keyword
MENU ▼
Read by QxMD icon Read
search

Stress fractures

keyword
https://www.readbyqxmd.com/read/29140377/influence-of-the-prosthetic-index-on-fracture-resistance-of-morse-taper-dental-implants
#1
Karla Zancopé, Caio César Dias Resende, Carolina Guimarães Castro, Rafael Calixto Salatti, Flávio Domingues das Neves
PURPOSE: Manufacturers have inserted a prosthetic index, an internal hexagon to guide prosthetic components inside Morse taper implants. However, it is still unclear if this mechanism could decrease the mechanical strength of Morse taper implants. The aim of this study was to evaluate the influence of the prosthetic index inside Morse taper implants on fracture resistance compared with nonindexed implants. MATERIALS AND METHODS: Fifty-seven Morse taper implants, with 11...
November 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29134692/water-rich-biomimetic-composites-with-abiotic-self-organizing-nanofiber-network
#2
Lizhi Xu, Xueli Zhao, Chuanlai Xu, Nicholas A Kotov
Load-bearing soft tissues, e.g., cartilage, ligaments, and blood vessels, are made predominantly from water (65-90%) which is essential for nutrient transport to cells. Yet, they display amazing stiffness, toughness, strength, and deformability attributed to the reconfigurable 3D network from stiff collagen nanofibers and flexible proteoglycans. Existing hydrogels and composites partially achieve some of the mechanical properties of natural soft tissues, but at the expense of water content. Concurrently, water-rich biomedical polymers are elastic but weak...
November 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29130656/-design-of-minimal-invasive-screw-on-posterior-pelvis-ring-and-pelvic-finite-element-analysis
#3
Fan Tang, Li Min, Yan-Ling Wang, Bo Qu, Yong Zhou, Yi Luo, Wen-Li Zhang, Rui Shi, Hong Duan, Chong-Qi Tu
OBJECTIVE: To design minimal invasive screw on posterior pelvic ring and perform threedimensional finite element analysis based on a pelvis finite element model. METHODS: We measured the pelvic anatomical data of 20 healthy volunteers and identified potential designs for minimal invasive screw on posterior pelvic ring. A finite element model of pelvis was then established. Threedimensional finite element analyses were performed under static and dynamic mechanical loading,respectively...
September 2017: Sichuan da Xue Xue Bao. Yi Xue Ban, Journal of Sichuan University. Medical Science Edition
https://www.readbyqxmd.com/read/29129460/the-association-of-novel-polymorphisms-with-stress-fracture-injury-in-elite-athletes-further-insights-from-the-sfea-cohort
#4
Ian Varley, David C Hughes, Julie P Greeves, Trent Stellingwerff, Craig Ranson, William D Fraser, Craig Sale
OBJECTIVES: To determine, in conjunction with a wider investigation, whether 11 genetic variants in the vicinity of vitamin D, collagen and Wnt signalling pathways were associated with stress fracture injury in the Stress Fracture Elite Athlete (SFEA) cohort. DESIGN: Genotype-phenotype association study. METHODS: Self-reported stress fracture history and demographic data were recorded in 518 elite athletes, 449 male and 69 female (mean age 24...
November 7, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29128216/strain-hardening-and-anisotropy-in-tensile-fracture-properties-of-sheared-model-mozzarella-cheeses
#5
Prateek Sharma, Peter A Munro, Tzvetelin T Dessev, Peter G Wiles, E Allen Foegeding
We studied the tensile fracture properties of model Mozzarella cheeses with varying amounts of shear work input (3.3-73.7 kJ/kg). After manufacture, cheeses were elongated by manual rolling at 65°C followed by tensile testing at 21°C on dumbbell-shaped samples cut both parallel and perpendicular to the rolling direction. Strain hardening parameters were estimated from stress-strain curves using 3 different methods. Fracture stress and strain for longitudinal samples did not vary significantly with shear work input up to 26...
