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https://www.readbyqxmd.com/read/29053946/measurement-of-area-and-personal-breathing-zone-concentrations-of-diesel-particulate-matter-dpm-during-oil-and-gas-extraction-operations-including-hydraulic-fracturing
#1
Eric J Esswein, Marissa Alexander-Scott, John Snawder, Michael Breitenstein
Diesel engines serve many purposes in modern oil and gas extraction activities. Diesel particulate matter (DPM) emitted from diesel engines is a complex aerosol that may cause adverse health effects depending on exposure dose and duration. This study reports on personal breathing zone (PBZ) and area measurements for DPM (expressed as elemental carbon) during oil and gas extraction operations including drilling, completions (which includes hydraulic fracturing) and servicing work. Researchers at the National Institute for Occupational Safety and Health (NIOSH) collected 104 full-shift air samples (49 PBZ and 55 area) in Colorado, North Dakota, Texas, and New Mexico during a four year period from 2008-2012 The arithmetic mean (AM) of the full shift TWA PBZ samples was 10 µg/m(3); measurements ranged from 0...
October 20, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29053936/evaluation-of-an-improved-prototype-mini-baghouse-to-control-the-release-of-respirable-crystalline-silica-from-sand-movers
#2
Barbara M Alexander, Eric J Esswein, Michael G Gressel, Jerry L Kratzer, H Amy Feng, Arthur L Miller, Emanuele Cauda, Graeham Heil
The OSHA final rule on respirable crystalline silica (RCS) will require hydraulic fracturing companies to implement engineering controls to limit workers' exposure to RCS. RCS is generated by pneumatic transfer of quartz-containing sand during hydraulic fracturing operations. Chronic inhalation of RCS can lead to serious disease, including silicosis and lung cancer. NIOSH research identified at least seven sources where RCS aerosols were generated at hydraulic fracturing sites. NIOSH researchers developed an engineering control to address one of the largest sources of RCS aerosol generation, RCS escaping from thief hatches on the top of sand movers...
October 20, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29053746/external-auditory-exostoses-and-hearing-loss-in-the-shanidar-1-neandertal
#3
Erik Trinkaus, Sébastien Villotte
The Late Pleistocene Shanidar 1 older adult male Neandertal is known for the crushing fracture of his left orbit with a probable reduction in vision, the loss of his right forearm and hand, and evidence of an abnormal gait, as well as probable diffuse idiopathic skeletal hyperostosis. He also exhibits advanced external auditory exostoses in his left auditory meatus and larger ones with complete bridging across the porus in the right meatus (both Grade 3). These growths indicate at least unilateral conductive hearing (CHL) loss, a serious sensory deprivation for a Pleistocene hunter-gatherer...
2017: PloS One
https://www.readbyqxmd.com/read/29053650/quality-of-life-after-upper-third-molar-removal-a-prospective-longitudinal-study
#4
V Avellaneda-Gimeno, R Figueiredo, E Valmaseda-Castellón
BACKGROUND: Third molar extraction is a very common procedure in Dentistry. The aim of this study was to evaluate the quality of life (QoL) and satisfaction of patients undergoing extraction of an upper third molar under local anesthesia. A second objective was to describe the evolution of self-reported pain measured in a visual analogue scale (VAS) in the 7 days after surgery and its relationship with pre- and intraoperative factors. MATERIAL AND METHODS: A prospective longitudinal cohort study was made...
October 20, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/29053545/three-dimensional-deformities-of-nonoperative-midshaft-clavicle-fractures-a-surface-matching-analysis
#5
Satoshi Oki, Noboru Matsumura, Yoshimori Kiriyama, Takuji Iwamoto, Kazuki Sato, Takeo Nagura
OBJECTIVE: The purpose of this study was to describe the 3-dimensional deformities of midshaft clavicle fractures, which had been treated nonoperatively, using computed tomography (CT) surface matching. METHODS: Twenty-one patients with unilateral midshaft clavicle fracture, who had been treated nonoperatively, were enrolled and evaluated retrospectively. The 3-dimensional deformity of the fractured clavicle was evaluated by CT surface matching. CT scans of 21 age- and sex-matched patients with initial traumatic shoulder dislocation or proximal humeral fracture were enrolled as a control group, and the differences in 3-dimensional deformities and lengths of the clavicles between the fracture group and the control group were evaluated...
November 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29053544/the-correlation-between-the-ota-ao-classification-system-and-compartment-syndrome-in-both-bone-forearm-fractures
#6
Thomas S Auld, John S Hwang, Nicholas Stekas, Peter D Gibson, Michael S Sirkin, Mark C Reilly, Mark R Adams
OBJECTIVE: To evaluate the efficacy of using the Orthopaedic Trauma Association (OTA/AO) classification for both bone forearm fractures in predicting compartment syndrome. DESIGN: Retrospective cohort. SETTING: Level 1 Academic Trauma Center. PATIENTS/PARTICIPANTS: One hundred fifty-one patients 18 years of age and older, with both bone forearm fractures diagnosed from 2001 to 2016 were categorized based on the OTA/AO classification...
