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Stress fracture

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https://www.readbyqxmd.com/read/29150315/surgical-options-for-osteoporotic-vertebral-compression-fractures-complicated-with-spinal-deformity-and-neurologic-deficit
#1
Kalliopi Alpantaki, Michael Dohm, Panagiotis Korovessis, Alexander G Hadjipavlou
INTRODUCTION: This paper describes surgical options for Osteoporotic vertebral compression fracture (OVCF) with acute flexible or chronic rigid kyphosis, and pseudarthrosis complicated with pain and neurologic deficit. METHODS: This study has two components. a) A prospective clinical study of surgical treatment of 31 patients (age: 69±11 years) with either acute flexible or progressive pseudarthrotic kyphosis manifested with severe pain or neurological deficit between 2010 and 2014...
November 12, 2017: Injury
https://www.readbyqxmd.com/read/29147776/-pain-therapy-in-obstetrics
#2
J Wallenborn, I Kühnert, D O Chebac, P Kranke
Labor pains can be stronger than pain caused by fractures and as a result of fear and stress can even have a negative effect on the course of parturition. A proportion of 75% of all women in labor use one or more supportive forms of analgesia to relieve labor pains. The procedures used range from supportive non-pharmacological measures, single intramuscular or intravenous analgesics and a prolonged inhalative analgesia up to highly efficient neuraxial blocks. Non-pharmacological interventions are considered to be generally safe but poorly effective...
November 17, 2017: Der Schmerz
https://www.readbyqxmd.com/read/29146511/surgical-management-of-proximal-interphalangeal-joint-repetitive-stress-epiphyseal-fracture-nonunion-in-elite-sport-climbers
#3
Yasser El-Sheikh, Chris Lutter, Isabelle Schoeffl, Volker Schoeffl, Sascha Flohe
Repetitive stress fracture of the middle phalanx epiphysis is an injury specific to elite adolescent sport climbers. As sport climbing becomes increasingly popular in younger age groups, an increased number of these injuries have been reported in recent years. To date, treatment of these fractures has been nonsurgical, with strict rest and physiotherapy prescribed until fracture union. However, when these patients present in a delayed fashion with an established nonunion, nonsurgical treatment may fail, leading to disabling chronic pain and/or digital deformity in some cases...
November 14, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29146288/unusual-iliac-crest-stress-fracture-in-a-marathoner-a-case-report
#4
Amy M West, Kelly C McInnis
This case presentation describes a 50-year-old healthy woman who developed left sided hip pain while training for the Boston Marathon. Magnetic Resonance Imaging (MRI) demonstrates a stress fracture of the left iliac body. This injury is unique in that it did not occur in the setting of low bone mineral density and it does not fall into the current published radiographic categorization based on location of injury. This case illustrates an uncommon and atypical bone stress injury in an endurance athlete. It should be considered in the differential diagnosis of runners presenting with hip or lumbopelvic pain...
November 13, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29145408/effect-of-pulse-pressure-on-borehole-stability-during-shear-swirling-flow-vibration-cementing
#5
Zhihua Cui, Chi Ai, Lei Lv, Fangxian Yin
The shear swirling flow vibration cementing (SSFVC) technique rotates the downhole eccentric cascade by circulating cementing fluid. It makes the casing eccentrically revolve at high speed around the borehole axis. It produces strong agitation action to the annulus fluid, makes it in the state of shear turbulent flow, and results in the formation of pulse pressure which affects the surrounding rock stress. This study was focused on 1) the calculation of the pulse pressure in an annular turbulent flow field based on the finite volume method, and 2) the analysis of the effect of pulse pressure on borehole stability...
2017: PloS One
https://www.readbyqxmd.com/read/29141673/a-customized-fixation-plate-with-novel-structure-designed-by-topological-optimization-for-mandibular-angle-fracture-based-on-finite-element-analysis
#6
Yun-Feng Liu, Ying-Ying Fan, Xian-Feng Jiang, Dale A Baur
BACKGROUND: The purpose of this study was to design a customized fixation plate for mandibular angle fracture using topological optimization based on the biomechanical properties of the two conventional fixation systems, and compare the results of stress, strain and displacement distributions calculated by finite element analysis (FEA). METHODS: A three-dimensional (3D) virtual mandible was reconstructed from CT images with a mimic angle fracture and a 1 mm gap between two bone segments, and then a FEA model, including volume mesh with inhomogeneous bone material properties, three loading conditions and constraints (muscles and condyles), was created to design a customized plate using topological optimization method, then the shape of the plate was referenced from the stress concentrated area on an initial part created from thickened bone surface for optimal calculation, and then the plate was formulated as "V" pattern according to dimensions of standard mini-plate finally...
November 15, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29140377/influence-of-the-prosthetic-index-on-fracture-resistance-of-morse-taper-dental-implants
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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