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Stress fractures

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https://www.readbyqxmd.com/read/28088122/a-comparative-study-on-the-effects-of-ultrathin-luminescent-graphene-oxide-quantum-dot-goqd-and-graphene-oxide-go-nanosheets-on-the-interfacial-interactions-and-mechanical-properties-of-an-epoxy-composite
#1
B Karimi, B Ramezanzadeh
The reinforcement effect of graphene oxide nanosheets on the mechanical properties of an epoxy coating has been extensively studied. However, the effect of graphene oxide quantum dot (GOQD) as a new unique carbon based nanomaterial (with lateral dimension of 5-6nm and thickness of one carbon atom) on the mechanical properties of epoxy coating has not been reported and compared with GO yet. So this study aims at fabrication of a high-performance polymer composite with unique mechanical properties using GOQD nanosheets...
January 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28087211/the-effect-of-bone-growth-onto-massive-prostheses-collars-in-protecting-the-implant-from-fracture
#2
Paul Fromme, Gordon W Blunn, William J Aston, Tasneem Abdoola, Jacob Koris, Melanie J Coathup
Limb-sparing distal femoral endoprotheses used in cancer patients have a high risk of aseptic loosening. It had been reported that young adolescent patients have a higher rate of loosening and fatigue fracture of intramedullary stems because the implant becomes undersized as patients grow. Extracortical bone growth into the grooved hydroxyapatite-coated collar had been shown to reduce failure rates. The stresses in the implant and femur have been calculated from Finite Element models for different stages of bone growth onto the collar...
January 10, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28081005/mechanical-properties-and-failure-behavior-of-phosphorene-with-grain-boundaries
#3
V Sorkin, Y W Zhang
Using the density-functional tight-binding method, we studied the effect of grain boundaries on the mechanical properties and failure behavior of phosphorene. We found that the high-angle tilt boundaries with a higher density of (5∣7) defect pairs (oriented along the armchair direction) are stronger than the low-angle tilt boundaries with a lower defect density, and similarly the high-angle boundaries with a higher density of (4∣8) defect pairs (oriented along the zigzag direction) are stronger than the low-angle boundaries with a lower defect density...
January 12, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28079916/adolescent-shin-pain
#4
Jeremy Korsh, Douglas Matijakovich, Charles Gatt
Shin pain is a common complaint in adolescent athletes. The term "shin splints" has historically been applied to these patients. Shin splints, more often than not, refers to a stress reaction of the tibia from overuse. Overuse injuries occur when repetitive microtrauma to the bone exceeds the biologic healing potential. Diagnosis is based on typical history and physical examination findings. Plain radiographs and advanced imaging are rarely necessary but can provide valuable prognostic information. Treatment consists of adequate rest and exercise modification...
January 1, 2017: Pediatric Annals
https://www.readbyqxmd.com/read/28079306/open-dislocation-of-ankle-without-fracture-treated-with-an-external-fixator
#5
Emrah Sayit, Asli Tanrivermis Sayit, Elcin Zan
Ankle dislocations are orthopedic emergencies that require immediate treatment to avoid neurovascular impairment. They are usually accompanied by one or more comminuted fractures of the ankle mortis. In rare circumstances, such as high-energy trauma, the ankle dislocations may not be accompanied by concomitant malleolar fractures and, thus, are named "pure ankle dislocations". We presented a very rare and interesting case of an open medial dislocation of the ankle without associated fracture in an 18-year-old man with no known predisposing risk factors...
January 12, 2017: Orthopaedic Surgery
https://www.readbyqxmd.com/read/28073376/treatment-and-outcome-prognosis-of-patients-with-high-energy-transsyndesmotic-ankle-fracture-dislocation-the-logsplitter-injury
#6
Zhe Wang, Xin Tang, Shenglong Li, Xiuhui Wang, Liangfeng Gong, Tao Zhong, Kunzheng Wang
BACKGROUND: This study aimed to retrospectively review the clinical efficacy of open reduction and internal fixation (ORIF) for treatment of high-energy transsyndesmotic ankle fracture dislocation-the "Logsplitter" injury. METHODS: Between December 2006 and December 2014, 41 patients (29 males and 12 females; mean age, 41.46 ± 13.42 years) with Logsplitter injury were treated by ORIF procedure. Patients were grouped as typical injury (mainly vertical axial stress) and untypical injury (mainly rotational stress) according to the injury mechanism and the degree of the talus wedged into the distal tibiofibular joint...
January 10, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28072472/sonographic-findings-of-chondral-avulsion-fractures-of-the-lateral-ankle-ligaments-in-children
#7
Manabu Maeda, Nana Maeda, Takanori Takaoka, Yasuhito Tanaka
In this series, we aimed to describe the sonographic findings of chondral avulsion fractures that develop concomitant with lateral ankle ligament injury in children. We performed stress sonography during a manual anterior drawer stress procedure of the ankle in 9 skeletally immature patients who had recently had a lateral ankle sprain. Echo videos were obtained through the course of treatment, and all videos were reviewed. We elucidated the common features of chondral avulsion fractures of the lateral ankle ligaments in the children...