November 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29053543/decreased-time-to-antibiotic-prophylaxis-for-open-fractures-at-a-level-one-trauma-center
#7
Joey P Johnson, Avi D Goodman, Adam M Haag, Roman A Hayda
OBJECTIVE: To determine whether time to administration of antibiotics decreased after the implementation of an open fracture working group and antibiotic prophylaxis protocol. DESIGN: Retrospective cohort study. SETTING: One Level 1 Trauma Center. PATIENTS: Patients 18 years of age and older who sustained an open fracture and presented directly to our emergency department. INTERVENTION: Prompt irrigation and debridement in the operating room and fracture stabilization dictated by the treating surgeon...
November 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29053542/biomechanical-comparison-of-intrapelvic-and-extrapelvic-fixation-for-acetabular-fractures-involving-the-quadrilateral-plate
#8
Gregory J Gillispie, Sharon N Babcock, Kyle P McNamara, Michaela E Dimoff, Arun Aneja, Philip J Brown, Eben A Carroll
OBJECTIVES: Elderly patients represent the fastest growing and most difficult to treat population sustaining acetabular fractures. When treated surgically, isolated extrapelvic or combined intrapelvic-extrapelvic constructs may be used. No biomechanical or clinical study has compared the merits of these 2 techniques in cadaveric models. This research aims to biomechanically quantify the additional benefit of intrapelvic fixation to a standard extrapelvic fixation construct. METHODS: Ten cadaveric pelves underwent standardized anterior column and quadrilateral plate fracture creation...
November 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29053502/the-community-orthopaedic-surgeon-taking-trauma-call-pediatric-ankle-fracture-pearls-and-pitfalls
#9
Shital N Parikh, Charles T Mehlman
Pediatric ankle fractures are common and have unique fracture characteristics because of the presence of distal tibial and fibular physes. When displaced (>3 mm widening of the physis or >2 mm intra-articular gap/step-off), these fractures are typically treated with anatomical reduction and internal fixation. Computed tomography is recommended for preoperative evaluation and surgical planning for intra-articular fractures. These fractures in younger children with substantial growth remaining should be followed closely to monitor for any growth disturbance...
November 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29053501/the-community-orthopaedic-surgeon-taking-trauma-call-pediatric-tibia-fracture-pearls-and-pitfalls
#10
Steven A Lovejoy, Charles T Mehlman
Tibial fractures in children present a wide array of challenges to the managing orthopaedic surgeon. Injuries cover a spectrum from subtle tibial spine fractures to comminuted high-energy shaft fractures requiring free flap coverage. Significant risks range from malunion and leg length discrepancy to infected nonunions and Volkmann ischemic contracture. This article offers evidence and experience-based advice that is aimed at helping the community orthopaedic surgeon taking call.
November 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29053500/the-community-orthopaedic-surgeon-taking-trauma-call-pediatric-femoral-shaft-fracture-pearls-and-pitfalls
#11
J Eric Gordon, Charles T Mehlman
Pediatric femoral shaft fractures present many challenging patient care decisions. Nonoperative treatment approaches still dominate care of the youngest age groups while surgical intervention is commonplace in virtually all older children. Treatment is determined primarily by patient age as modified by clinical factors including mechanism of injury, weight, and skeletal maturity. Infants can be successfully treated by placement into a Pavlik harness, whereas children younger than 5 years are most commonly treated by early reduction and spica cast immobilization...
November 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29053499/the-community-orthopaedic-surgeon-taking-trauma-call-pediatric-supracondylar-humeral-fracture-pearls-and-pitfalls
#12
Steven L Frick, Charles T Mehlman
Supracondylar humeral fractures are the most common type of pediatric elbow fracture. With proper treatment, these injuries usually heal well and the patients return to full function. However, a small percentage of these injuries may result in devastating complications and, thus, provoke anxiety in many surgeons treating them. This article provides tips for successful management of these injuries without complications and provides references for further study.
November 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29053498/the-community-orthopaedic-surgeon-taking-trauma-call-pediatric-forearm-shaft-fracture-pearls-and-pitfalls
#13
Martin J Herman, Matthew Simon, Charles T Mehlman
Pediatric forearm shaft fractures are the third most common fracture in children, and the forearm is the third most mobile joint in the body (with a nearly 180 degree arc of motion). The goals of treatment are aimed squarely at achieving satisfactory anatomic alignment (within defined parameters) as the consequences of malunion can be permanent forearm stiffness and deformity. Nonoperative treatment approaches still dominate care of the youngest age groups while surgical intervention has become increasingly common in older children...
November 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29053497/the-community-orthopaedic-surgeon-taking-trauma-call-pediatric-phalangeal-fracture-pearls-and-pitfalls
#14
Joshua M Abzug, Charles T Mehlman
Pediatric phalangeal fractures are extremely common, especially among toddlers and older children/adolescents involved in sporting activities. The physical examination must include an assessment for deviation and malrotation. In addition, concomitant injuries must be assessed for such as tendon and/or neurovascular injuries. Plain radiographs are typically sufficient to make the diagnosis and determine the treatment. The majority of pediatric and adolescent phalangeal fractures can be treated with immobilization...
