keyword
MENU ▼
Read by QxMD icon Read
search

Stress fractures

keyword
https://www.readbyqxmd.com/read/28732217/finite-element-evaluation-of-stable-fixation-in-combined-mandibular-fractures
#1
Thalita Regina Vieira E Oliveira, Daniel Takanori Kemmoku, Jorge Vicente Lopes da Silva, Pedro Yoshito Noritomi, Luis Augusto Passeri
PURPOSE: The fixation of combined mandibular fractures, especially symphyseal-condylar fractures, although occurring commonly and having a higher complication rate in the clinic, is rarely investigated regarding predictable therapeutic approaches. Thus this study's aim was to assess different forms of condylar fixation when combined with symphyseal fracture fixation. MATERIALS AND METHODS: Using finite element models, we analyzed the stress distribution that occurs when a condylar fracture is fixed with 1 miniplate, 2 miniplates, or a trapezoidal condylar miniplate and when a symphyseal fracture is fixed with 2 parallel plates, 2 perpendicular plates, or 2 lag screws...
June 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28730248/clavicle-anatomical-osteosynthesis-plate-breakage-failure-analysis-report-based-on-patient-morphological-parameters
#2
Rodica Marinescu, Vasile Iulian Antoniac, Dan Ioan Stoia, Dan Constantin Lăptoiu
Clavicle fracture reported incidence is about 5% of fractures in adult; among them, those located in the middle third of the shaft represent more than 80% from the total of cases. Due to the special morphological and biomechanical constraints of the clavicle, several methods for restoring morphological integrity in these fractures are described, including conservative, non-surgical treatment. The last 10 years of clinical studies in the field have favored the surgical treatment for selected cases; several osteosynthesis implants are in use - mostly anatomical plates with specific advantages and documented complications...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28726191/virtual-experimental-validation-of-dynamic-osteosynthesis-in-the-treatment-of-fractures-of-the-proximal-femur
#3
V E Dubrov, I A Kuz'kin, I M Shcherbakov, A L Matveev, A V Yudin
Volume model of transtrochanteric fracture of the femoral bone fixed by Targon PF dynamic fixator was studied by the finite element analysis. The following parameters were measured: magnitude and direction of displacement of system elements, pressure between fragments, and von Mises stress distribution in the fixator depending on support screw plunging into the sleeve. The results indicate that stability of the bone-nail system increases during fracture union and 10-mm shortening of the femoral neck axis, which is seen from a decrease in system deformation under load by 16...
July 18, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28721562/reduced-energy-availability-implications-for-bone-health-in-physically-active-populations
#4
REVIEW
Maria Papageorgiou, Eimear Dolan, Kirsty J Elliott-Sale, Craig Sale
PURPOSE: The present review critically evaluates existing literature on the effects of short- and long-term low energy availability (EA) on bone metabolism and health in physically active individuals. METHODS: We reviewed the literature on the short-term effects of low EA on markers of bone metabolism and the long-term effects of low EA on outcomes relating to bone health (bone mass, microarchitecture and strength, bone metabolic markers and stress fracture injury risk) in physically active individuals...
July 18, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28720046/strain-as-a-function-of-time-in-extrinsic-wrist-ligaments-tensioned-through-external-fixation
#5
Joseph P Rectenwald, K Ashley Bentley, Peter M Murray, Subrata Saha
BACKGROUND: The objective of this study is to determine the time-dependent dissipation of extrinsic wrist ligament tension following the application external fixation with axial distraction of the wrist in a cadaveric model. METHODS: Six paired fresh-frozen cadaveric specimens underwent mechanical testing simulating external fixation with 1 arm of each pair osteotomized to simulate a distal radius fracture. The change in tension was then recorded over 24 hours. RESULTS: The rate of stress relaxation decreased with time...
February 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28719995/biomechanics-of-the-proximal-radius-following-drilling-of-the-bicipital-tuberosity-to-mimic-cortical-button-distal-biceps-repair-technique
#6
Nikhil R Oak, John R Lien, Alexander Brunfeldt, Jeffrey N Lawton
BACKGROUND: A fracture through the proximal radius is a theoretical concern after cortical button distal biceps fixation in an active patient. The permanent, nonossified cortical defect and medullary tunnel is at risk during a fall eliciting rotational and compressive forces. We hypothesized that during simulated torsion and compression, in comparison with unaltered specimens, the cortical button distal biceps repair model would have decreased torsional and compressive strength and would fracture in the vicinity of the bicipital tuberosity bone tunnel...
March 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28715639/probing-gelation-and-rheological-behavior-of-a-self-assembled-molecular-gel
#7
Seyed Meysam Hashemnejad, Santanu Kundu
Molecular gels are being investigated over the last few decades, however, mechanical behavior of these self-assembled gels is not well understood, particularly, how these materials fail at large-strain. Here, we report the gelation and rheological behavior of a molecular gel formed by self-assembly of a low molecular weight gelator (LMWG), di-Fmoc-L-lysine, in 1-propanol/water mixture. Gels were prepared by solvent-triggered technique and gelation was tracked using FTIR spectroscopy and shear rheology. FTIR spectroscopy captures the formation of hydrogen bonding between the gelator molecules and the change in IR spectra during the gelation process correlates with the gelation kinetics results captured by rheology...
