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https://www.readbyqxmd.com/read/29342966/fabrication-of-a-textile-based-wearable-blood-leakage-sensor-using-screen-offset-printing
#1
Ken-Ichi Nomura, Yoshinori Horii, Shusuke Kanazawa, Yasuyuki Kusaka, Hirobumi Ushijima
We fabricate a wearable blood leakage sensor on a cotton textile by combining two newly developed techniques. First, we employ a screen-offset printing technique that avoids blurring, short circuiting between adjacent conductive patterns, and electrode fracturing to form an interdigitated electrode structure for the sensor on a textile. Furthermore, we develop a scheme to distinguish blood from other substances by utilizing the specific dielectric dispersion of blood observed in the sub-megahertz frequency range...
January 15, 2018: Sensors
https://www.readbyqxmd.com/read/29342864/mechanical-properties-of-a-newly-additive-manufactured-implant-material-based-on-ti-42nb
#2
Christian Schulze, Markus Weinmann, Christoph Schweigel, Olaf Keßler, Rainer Bader
The application of Ti-6Al-4V alloy or commercially pure titanium for additive manufacturing enables the fabrication of complex structural implants and patient-specific implant geometries. However, the difference in Young's modulus of α + β-phase Ti alloys compared to the human bone promotes stress-shielding effects in the implant-bone interphase. The aim of the present study is the mechanical characterization of a new pre-alloyed β-phase Ti-42Nb alloy for application in additive manufacturing. The present investigation focuses on the mechanical properties of SLM-printed Ti-42Nb alloy in tensile and compression tests...
January 13, 2018: Materials
https://www.readbyqxmd.com/read/29339843/distal-radius-re-fracture-with-bending-of-implant-and-neurovascular-compromise
#3
Rafiq Kanji, James Nutt, Spiros Stavropoulos, Ahmed Elmorsy, Hank J Schneider
Peri-implant fractures of the wrist are uncommon, and usually present as stress fractures distal to the site of the implant. We report an unusual case where the radius has fractured beneath a plate, causing bending and deformity of the implant. This prevented reduction of the fracture under sedation, so urgent intervention became necessary due to neurovascular compromise.
November 2017: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/29338748/finite-element-analysis-of-intramedullary-nailing-and-double-locking-plate-for-treating-extra-articular-proximal-tibial-fractures
#4
Fancheng Chen, Xiaowei Huang, Yingsun Ya, Fenfen Ma, Zhi Qian, Jifei Shi, Shuolei Guo, Baoqing Yu
BACKGROUND: Proximal tibia fractures are one of the most familiar fractures. Surgical approaches are usually needed for anatomical reduction. However, no single treatment method has been widely established as the standard care. Our present study aims to compare the stress and stability of intramedullary nails (IMN) fixation and double locking plate (DLP) fixation in the treatment of extra-articular proximal tibial fractures. METHODS: A three-dimensional (3D) finite element model of the extra-articular proximal tibial fracture, whose 2-cm bone gap began 7 cm from the tibial plateau articular surface, was created fixed by different fixation implants...
January 16, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29337881/effects-of-polypropylene-orientation-on-mechanical-and-heat-seal-properties-of-polymer-aluminum-polymer-composite-films-for-pouch-lithium-ion-batteries
#5
Fangxinyu Zeng, Jinyao Chen, Feng Yang, Jian Kang, Ya Cao, Ming Xiang
In this study, polyamide-aluminum foil-polypropylene (PA-Al-PP) composite films with different orientation status of the PP layer were prepared, and their morphology, tensile, peeling and heat seal behavior were studied. The comparative study of tensile and fracture behaviors of single-layer film of PA, Al and PP, as well as the composite films of PA-Al, PP-Al and PA-Al-PP revealed that in PA-Al-PP composite film, the PA layer with the highest tensile strength can share the tensile stress from the Al layer during stretching, while the PP layer with the lowest tensile strength can prevent further development of the small cracks on boundary of the Al layer during stretching...