November 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29053320/interplay-between-process-zone-and-material-heterogeneities-for-dynamic-cracks
#15
Fabian Barras, Philippe H Geubelle, Jean-François Molinari
Using an elastodynamic boundary integral formulation coupled with a cohesive model, we study the problem of a dynamic rupture front propagating along an heterogeneous plane. We show that small-scale heterogeneities facilitate the supershear transition of a mode-II crack. The elastic pulses radiated during front accelerations explain how microscopic variations of fracture toughness change the macroscopic rupture dynamics. Perturbations of dynamic fronts are then systematically studied with different microstructures and loading conditions...
October 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29053276/atomic-scale-front-propagation-at-the-onset-of-frictional-sliding
#16
Silvia Bonfanti, Alessandro Taloni, Carlotta Negri, Alessandro Sellerio, Nicola Manini, Stefano Zapperi
Macroscopic frictional sliding emerges from atomic-scale interactions and processes at the contact interface, but bridging the gap between micro and macro scales still remains an unsolved challenge. Direct imaging of the contact surface and simultaneous measurement of stress fields during macroscopic frictional slip revealed the formation of crack precursors, questioning the traditional picture of frictional contacts described in terms of a single degree of freedom. Here we study the onset of frictional slip at atomic scale by simulating the motion of an aluminum block pushed by a slider on a copper substrate...
October 20, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29053258/parrotfish-teeth-stiff-biominerals-whose-microstructure-makes-them-tough-and-abrasion-resistant-to-bite-stony-corals
#17
Matthew A Marcus, Shahrouz Amini, Cayla A Stifler, Chang-Yu Sun, Nobumichi Tamura, Hans A Bechtel, Dilworth Y Parkinson, Harold S Barnard, Xiyue X X Zhang, J Q Isaiah Chua, Ali Miserez, Pupa U P A Gilbert
Parrotfish (Scaridae) feed by biting stony corals. To investigate how their teeth endure the associated contact stresses, we examine the chemical composition, nano- and micro-scale structure, and the mechanical properties of the steephead parrotfish Chlorurus microrhinos tooth. Its enameloid is a fluorapatite (Ca5(PO4)3F) biomineral with outstanding mechanical characteristics: the mean elastic modulus is 124 GPa, and the mean hardness near the biting surface is 7.3 GPa, making it among the stiffest and hardest biominerals measured; the mean indentation yield strength is above 6 GPa, and the mean fracture toughness is 2...
October 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/29053096/-scaphoid-fracture-in-a-seven-year-old-girl
#18
Ahmed Halloum, Morten Kjerri Rasmussen, Rikke Thorninger
We report a case of a seven-year-old girl, who had a scaphoid fracture, which occurred when she fell off her bicycle. She was examined in the emergency room. X-ray did not show any sign of fracture of the scaphoid, but the fracture was later verified with a magnetic resonance imaging scan. She wore a shin cast for eight weeks and recovered completely. Very few cases of children aged under eight years and diagnosed with scaphoid fracture have been reported in the literature. Scaphoid fracture should be suspected and examined for in all children with relevant trauma and symptoms, regardless of age...
October 16, 2017: Ugeskrift for Laeger
https://www.readbyqxmd.com/read/29053084/intubation-biomechanics-validation-of-a-finite-element-model-of-cervical-spine-motion-during-endotracheal-intubation-in-intact-and-injured-conditions
#19
Benjamin C Gadomski, Snehal S Shetye, Bradley J Hindman, Franklin Dexter, Brandon G Santoni, Michael M Todd, Vincent C Traynelis, Robert P From, Ricardo B Fontes, Christian M Puttlitz
OBJECTIVE Because of limitations inherent to cadaver models of endotracheal intubation, the authors' group developed a finite element (FE) model of the human cervical spine and spinal cord. Their aims were to 1) compare FE model predictions of intervertebral motion during intubation with intervertebral motion measured in patients with intact cervical spines and in cadavers with spine injuries at C-2 and C3-4 and 2) estimate spinal cord strains during intubation under these conditions. METHODS The FE model was designed to replicate the properties of an intact (stable) spine in patients, C-2 injury (Type II odontoid fracture), and a severe C3-4 distractive-flexion injury from prior cadaver studies...
October 20, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29053055/successful-surgical-repair-and-recovery-in-a-2-week-old-infant-after-birth-related-cervical-fracture-dislocation
#20
Sara Saleh, Kyle I Swanson, Taryn Bragg
Cervical spine injuries are the most common spine injuries in the pediatric population. The authors present the youngest known patient who underwent cervical spine fusion to repair birth trauma-induced cervical fracture dislocation, resulting in spondyloptosis and spinal cord injury. A 2-week-old boy was found to have spondyloptosis and spinal cord injury after concerns arose from reduced movement of the extremities. The patient's birth was complicated by undiagnosed abdominal dystocia, which led to cervical distraction injury...
October 20, 2017: Journal of Neurosurgery. Pediatrics
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