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Stress fractures

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https://www.readbyqxmd.com/read/28213338/a-uniaxial-cyclic-compression-method-for-characterizing-the-rheological-and-textural-behaviors-of-mechanically-dewatered-sewage-sludge
#1
Fenglin Liang, Martial Sauceau, Gilles Dusserre, Patricia Arlabosse
The mechanically dewatered sewage sludge with total solid content around 20% on a weight basis is very similar to yield stress fluid, its complex transition between solid and fluid states is not perfectly reversible and especially challenging in terms of pumping, land spreading and drying. To characterize the rheological and textural properties of highly concentrated sludge, a specific methodology based on uniaxial single and cyclic compression tests is developed. Three types of sludge samples (fresh original, fresh premixed and aged original ones) are extruded into cylinders and pressed between two parallel plates using a material testing machine...
February 7, 2017: Water Research
https://www.readbyqxmd.com/read/28210899/interleukin-6-as-possible-early-marker-of-stress-response-after-femoral-fracture
#2
Goran Pesic, Jovana Jeremic, Tamara Nikolic, Vladimir Zivkovic, Ivan Srejovic, Aleksandra Vranic, Jovana Bradic, Branko Ristic, Aleksandar Matic, Nikola Prodanovic, Vladimir Jakovljevic
Bone fracture healing is a complex process which at best results in full recovery of function and structure of injured bone tissue, but all the mechanisms involved in this process, and their mutual interaction, are not fully understood. Despite advancement of surgical procedures, this type of fractures is still a major public health concern. In the last few decades, a lot of attention is focused on the oxygen-free radicals and inflammatory response markers as important factors of skeletal injury. Thus, the aim of the present study was to follow the changes in redox balance and inflammatory response in elderly patients with femoral fractures during the earliest stages of fracture healing, by measuring the values of the observed markers immediately after fracture, as well as the first, third, and seventh postoperative day...
February 16, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28208758/a-study-on-the-thermomechanical-reliability-risks-of-through-silicon-vias-in-sensor-applications
#3
Shuai Shao, Dapeng Liu, Yuling Niu, Kathy O'Donnell, Dipak Sengupta, Seungbae Park
Reliability risks for two different types of through-silicon-vias (TSVs) are discussed in this paper. The first is a partially-filled copper TSV, if which the copper layer covers the side walls and bottom. A polymer is used to fill the rest of the cavity. Stresses in risk sites are studied and ranked for this TSV structure by FEA modeling. Parametric studies for material properties (modulus and thermal expansion) of TSV polymer are performed. The second type is a high aspect ratio TSV filled by polycrystalline silicon (poly Si)...
February 9, 2017: Sensors
https://www.readbyqxmd.com/read/28205512/superplastic-behavior-of-silica-nanowires-obtained-by-direct-patterning-of-silsesquioxane-based-precursors
#4
Mustafa Yılmaz, Nicole Wollschläger, Mohammad Nasr Esfahani, Werner Österle, Yusuf Leblebici, B Erdem Alaca
Silica nanowires spanning 10 μm-deep trenches are fabricated from different types of silsesquioxane-based precursors by direct e-beam patterning on silicon followed by release through deep reactive ion etching. Nanowire aspect ratios as large as 150 are achieved with a critical dimension of about 50 nm and nearly rectangular cross-sections. In situ bending tests are carried out inside a scanning electron microscope, where the etch depth of 10 [Formula: see text] provides sufficient space for deformation. Silica NWs are indeed observed to exhibit superplastic behavior without fracture with deflections reaching the full etch depth, about two orders of magnitude larger than the nanowire thickness...
February 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28205458/nomenclature-classification-and-documentation-of-catastrophic-fractures-and-associated-preexisting-injuries-in-racehorses
#5
Susan M Stover
Racehorses are susceptible to bone fractures when damage from repetitive, high-magnitude loads incurred during training and racing exceed concurrent damage removal and replacement, resulting in transient periods of focal osteoporosis and bone weakening. Clinically, these events correspond to cortical stress fractures and subchondral bone stress remodeling. Evidence of these preexisting lesions include periosteal callus, endosteal callus, and intracortical focal hyperemia for cortical stress fractures; and subchondral focal hyperemia located superficial to sclerotic compacted trabecular bone tissue for subchondral stress remodeling...