January 16, 2018: Materials
https://www.readbyqxmd.com/read/29336886/can-the-syndesmosis-procedure-prevent-metatarsus-primus-varus-and-hallux-valgus-deformity-recurrence-a-5-year-prospective-study
#6
Daniel Yiang Wu, Eddy Kwok Fai Lam
One of the main objectives of hallux valgus surgery is correction of the metatarsus primus varus deformity by osteotomy, arthrodesis, or soft tissue correction. The syndesmosis procedure uses intermetatarsal cerclage sutures to realign the first metatarsal and also induces a syndesmotic bonding between the first and second metatarsals to prevent metatarsus primus varus deformity recurrence. The purpose of the present study was to demonstrate radiologic evidence of the effectiveness of the syndesmosis concept and to identify the incidence and nature of deformity recurrence...
January 12, 2018: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29336599/femoral-neck-stress-injuries-analysis-of-156-cases-in-a-u-s-military-population-and-proposal-of-a-new-mri-classification-system
#7
Iván R Rohena-Quinquilla, Fabian J Rohena-Quinquilla, William F Scully, J Richard Lee Evanson
OBJECTIVE: The objective of this study is to formulate a new MRI classification system for fatigue-type femoral neck stress injuries (FNSIs) that is based on patient management and return-to-duty (RTD) time. MATERIALS AND METHODS: A retrospective review of 156 consecutive FNSIs in 127 U.S. Army soldiers over a 24-month period was performed. The width of marrow edema for low-grade FNSIs and the measurement of macroscopic fracture as a percentage of femoral neck width for high-grade FNSIs were recorded...
January 16, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29332029/biomechanical-effects-of-uss-fixation-with-different-screw-insertion-depths-on-the-vertebrae-stiffness-and-screw-stress-for-the-treatment-of-the-l1-fracture
#8
Jifeng Liu, Sheng Yang, Jianmin Lu, Dapeng Fu, Xipeng Liu, Depeng Shang
OBJECTIVE: To evaluate the biomechanical effects of internal fixation with different screw insertion depths on vertebrae stiffness and screw stress for L1 fracture. METHODS: The established L1 fracture was fixed with 10 different depths of screw insertion: 10-100% screw-path length (SPL). Loading on the T12 endplate was simulated. RESULTS: Screws inserted to 60-100% depths has a higher axial displacement of screw against injured vertebrae and maximum stress of screws compared to those of screws inserted to 30-50% depths and 10-20% (P< 0...
December 29, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/29326977/monitoring-reservoir-response-to-earthquakes-and-fluid-extraction-salton-sea-geothermal-field-california
#9
Taka'aki Taira, Avinash Nayak, Florent Brenguier, Michael Manga
Continuous monitoring of in situ reservoir responses to stress transients provides insights into the evolution of geothermal reservoirs. By exploiting the stress dependence of seismic velocity changes, we investigate the temporal evolution of the reservoir stress state of the Salton Sea geothermal field (SSGF), California. We find that the SSGF experienced a number of sudden velocity reductions (~0.035 to 0.25%) that are most likely caused by openings of fractures due to dynamic stress transients (as small as 0...
January 2018: Science Advances
https://www.readbyqxmd.com/read/29325026/failure-of-sternal-wires-depends-on-the-number-of-turns-and-plastic-deformation-combined-experimental-and-computational-approach
#10
Lukas Capek, Petr Henys, Martin Kalab, Pavel Solfronk
OBJECTIVES: The number of turns at the end of a wire closure is not described or discussed in any cardiosurgical guidelines. The hands-on experience of the surgeon plays a significant role. The aim of this work was to clarify the relationship between the number of turns of the suture and the resulting strength of the sternal fixation. METHODS: The study was performed in 2 independent steps. The first step was a finite element simulation, where the stress and strain distribution of the sternal fixation was observed...
