). Controversy has arisen as each conceptually differs in how the knee is balanced through bone and soft tissue management. The objective of the present study was to compare both the frequency of condylar liftoff and the location of femorotibial contact from extension through midflexion between patients undergoing GB or MR TKA. METHODS: A total of 24 knees (23 patients) were randomly assigned at referral to either a surgeon performing MR or GB TKA with the same single radius, posterior-stabilized implant (12 per cohort)...
January 11, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28208956/a-comprehensive-study-of-internal-distraction-plating-an-alternative-method-for-distal-radius-fractures
#9
Mohit J Jain, Kinjal J Mavani
INTRODUCTION: The management of highly comminuted distal radius fractures still remains a major treatment challenge. Articular comminution and compromised bone quality are the culprits. One novel approach is the technique of Internal Distraction Plating which involves "bridging" the fracture with the use of a standard 3.5mm plate applied dorsally in distraction from the radius, proximal to the fracture, to the long finger metacarpal distally, bypassing the comminuted segment. The plate is removed once fracture union has been achieved...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28208953/open-reduction-and-volar-plate-fixation-of-dorsally-displaced-distal-radius-fractures-a-prospective-study-of-functional-and-radiological-outcomes
#10
Arjun Ballal, Anand Kumar Sadasivan, Anoop Hegde, Ashwin Shetty
INTRODUCTION: The fractures of the distal radius have always posed a unique challenge to the orthopaedic fraternity. The complex ligamentous and bony anatomy offers a wide variety of fractures to be dealt with around this zone. Over the years these injuries have become common especially in the elderly age group as well as the implants and surgical techniques have improved. AIM: To assess the radiological and functional outcome after fixation of intra-articular dorsally displaced distal radius fractures with open reduction and volar Locking Compression Plate fixation (LCP)...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28208440/charge-segregation-in-weakly-ionized-microgels
#11
John S Hyatt, Alison M Douglas, Chris Stanley, Changwoo Do, Thomas H Barker, Alberto Fernández-Nieves
We investigate microgels synthesized from N-isopropylacrylamide (NIPAM) copolymerized with a large mol% of acrylic acid, finding that when the acid groups are partially ionized at high temperatures, competition between ion-induced swelling and hydrophobic deswelling of poly(NIPAM) chains results in microphase separation. In cross-linked microgels, this manifests as a dramatic decrease in the ratio between the radius of gyration and the hydrodynamic radius to ∼0.2, indicating that almost all the mass of the microgel is concentrated near the particle center...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208413/friction-factor-for-aerosol-fractal-aggregates-over-the-entire-knudsen-range
#12
James Corson, George W Mulholland, Michael R Zachariah
We develop an approach for computing the hydrodynamic friction tensor and scalar friction coefficient for an aerosol fractal aggregate in the transition regime. Our approach involves solving the Bhatnagar-Gross-Krook equation for the velocity field around a sphere and using the velocity field to calculate the force on each primary sphere in the aggregate due to the presence of the other spheres. It is essentially an extension of Kirkwood-Riseman theory from the continuum flow regime to the entire Knudsen range (Knudsen number from 0...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208389/effect-of-curvature-on-cholesteric-liquid-crystals-in-toroidal-geometries
#13
Ana R Fialho, Nelson R Bernardino, Nuno M Silvestre, Margarida M Telo da Gama
The confinement of liquid crystals inside curved geometries leads to exotic structures, with applications ranging from biosensors to optical switches and privacy windows. Here we study how curvature affects the alignment of a cholesteric liquid crystal. We model the system on the mesoscale using the Landau-de Gennes model. Our study was performed in three stages, analyzing different curved geometries from cylindrical walls and pores, to toroidal domains, in order to isolate the curvature effects. Our results show that the stresses introduced by the curvature influence the orientation of the liquid crystal molecules, and cause distortions in the natural periodicity of the cholesteric that depend on the radius of curvature, on the pitch, and on the dimensions of the system...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208369/traffic-congestion-and-the-lifetime-of-networks-with-moving-nodes
#14
Xianxia Yang, Jie Li, Cunlai Pu, Meichen Yan, Rajput Ramiz Sharafat, Jian Yang, Konstantinos Gakis, Panos M Pardalos