November 8, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29122121/a-biomechanical-comparison-of-four-fixed-angle-dorsal-plates-in-a-finite-element-model-of-dorsally-unstable-radius-fracture
#6
Josip Knežević, Janoš Kodvanj, Fabijan Čukelj, Frane Pamuković, Arsen Pavić
PURPOSE: To compare the finite element models of two different composite radius fracture patterns, reduced and stabilised with four different fixed-angle dorsal plates during axial, dorsal and volar loading conditions. METHODS: Eight different plastic models representing four AO/ASIF type 23-A3 distal radius fractures and four AO/ASIF 23-C2 distal radius fractures were obtained and fixed each with 1 of 4 methods: a standard dorsal non-anatomical fixed angle T-plate (3...
November 2017: Injury
https://www.readbyqxmd.com/read/29118659/modelling-wave-induced-sea-ice-break-up-in-the-marginal-ice-zone
#7
F Montiel, V A Squire
A model of ice floe break-up under ocean wave forcing in the marginal ice zone (MIZ) is proposed to investigate how floe size distribution (FSD) evolves under repeated wave break-up events. A three-dimensional linear model of ocean wave scattering by a finite array of compliant circular ice floes is coupled to a flexural failure model, which breaks a floe into two floes provided the two-dimensional stress field satisfies a break-up criterion. A closed-feedback loop algorithm is devised, which (i) solves the wave-scattering problem for a given FSD under time-harmonic plane wave forcing, (ii) computes the stress field in all the floes, (iii) fractures the floes satisfying the break-up criterion, and (iv) generates an updated FSD, initializing the geometry for the next iteration of the loop...
October 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29115654/management-of-capitellar-fractures-with-open-reduction-and-internal-fixation-using-herbert-screws
#8
Asif Sultan, Omar Khursheed, Mohammad Rafiq Bhat, Hilal Ahmad Kotwal, Qazi Waris Manzoor
BACKGROUND: Capitellar fractures are rare elbow injuries and can cause severe limitation of function if not properly managed. Numerous treatments have evolved, from closed reduction and cast immobilization to open reduction and internal fixation (ORIF), so as to achieve a stable joint that allows early mobilization. We determined the functional outcomes of treating these fractures with ORIF using Herbert screws via an extensile lateral approach. METHODS: Fifteen patients with capitellar fractures were included in this retrospective study...
November 2017: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/29114950/inorganic-organic-double-network-gels-containing-ionic-liquids
#9
Eiji Kamio, Tomoki Yasui, Yu Iida, Jian Ping Gong, Hideto Matsuyama
Highly robust ion gels, termed double-network (DN) ion gels, composed of inorganic/organic interpenetrating networks and a large amount of ionic liquids (ILs), are fabricated. The DN ion gels with an 80 wt% IL content show extraordinarily high mechanical strength: more than 28 MPa of compressive fracture stress. In the DN ion gel preparation, a brittle inorganic network of physically bonded silica nanoparticles and a ductile organic network of polydimethylacrylamide (PDMAAm) are formed in the IL. Because of the different reaction mechanisms of the inorganic/organic networks, the DN ion gels can be formed by an easy and free-shapeable one-pot synthesis...
November 8, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29114631/bore-disruption-an-unusual-mechanical-failure-of-two-hip-hemiarthroplasties
#10
Federico Dettoni, Umberto Cottino, Silvia Spriano, Davide Edoardo Bonasia, Roberto Rossi
We report a case of two hemiarthroplasties (HAs) that underwent an unexpected mechanical failure. Two patients affected by femoral fractures were treated with an HA. At 5 and 7 years after surgery, they showed a breakage of the HA at the head-stem junction. We analyzed macroscopically and microscopically (by a scanning electron microscopy) the surfaces of the broken prostheses. In both cases, a fracture was detected starting at the joining point between the femoral head and the slot that receives the taper cone of the stem (the so-called bore), with the typical macroscopic and microscopic pattern of a fatigue fracture...