January 8, 2018: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29324724/evaluation-of-oxidative-stress-levels-and-antioxidant-enzyme-activities-in-burst-fractures
#11
Fetullah Kuyumcu, Abdurrahman Aycan
BACKGROUND Spinal burst fractures are pathologies that occur in spinal injuries and cause significant mortality and morbidity as a result. Burst fractures in spinal cord injuries can result in rapid and significant oxidative stress. In addition to the primary injury in severe spinal cord injuries, subsequent secondary lesions are mainly due to inflammatory cascade activation and excessive production of free radicals. This study evaluated oxidative stress and antioxidant enzyme levels in burst fractures. MATERIAL AND METHODS Twenty patients with burst fractures were diagnosed and underwent surgery and 20 healthy control subjects were included in the study...
January 11, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29318344/severe-casualties-from-bastille-day-attack-in-nice-france
#12
Federico Solla, Joseph Carboni, Arnaud Fernandez, Audrey Dupont, Nathalie Chivoret, Gilles Brézac, Virginie Rampal, Jean Bréaud
PURPOSE: To describe the most severe casualties from the July 14th, 2016 terror attack in Nice that were treated at the Lenval University Children's Hospital (LUCH) of Nice (France). METHODS: Retrospective study about casualties treated at LUCH from Bastille Day Attack with injuries resulting in the need for surgery, resuscitation, or death. The type of lesions and surgery, duration of hospitalizations, complications, psychological status, and outcome at discharge were collected...
January 9, 2018: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/29315048/outcome-of-surgical-management-of-stress-fractures-in-high-demand-individuals
#13
C Maden, A Robbins, A Volpin, C Biz, S Konan
Stress fractures represent one-fifth of overuse injuries in sport. Successful healing of stress fractures in high demand individuals is important to prevent complications upon early return to activity. This article reviews the literature on outcomes of surgical management of stress fractures in high demand individuals. An online literature search was carried out for articles published up to and including January 2017. Twenty five papers were reviewed. In the majority of studies, no complications were reported, clinical and radiographic healing was achieved, and patients returned to their premorbid level of activity...
January 2, 2018: British Journal of Hospital Medicine
https://www.readbyqxmd.com/read/29312872/weight-bearing-cone-beam-ct-scan-versus-gravity-stress-radiography-for-analysis-of-supination-external-rotation-injuries-of-the-ankle
#14
John M Marzo, Melissa A Kluczynski, Corey Clyde, Mark J Anders, Christopher E Mutty, Christopher A Ritter
For AO 44-B2 ankle fractures of uncertain stability, the current diagnostic standard is to obtain a gravity stress radiograph, but some have advocated for the use of weight-bearing radiographs. The primary aim was to compare measures of medial clear space (MCS) on weight-bearing cone beam computed tomography (CBCT) scans versus gravity stress radiographs for determining the state of stability of ankle fractures classified as AO SER 44-B2 or Weber B. The secondary aim was to evaluate the details offered by CBCT scans with respect to other findings that may be relevant to patient care...
December 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29311022/three-dimensional-titanium-miniplates-for-fixation-of-subcondylar-mandibular-fractures-comparison-of-five-designs-using-patient-specific-finite-element-analysis
#15
Mhd Hassan Albogha, Yoshihide Mori, Ichiro Takahashi
PURPOSE: The purpose of the current study is to compare the performance of five designs of three-dimensional titanium miniplates (lambda, strut, delta, rhombic and trapezoid) for fixation of subcondylar mandibular fracture. MATERIALS AND METHODS: Three-dimensional models were constructed for the five miniplates with their screws and integrated into a virtually fractured mandible that was derived from a computed tomographic image of living human. Patient-specific finite element models were analyzed to compare the performances of the miniplates...