July 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28714859/regrowth-mechanism-for-oxide-isolation-of-gaas-nanowires
#8
David Dvorak, Ali Darbandi, Karen L Kavanagh, Simon P Watkins
We demonstrate a lithography-free method for the oxide-isolation of GaAs NWs in which axial growth of Al2O3-coated NWs is restarted using an annealing step. NWs are grown using the vapour-liquid-solid method and continued growth at the oxide-coated nanoparticle occurs after thermally-induced fracture of the oxide during annealing. This oxide fracture is observed to depend on nanoparticle diameter, oxide thickness and annealing temperature. A thermal expansion mismatch model for stresses on the oxide shell is put forward to explain these results...
July 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28713455/a-pilot-study-of-the-effect-of-outsole-hardness-on-lower-limb-kinematics-and-kinetics-during-soccer-related-movements
#9
Dong Sun, Qichang Mei, Julien S Baker, Xuewen Jia, Yaodong Gu
The purpose of this study was to investigate the effect of different outsole hardness of turf cleats shoes on the lower limb kinematics and kinetics of soccer players playing on artificial turf. The participants were required to complete tasks of straight running and 45° left sidestep cutting movements, respectively, at the speed of 4.5 ± 0.2 m/s on artificial turf. They were asked to randomly select turf cleats shoes with a soft outsole (SO), medium hardness outsole (MO) and hard outsole (HO). During the stance phase of straight running, peak pressure and force-time integral in medial forefoot (MFF) of players wearing cleats shoes with MO were significantly higher than those wearing cleats shoes with SO...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28711410/a-retrospective-analysis-of-the-number-of-therapy-visits-after-distal-radius-fractures-using-a-new-provider-scored-clinical-severity-scale
#10
Eric Kirby, Sean Sparrow
STUDY DESIGN: Retrospective study. INTRODUCTION: Fractures of the distal radius are common as is a postfracture referral to occupational therapy (OT). This article examines factors that cause greater morbidity and a greater number of OT visits. PURPOSE OF THE STUDY: This study aims to analyze which of 5 common sequelae of the distal radius fracture is most significant for increasing the number of therapy visits. METHODS: Three-hundred Sixty charts were reviewed, and 89 were selected...
July 12, 2017: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/28708780/syndesmotic-ankle-fractures-a-systematic-review
#11
James D Michelson, Michael Wright, Michael Blankstein
OBJECTIVES: The diagnosis and treatment of syndesmotic ankle fractures is controversial. This systematic review was performed to clarify the current understanding addressing several clinical questions that arise in the treatment of such injuries DATA SOURCES:: The English language literature was searched using PubMed, EMBASE, and Web of Science. The search terms were "syndesmosis" or "syndesmotic" in combination with the terms "ankle fracture" or "fracture". The included dates were between 1967 and July 2015...
June 22, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28706786/role-of-1-5%C3%A2-mm-microplates-in-treatment-of-symphyseal-fracture-of-mandible-a-stress-analysis-based-comparative-study
#12
Syed S Ahmed, Siddharth Bhardwaj, Md Kalim Ansari, Omar Farooq, Abid Ali Khan
AIMS AND OBJECTIVES: To perform comparative finite element analysis (FEA)for 2.0 mm standard miniplate and 1.5 mm microplate in isolated symphyseal mandibular fractures. MATERIAL AND METHOD: Two FE models of mandible were developed and symphyseal fracture was created in both of them. Each fractured model was reduced and fixed using two mini plates and two microplates, respectively according Champ's principle. Stresses thus developed in the plates after application of masticatory load were observed in the models...
May 2017: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/28697074/repair-of-bimalleolar-ankle-fracture
#13
Nina Fisher, Abiola Atanda, Stephanie Swensen, Kenneth A Egol
PURPOSE: The incidence of ankle fractures is rapidly increasing in geriatric populations. Of the 4 fracture patterns described by the Lauge-Hansen classification system, supination-external rotation (SER) accounts for most ankle fractures. This video demonstrates surgical repair of a SER type 4 ankle fracture in a geriatric patient. METHODS: SER type 4 ankle fractures are considered unstable and are generally treated with surgical fixation. After placement of plate and screws, intraoperative stress tests can be used to assess for syndesmotic widening...
August 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28696958/rock-climbing-related-bone-marrow-edema-of-the-hand-a-follow-up-study
#14
Christoph Lutter, Thomas Hochholzer, Thomas Bayer, Volker Schöffl
OBJECTIVE: Sport climbers strain passive and active anatomical structures of their hands and fingers to the maximum during training or competition. This study was designed to investigate bone marrow edema (BME) in rock climbing athletes. DESIGN: Systematic detection, treatment, and follow-up investigation of rock climbing athletes with BME of the hand. SETTING: Primary-level orthopedic surgery and sports medicine division of a large academic medical center...