March 2017: Joints
https://www.readbyqxmd.com/read/29113700/high-performance-dental-resin-composites-with-hydrolytically-stable-monomers
#11
Xiaohong Wang, George Huyang, Sri Vikram Palagummi, Xiaohui Liu, Drago Skrtic, Carlos Beauchamp, Rafael Bowen, Jirun Sun
OBJECTIVE: The objectives of this project were to: 1) develop strong and durable dental resin composites by employing new monomers that are hydrolytically stable, and 2) demonstrate that resin composites based on these monomers perform superiorly to the traditional bisphenol A glycidyl dimethacrylate/triethylene glycol dimethacrylate (Bis-GMA/TEGDMA) composites under testing conditions relevant to clinical applications. METHODS: New resins comprising hydrolytically stable, ether-based monomer, i...
November 4, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29112917/influence-of-minor-combined-addition-of-cr-and-pr-on-microstructure-mechanical-properties-and-corrosion-behaviors-of-an-ultrahigh-strength-al-zn-mg-cu-zr-alloy
#12
Ming Wang, Lanping Huang, Kanghua Chen, Wensheng Liu
This work focuses on controlling grain boundary structure in an ultra-high strength Al-8.6Zn-2.5Mg-2.2Cu-0.16Zr (wt.%) alloy by the combined addition of trace Cr (0.1wt.%) and Pr (0.14wt.%), and evaluating mechanical properties and localized corrosion behaviors of the alloy in the peak aged condition. The introduction of trace Cr and Pr leads to the formation of nanoscale Cr, Pr-containing Al3Zr and Zr-containing PrCr2Al20 dispersoids which can obviously inhibit the recrystallization and sub-grain growth of the super-high strength Al-Zn-Mg-Cu alloys, and retain the deformation-recovery microstructure dominated by low-angle grain boundaries...
October 26, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29109996/simulational-insights-into-the-mechanical-response-of-prestretched-double-network-filled-elastomers
#13
Wenhui Wang, Zhiyu Zhang, Theodoros Davris, Jun Liu, Yangyang Gao, Liqun Zhang, Alexey V Lyulin
This paper deals with molecular-dynamics simulations of the mechanical properties of prestretched double network filled elastomers. To this end, we firstly validated the accuracy of this method, and affirmed that the produced stress-strain characteristics were qualitatively consistent with Lesser's experimental results on the prestretched tri-block copolymers with a competitive double network. Secondly, we investigated the effect of the crosslinking network ratio on the mechanical properties of the prestretched double network homopolymers under uniaxial tension...
November 7, 2017: Soft Matter
https://www.readbyqxmd.com/read/29109885/sacral-stress-fracture-in-an-amateur-badminton-player
#14
Yusuke Yuasa, Naohisa Miyakoshi, Michio Hongo, Kunio Ebata, Tatsuru Tomioka, Yoichi Shimada
Sacral stress fractures are rare among athletes but have been reported most frequently in long distance runners. We report herein the first case of a sacral stress fracture in an amateur badminton player. A 16-year-old, left-handed adolescent girl, who had just started to play badminton 3 months previously, complained of acute left buttock pain when she received a shuttlecock. Magnetic resonance imaging revealed a linear lesion of the left sacrum with low signal intensity on T1- and high signal intensity on T2-weighted images, which was consistent with a stress fracture...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/29109418/extremely-low-frequency-pulsed-electromagnetic-fields-cause-antioxidative-defense-mechanisms-in-human-osteoblasts-via-induction-of-%C3%A2-o2-and-h2o2
#15
Sabrina Ehnert, Anne-Kristin Fentz, Anna Schreiner, Johannes Birk, Benjamin Wilbrand, Patrick Ziegler, Marie K Reumann, Hongbo Wang, Karsten Falldorf, Andreas K Nussler
Recently, we identified a specific extremely low-frequency pulsed electromagnetic field (ELF-PEMF) that supports human osteoblast (hOBs) function in an ERK1/2-dependent manner, suggesting reactive oxygen species (ROS) being key regulators in this process. Thus, this study aimed at investigating how ELF-PEMF exposure can modulate hOBs function via ROS. Our results show that single exposure to ELF-PEMF induced ROS production in hOBs, without reducing intracellular glutathione. Repetitive exposure (>3) to ELF-PEMF however reduced ROS-levels, suggesting alterations in the cells antioxidative stress response...