December 26, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29308877/improved-battery-performance-of-nano-crystalline-si-anodes-utilized-by-radio-frequency-rf-sputtered-multifunctional-amorphous-si-coating-layers
#16
In-Kyoung Ahn, Young-Joo Lee, Sekwon Na, So-Yeon Lee, Dae-Hyun Nam, Ji-Hoon Lee, Young-Chang Joo
Despite the high theoretical specific capacity of Si, commercial Li-ion batteries (LIBs) based on Si are still not feasible due to unsatisfactory cycling stability. Herein, amorphous Si (a-Si)-coated nanocrystalline Si (nc-Si) formed by versatile radio frequency (RF) sputtering systems is proposed as a promising anode material for LIBs. Compared to uncoated nc-Si (retention of 0.6% and coulombic efficiency (CE) of 79.7%), the a-Si-coated nc-Si (nc-Si@a-Si) anodes show greatly improved cycling retention (C50th/C1st) of ~ 50% and a 1st CE of 86...
January 8, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29308606/a-finite-element-analysis-of-the-stress-distribution-to-the-mandible-from-impact-forces-with-various-orientations-of-third-molars
#17
Yun-Feng Liu, Russell Wang, Dale A Baur, Xian-Feng Jiang
OBJECTIVE: To investigate the stress distribution to the mandible, with and without impacted third molars (IM3s) at various orientations, resulting from a 2000-Newton impact force either from the anterior midline or from the body of the mandible. MATERIALS AND METHODS: A 3D mandibular virtual model from a healthy dentate patient was created and the mechanical properties of the mandible were categorized to 9 levels based on the Hounsfield unit measured from computed tomography (CT) images...
2018: Journal of Zhejiang University. Science. B
https://www.readbyqxmd.com/read/29305998/effects-of-mechanical-loading-on-cortical-defect-repair-using-a-novel-mechanobiological-model-of-bone-healing
#18
Chao Liu, Robert Carrera, Vittoria Flamini, Lena Kenny, Pamela Cabahug-Zuckerman, Benson M George, Daniel Hunter, Bo Liu, Gurpreet Singh, Philipp Leucht, Kenneth A Mann, Jill A Helms, Alesha B Castillo
Mechanical loading is an important aspect of post-surgical fracture care. The timing of load application relative to the injury event may differentially regulate repair depending on the stage of healing. Here, we used a novel mechanobiological model of cortical defect repair that offers several advantages including its technical simplicity and spatially confined repair program, making effects of both physical and biological interventions more easily assessed. Using this model, we showed that daily loading (5N peak load, 2Hz, 60 cycles, 4 consecutive days) during hematoma consolidation and inflammation disrupted the injury site and activated cartilage formation on the periosteal surface adjacent to the defect...
January 4, 2018: Bone
https://www.readbyqxmd.com/read/29304957/editorial-commentary-it-s-the-fracture-not-the-fragment-that-causes-the-pain-posteromedial-elbow-impingement-in-baseball-players
#19
EDITORIAL
Shawn W O'Driscoll
Posterior impingement pain in baseball players is typically due to a fractured olecranon osteophyte. Computed tomographic (CT) scanning is the imaging of choice when evaluating posterior or posteromedial elbow pain in athletes who have subjected the elbow to excessive stresses such as occur in overhead throwing and weightlifting. Sometimes the fracture fragment can be so small that it might not be detected on plain radiographs, magnetic resonance imaging, or even at the time of arthroscopy. Symptomatic fractured olecranon osteophytes can be diagnosed clinically with the extension impingement test or arm bar test...
January 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29303320/friction-of-shear-fracture-zones
#20
T I Riikilä, J I Pylväinen, J Åström
A shear fracture of brittle solids under compression undergoes a substantial evolution from the initial microcracking to a fully formed powder-filled shear zone. Experiments covering the entire process are relatively easy to conduct, but they are very difficult to investigate in detail. Numerically, the large strain limit has remained a challenge. An efficient simulation model and a custom-made experimental device are employed to test to what extent a shear fracture alone is sufficient to drive material to spontaneous self-lubrication...
December 22, 2017: Physical Review Letters
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