January 10, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28070561/the-discovery-of-a-conjugate-system-of-faults-in-the-wharton-basin-intraplate-deformation-zone
#8
Satish C Singh, Nugroho Hananto, Yanfang Qin, Frederique Leclerc, Praditya Avianto, Paul E Tapponnier, Helene Carton, Shengji Wei, Adam B Nugroho, Wishnu A Gemilang, Kerry Sieh, Sylvain Barbot
The deformation at well-defined, narrow plate boundaries depends on the relative plate motion, but how the deformation takes place within a distributed plate boundary zone remains a conundrum. This was confirmed by the seismological analyses of the 2012 great Wharton Basin earthquakes [moment magnitude (Mw) 8.6], which suggested the rupture of several faults at high angles to one another. Using high-resolution bathymetry and seismic reflection data, we report the discovery of new N294°E-striking shear zones, oblique to the plate fabric...
January 2017: Science Advances
https://www.readbyqxmd.com/read/28067732/stress-fractures
#9
Keri L Denay
No abstract text is available yet for this article.
January 2017: Current Sports Medicine Reports
https://www.readbyqxmd.com/read/28067582/the-relationship-of-hip-muscle-performance-to-leg-ankle-and-foot-injuries-a-systematic-review
#10
Nili Steinberg, Gali Dar, Martin Dunlop, James Edmund Gaida
OBJECTIVES: Hip control affects movement and muscle firing patterns in the leg, ankle and foot, and may contribute to overuse injuries. Muscle performance can be measured as strength, endurance or muscle activation patterns. Our objective was to systematically review whether hip muscle performance is associated with leg, ankle and foot injuries. DATA SOURCES: A structured and comprehensive search of six medical literature databases was combined with forward and backward citation tracking (AMED, CINAHL, EMBASE, Medline, Scopus and SportDiscus)...
January 9, 2017: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/28064103/why-do-some-titanium-alloy-total-hip-arthroplasty-modular-necks-fail
#11
Samo K Fokter, Andrej Moličnik, Rajko Kavalar, Primož Pelicon, Rebeka Rudolf, Nenad Gubeljak
BACKGROUND: Increased modularity in total hip arthroplasty (THA) through extra junction between the neck and the femoral stem is gaining popularity among orthopaedic community. However, the advantage of the additional junction is shadowed by an increased risk of mechanical failure. The aim of this study was to describe the exact mechanism of fracture of the modular femoral neck in an uncemented stem. METHODS: Clinical, metallurgical, and mechanical analysis including finite-element modelling and elemental-sensitive tissue analysis with the micro-PIXE method was performed on two patients treated with fully modular primary THA made from Titanium alloy of the same oval taper-cone design...
December 27, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28058967/the-value-of-computed-tomography-in-detecting-distal-radio-ulnar-joint-instability-after-a-distal-radius-fracture
#12
R H van Leerdam, M M E Wijffels, M Reijnierse, W Stomp, P Krijnen, I B Schipper
: This study evaluated the value of computed tomography scans for the diagnosis of distal radioulnar joint instability. A total of 46 patients, conservatively treated for a unilateral distal radius fracture, were evaluated. Clinical instability was tested using the stress test and clunk test. A computed tomography scan of both wrists was performed in pronation and supination. Two independent observers reviewed the computed tomography scans using: the radioulnar line, subluxation ratio, epicentre and radioulnar ratio methods...
January 1, 2017: Journal of Hand Surgery, European Volume
https://www.readbyqxmd.com/read/28053382/a-novel-adjustable-dynamic-plate-for-treatment-of-long-bone-fractures-an-in-vitro-biomechanical-study
#13
Ahmet Karakasli, Nihat Acar, Ahmet Karaarslan, Fatih Ertem, Hasan Havitcioglu
INTRODUCTION: Locking compression plate (LCP) system was designed to provide bone stability and to enhance bone healing. However, implant failure, nonunion and instability are still frequently encountered complications. The purpose of this study was to assess and compare the biomechanical characteristics of a novel adjustable dynamic plate (ADP) with the commonly used LCP. MATERIALS AND METHODS: Twelve 4th generation composite artificial femoral bones were used...
October 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28051983/rapid-magnetic-resonance-imaging-evaluation-of-femoral-neck-stress-fractures-in-a-u-s-active-duty-military-population
#14
Lauren A May, Dillon C Chen, Liem T Bui-Mansfield, Seth D O'Brien
OBJECTIVES: Timely diagnosis of femoral neck stress fractures is important to prevent fracture completion and displacement. We hypothesize that an abbreviated magnetic resonance imaging (MRI) hip examination can diagnose femoral neck stress fractures and that femoral neck stress fractures are common in U.S. military recruits. METHODS: We retrospectively reviewed abbreviated hip MRI examinations performed on active duty patients from November 1, 2013, to August 5, 2014...