November 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29106811/epidemiology-and-impact-on-performance-of-lower-extremity-stress-injuries-in-professional-basketball-players
#16
Moin Khan, Kim Madden, M Tyrrell Burrus, Joseph P Rogowski, Jeff Stotts, Marisa J Samani, Robby Sikka, Asheesh Bedi
BACKGROUND: Professional basketball players in the National Basketball Association (NBA) subject their lower extremities to significant repetitive loading during both regular-season and off-season training. Little is known about the incidence of lower extremity bony stress injuries and their impact on return to play and performance in these athletes. HYPOTHESIS: Stress injuries of the lower extremity will have significant impact on performance. STUDY DESIGN: Case series...
November 1, 2017: Sports Health
https://www.readbyqxmd.com/read/29101896/a-simplified-application-app-for-the-parametric-design-of-screw-plate-fixation-of-bone-fractures
#17
Chen-Yuan Chung
Screw and plate fixation is commonly used to treat bone fractures. A prototype application (APP) for presurgical simulation was developed and validated by comparing it with current analytical approach and other models. In this APP, alternative plate designs and materials to limit the effects of stress shielding could be tested. In addition, the number and position of screws and the gap between bone and plate that achieved acceptable stability were predicted. The fixation stability providing a situation of interfragmentary strain between 2% and 10% is necessary for callus formation...
November 1, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29099895/radial-shaft-stress-fracture-in-a-major-league-pitcher
#18
Karim A Meijer, Matthew S Fury, Hayley Ennis, Luis Grau, Michael Baraga, Jean Jose, James R Andrews, Lee Kaplan
Upper extremity injuries are associated with significant morbidity in throwing athletes, and prevention and diagnosis of overuse injuries in these athletes are increasingly being emphasized. Although stress fractures are common overuse injuries, stress fractures of the upper extremity are relatively rare. To our knowledge, a stress fracture of the radial shaft has not been reported in a throwing athlete. In this article, we describe the case of a Major League Baseball pitcher who presented with a stress fracture of the lateral cortex of the radius, likely caused by contractile forces of the supinator muscle, arising after his attempt to develop a new pitch...
September 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/29099893/acute-shortening-versus-bridging-plate-for-highly-comminuted-olecranon-fractures
#19
Meir Marmor, Keiko Amano, Akira Yamamoto, David Friedberg, Erik McDonald, Eric Meinberg
Severely comminuted olecranon fractures, for which elbow stability becomes the main goal of surgery, remain a challenge for surgeons. We conducted a study to determine the percentage loss of articular surface at which a bridge plating (BP) construct becomes too unstable and an acute shortening (AS) construct is required. The olecranon process of 8 fresh-frozen cadaveric upper limbs was serially resected. At each resection, the simulated fracture was fixed first with BP and then with AS. Stability was tested by performing valgus and varus stress tests at various angles under fluoroscopy...
September 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/29098851/micro-and-macromechanical-properties-of-thermoelectric-lead-chalcogenides
#20
Guodong Li, Umut Aydemir, Bo Duan, Matthias T Agne, Hongtao Wang, Max Wood, Qingjie Zhang, Pengcheng Zhai, William A Goddard, G Jeffrey Snyder
Both n- and p-type lead telluride (PbTe)-based thermoelectric (TE) materials display high TE efficiency, but the low fracture strength may limit their commercial applications. To find ways to improve these macroscopic mechanical properties, we report here the ideal strength and deformation mechanism of PbTe using density functional theory calculations. This provides structure-property relationships at the atomic scale that can be applied to estimate macroscopic mechanical properties such as fracture toughness...
November 13, 2017: ACS Applied Materials & Interfaces
keyword
keyword
12523
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"