July 6, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28692912/effects-of-molybdenum-and-cadmium-on-the-oxidative-damage-and-kidney-apoptosis-in-duck
#15
Lele Shi, Huabin Cao, Junrong Luo, Ping Liu, Tiancheng Wang, Guoliang Hu, Caiying Zhang
Molybdenum (Mo) is an essential element for human beings and animals; however, high dietary intake of Mo can lead to adverse reactions. Cadmium (Cd) is one of the major transitional metals which has toxic effects in animals. To investigate the co-induced toxic effects of Mo and Cd on oxidative damage and kidney apoptosis in duck, 120 ducks were randomly divided into control group and 5 treatment groups which were treated with a commercial diet containing different dosages of Mo and Cd. Kidney samples were collected on the 60th and 120th days to determine the mRNA expression levels of ceruloplasmin (CP), metallothionein (MT), Bak-1, and Caspase-3 by quantitative RT-PCR...
July 7, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28692781/depression-as-a-risk-factor-of-organic-diseases-an-international-integrative-review
#16
Teodora Bica, Ruth Castelló, Loren L Toussaint, Pilar Montesó-Curto
PURPOSE AND DESIGN: This integrative review offers a systematic synthesis of the international literature regarding the role of depression as a risk factor in physical illnesses and the mechanisms of this connection. Special attention is paid to those modifiable factors. FINDINGS: Published studies of depression and physical illness and disease(N = 24) from five countries that were indexed in PubMed, the Cumulative Index to Nursing and Allied Health Literature (CINAHL), APA PsycNET, Scopus, Dialnet, and CUIDEN were examined...
July 2017: Journal of Nursing Scholarship
https://www.readbyqxmd.com/read/28691101/advancing-discontinuous-fiber-reinforced-composites-above-critical-length-for-replacing-current-dental-composites-and-amalgam
#17
Richard C Petersen
Clinicians have been aware that posterior dental particulate-filled composites (PFCs) have many placement disadvantages and indeed fail clinically at an average rate faster than amalgam alloys. Secondary caries is most commonly identified as the chief failure mechanism for both dental PFCs and amalgam. In terms of a solution, fiber-reinforced composites (FRCs) above critical length (Lc) can provide mechanical property safety factors with compound molding packing qualities to reduce many problems associated with dental PFCs...
February 2017: Journal of Nature and Science
https://www.readbyqxmd.com/read/28689821/role-of-the-lateral-collateral-ligament-in-posteromedial-rotatory-instability-of-the-elbow
#18
Enrico Bellato, Youngbok Kim, James S Fitzsimmons, Alexander W Hooke, Lawrence J Berglund, Daniel R Bachman, Shawn W O'Driscoll
BACKGROUND: Posteromedial rotatory instability (PMRI) of the elbow consists of an anteromedial coronoid fracture with lateral collateral ligament (LCL) and posterior bundle of the medial collateral ligament (PMCL) tears. We hypothesized that the LCL tear is required for elbow subluxation/joint incongruity and that an elbow affected by an anteromedial subtype 2 coronoid fracture and a PMCL tear exhibits contact pressures different from both an intact elbow and an elbow affected by PMRI...
July 6, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28687543/injury-epidemiology-of-tennis-players-at-the-2011-2016-australian-open-grand-slam
#19
Danielle T Gescheit, Stuart J Cormack, Rob Duffield, Stephanie Kovalchik, Tim O Wood, Melanie Omizzolo, Machar Reid
AIM: To examine the epidemiology and in-event treatment frequency of injury at the 2011-2016 Australian Open tournaments. METHODS: Injury incidence was defined as a medical consultation by a tournament physician and in-event treatment frequency as the mean total number of follow-up medical/physiotherapy consultations (2013-2016 tournaments only). Data were collated by sex, injury region and type and reported as frequencies per 10 000 game exposures. Incidence rate s± 95% CI and rate ratios were used to test effects for injury, sex and year...
July 7, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28686698/flow-velocity-driven-differentiation-of-human-mesenchymal-stromal-cells-in-silk-fibroin-scaffolds-a-combined-experimental-and-computational-approach
#20
Jolanda Rita Vetsch, Duncan Colin Betts, Ralph Müller, Sandra Hofmann
Mechanical loading plays a major role in bone remodeling and fracture healing. Mimicking the concept of mechanical loading of bone has been widely studied in bone tissue engineering by perfusion cultures. Nevertheless, there is still debate regarding the in-vitro mechanical stimulation regime. This study aims at investigating the effect of two different flow rates (vlow = 0.001m/s and vhigh = 0.061m/s) on the growth of mineralized tissue produced by human mesenchymal stromal cells cultured on 3-D silk fibroin scaffolds...
2017: PloS One
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"