January 2017: Military Medicine
https://www.readbyqxmd.com/read/28050549/bilateral-stress-fracture-of-femoral-neck-in-non-athlete-case-report
#15
Ubiratan Stefani de Oliveira, Pedro José Labronici, André João Neto, Alexandre Yukio Nishimi, Robinson Esteves Santos Pires, Luiz Henrique Penteado Silva
Bilateral stress fracture of femoral neck in healthy young patients is an extremely rare entity, whose diagnostic and treatment represent a major challenge. Patients with history of hip pain, even non-athletes or military recruits, should be analyzed to achieve an early diagnosis and prevent possible complications from the surgical treatment. This report describes a 43-year-old male patient, non-athlete, without previous diseases, who developed bilateral stress fracture of femoral neck without displacement...
November 2016: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28038689/outcomes-of-optimal-distraction-forces-and-frequencies-in-growth-rod-surgery-for-different-types-of-scoliotic-curves-an-in-silico-and-in%C3%A2-vitro-study
#16
Aakash Agarwal, Anand K Agarwal, Arvind Jayaswal, Vijay K Goel
OBJECTIVE: Analyze the effects of the distraction forces and frequencies on multiple representative scoliotic curves and to establish a relationship between high distraction forces and screw loosening. STUDY DESIGN: Multiple representative finite-element models of a juvenile scoliotic spine were used to study the effects of the magnitude and frequency of distraction on growth rods. METHODS: Simulation of 6 months of growth under various distraction forces to analyze the effects of distraction forces on the biomechanics of the scoliotic spine and growth rod instrumentation; simulation of 24 months of growth under various intervals of distraction to analyze the effects of the distraction interval on the propensity for rod fracture; in vitro study to assess screw loosening after 6 months...
January 2017: Spine Deformity
https://www.readbyqxmd.com/read/28038316/association-of-the-female-athlete-triad-risk-assessment-stratification-to-the-development-of-bone-stress-injuries-in-collegiate-athletes
#17
Adam S Tenforde, Jennifer L Carlson, Audrey Chang, Kristin L Sainani, Rebecca Shultz, Jae Hyung Kim, Phil Cutti, Neville H Golden, Michael Fredericson
BACKGROUND: The female athlete triad (referred to as the triad) contributes to adverse health outcomes, including bone stress injuries (BSIs), in female athletes. Guidelines were published in 2014 for clinical management of athletes affected by the triad. PURPOSE: This study aimed to (1) classify athletes from a collegiate population of 16 sports into low-, moderate-, and high-risk categories using the Female Athlete Triad Cumulative Risk Assessment score and (2) evaluate the predictive value of the risk categories for subsequent BSIs...
December 1, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28035908/plantar-pressures-increase-with-raising-body-weight-a-standardised-approach-with-paired-sample-using-neutral-shoes
#18
T Hotfiel, H D Carl, F Wendler, A Jendrissek, R Heiß, B Swoboda
BACKGROUND: Plantar pressure leads to stress on plantar tissue and can be seen as risk factor for metatarsal stress fractures or plantar ulcers and is associated with prolonged and complicated recurrence of existing tissue damages. A clear demarcation of a systematic raise of body load regarding its effect on plantar pressure has not been described. OBJECTIVE: Assessing plantar pressure in different conditions of body weight, comparing data to initial body weight...
December 23, 2016: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28028448/a-novel-technique-to-repair-a-transverse-sacral-fracture-in-a-previously-fused-lumbosacral-spondylolisthesis
#19
Thomas Noh, Mokbel K Chedid
BACKGROUND: Transverse fractures of the sacrum are rare, and surgical treatment for these fractures ranges from conservative to challenging. Transverse stress fractures of the sacrum after placement of lumbar-to-sacral instrumentation have been previously described. We report a new technique to repair a transverse Type-2 Roy-Camille fracture with spondylolisthesis of S1 over S2 in a previously fused instrumented high-grade L4-L5, L5-S1 spondylolisthesis. CASE DESCRIPTION: A 64-year-old female who previously had an L4-L5, L5-S1 fusion for spondylolisthesis presented with excruciating lower back pain and radiculopathy for over 6 months...
2016: Surgical Neurology International
https://www.readbyqxmd.com/read/28026207/impact-sports-and-bone-fractures-among-adolescents
#20
Kyle R Lynch, Han C G Kemper, Bruna Turi-Lynch, Ricardo R Agostinete, Igor H Ito, Rafael Luiz-De-Marco, Mario A Rodrigues-Junior, Rômulo A Fernandes
The objective of the present study was to investigate the effects of different sports on stress fractures among adolescents during a 9-month follow-up period. The sample was composed of 184 adolescents divided into three groups (impact sports [n = 102]; swimming [n = 35]; non-sports [n = 47]). The occurrence of stress fracture was reported by participants and coaches. As potential confounders we considered age, sex, resistance training, body composition variables and age at peak of height velocity. There were 13 adolescents who reported fractures during the 9-month period...
December 27, 2016: Journal of Sports Sciences
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