For many power-limited networks, such as wireless sensor networks and mobile ad hoc networks, maximizing the network lifetime is the first concern in the related designing and maintaining activities. We study the network lifetime from the perspective of network science. In our model, nodes are initially assigned a fixed amount of energy moving in a square area and consume the energy when delivering packets. We obtain four different traffic regimes: no, slow, fast, and absolute congestion regimes, which are basically dependent on the packet generation rate...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208363/ferromagnetic-model-on-the-apollonian-packing
#15
Rafael S Oliveira, Roberto F S Andrade
This work investigates the influence of geometrical features of the Apollonian packing (AP) on the behavior of magnetic models. The proposed model differs from previous investigations on the Apollonian network (AN), where the magnetic coupling constants depend only on the properties of the network structure defined by the packing, but not on quantitative aspects of its geometry. In opposition to the exact scale invariance observed in the AN, the circle's sizes in the AP are scaled by different factors when one goes from one generation to the next, requiring a different approach for the evaluation of the model's properties...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208009/impact-of-a-newly-developed-short-double-balloon-enteroscope-on-stent-placement-in-patients-with-surgically-altered-anatomies
#16
Koichiro Tsutsumi, Hironari Kato, Hiroyuki Okada
A newly developed short double-balloon enteroscope with a working channel enlarged to a diameter of 3.2 mm is a novel innovation in stent placement for patients with surgically altered anatomies. Herein, we report three patients in whom this new scope contributed to an efficient technique and ideal treatment. In the first case, the double guidewire technique was efficient and effective for multiple stent placements. In the second case, covered self-expandable metal stent (SEMS) placement, which is the standard treatment for malignant biliary obstruction, could be performed in a technologically sound and safe manner...
February 17, 2017: Gut and Liver
https://www.readbyqxmd.com/read/28207950/simplifying-volumes-of-interest-vois-definition-in-quantitative-spect-beyond-manual-definition-of-3d-whole-organ-vois
#17
Esther M Vicente, Martin A Lodge, Steven P Rowe, Richard L Wahl, Eric C Frey
PURPOSE: We investigated the feasibility of using simpler methods than manual whole-organ volume-of-interest (VOI) definition to estimate the organ activity concentration in single photon emission computed tomography (SPECT) in cases where the activity in the organ can be assumed to be uniformly distributed on the scale of the voxel size. In particular, we investigated an anatomic region-of-interest (ROI) defined in a single transaxial slice, and a single sphere placed inside the organ boundaries...
February 16, 2017: Medical Physics
https://www.readbyqxmd.com/read/28207777/quantifying-the-value-of-perfect-information-in-emergency-vaccination-campaigns
#18
Naomi V Bradbury, William J M Probert, Katriona Shea, Michael C Runge, Christopher J Fonnesbeck, Matt J Keeling, Matthew J Ferrari, Michael J Tildesley
Foot-and-mouth disease outbreaks in non-endemic countries can lead to large economic costs and livestock losses but the use of vaccination has been contentious, partly due to uncertainty about emergency FMD vaccination. Value of information methods can be applied to disease outbreak problems such as FMD in order to investigate the performance improvement from resolving uncertainties. Here we calculate the expected value of resolving uncertainty about vaccine efficacy, time delay to immunity after vaccination and daily vaccination capacity for a hypothetical FMD outbreak in the UK...
February 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28205642/evaporation-of-inclined-water-droplets
#19
Jin Young Kim, In Gyu Hwang, Byung Mook Weon
When a drop is placed on a flat substrate tilted at an inclined angle, it can be deformed by gravity and its initial contact angle divides into front and rear contact angles by inclination. Here we study on evaporation dynamics of a pure water droplet on a flat solid substrate by controlling substrate inclination and measuring mass and volume changes of an evaporating droplet with time. We find that complete evaporation time of an inclined droplet becomes longer as gravitational influence by inclination becomes stronger...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205485/asymptomatic-flexor-tendon-damages-after-volar-locking-plate-fixation-of-distal-radius-fractures
#20
Susumu Tokunaga, Yoshihiro Abe
BACKGROUND: To investigate asymptomatic flexor tendon damages after volar locking plate fixation of distal radius fractures in 32 wrists of 32 patients with distal radius fractures fixed using two plate types. Sixteen patients received the Acu-Loc volar distal radius plate, and the remaining 16 patients received the Aptus distal radius correction plate. METHODS: The flexor pollicis longus (FPL) tendon and flexor digitorum profundus were evaluated according to intraoperative findings at plate removal...
March 2017: Journal of Hand Surgery Asian-Pacific Volume
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