February 1, 2017: Journal of Veterinary Diagnostic Investigation
https://www.readbyqxmd.com/read/28203589/prevalence-of-vitamin-d-insufficiency-in-professional-hockey-players
#6
Nima Mehran, Brian M Schulz, Brian R Neri, William J Robertson, Orr Limpisvasti
BACKGROUND: Vitamin D is a fat-soluble hormone that plays a role in bone health, muscle function, and athletic performance. Studies have shown that low levels of vitamin D can lead to slower muscle recovery and function, increased rates of stress fractures, and even poorer athletic performance. Insufficient vitamin D levels have been demonstrated in professional basketball and football players, however, there have been no studies to date reviewing vitamin D insufficiency in professional hockey players...
December 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28203048/atypical-femoral-shaft-fractures-secondary-to-long-term-bisphosphonate-therapy
#7
Cemil Kayali, Taskin Altay, Firat Ozan, Serkan Sozkesen, Kamil Yamak
BACKGROUND: Bisphosphonates (BPs) are one of the most commonly used agents in the treatment of post-menopausal osteoporosis and other metabolic bone diseases. METHODS: Between 2010 and 2015, data of 22 osteoporotic women with femoral fractures due to low-energy trauma who received BPs previously were analysed. RESULTS: The mean duration of BP therapy was 7.6 years. The mean duration of union was 7.4 months. Five patients had non-union. Stress reaction was observed in the contralateral femur in 11 patients...
June 2017: Journal of Orthopaedics
https://www.readbyqxmd.com/read/28202221/elastoplasty-as-a-promising-novel-technique-vertebral-augmentation-with-an-elastic-silicone-based-polymer
#8
Alessandro Gasbarrini, Riccardo Ghermandi, Yunus Emre Akman, Marco Girolami, Stefano Boriani
OBJECTIVE: Percutaneous vertebroplasty with polymethylmethacrylate (PMMA) restores the stiffness and the strength of fractured vertebral bodies, but changes the pattern of the stress transfer. This effect may cause a secondary fracture of the adjacent vertebrae. Elastoplasty has emerged as a new technique to overcome this complication. The aim of this study is to retrospectively evaluate the clinical results of the elastoplasty procedure. MATERIALS AND METHODS: Thirthy nine patients (9 males, 30 females, 87 spinal levels) were clinically evaluated pre and postoperatively in terms of pain relief, leakage and silicone embolism...
February 12, 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28202056/normal-gastric-emptying-time-of-a-carbohydrate-rich-drink-in-elderly-patients-with-acute-hip-fracture-a-pilot-study
#9
Per M Hellström, Bodil Samuelsson, Amer N Al-Ani, Margareta Hedström
BACKGROUND: Guidelines for fasting in elderly patients with acute hip fracture are the same as for other trauma patients, and longer than for elective patients. The reason is assumed stress-induced delayed gastric emptying with possible risk of pulmonary aspiration. Prolonged fasting in elderly patients may have serious negative metabolic consequences. The aim of our study was to investigate whether the preoperative gastric emptying was delayed in elderly women scheduled for surgery due to acute hip fracture...
February 15, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/28194713/use-of-compressive-osseointegration-endoprostheses-for-massive-bone-loss-from-tumor-and-failed-arthroplasty-a-viable-option-in-the-upper-extremity
#10
Krista A Goulding, Adam Schwartz, Steven J Hattrup, R Lor Randall, Donald Lee, Damian M Rispoli, Daniel M Lerman, Christopher Beauchamp
BACKGROUND: Endoprostheses using principles of compressive osseointegration have shown good survivorship in several studies involving the lower extremity; however, no series to our knowledge have documented the use of this technology in the management of massive bone loss in the upper limb. QUESTIONS/PURPOSES: (1) What proportion of upper extremity implants using compressive osseointegration fixation principles achieved durable short-term fixation, and what were the modes of failure? (2) What surgical complications resulted from reconstruction using this technique? METHODS: A multiinstitutional retrospective review identified nine patients (five women; four men) who underwent 13 endoprosthetic replacements between 2003 and 2014 using compressive osseointegration (Compliant(®) Pre-stress Device [CPS]; Biomet Inc, Warsaw, IN, USA) in the upper extremity, including two proximal humeri, two humeral diaphyses, seven distal humeri, and two proximal ulna...
February 13, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28192670/metal-ion-mediated-cellulose-nanofibrils-transient-network-in-covalently-cross-linked-hydrogels-mechanistic-insight-into-morphology-and-dynamics
#11
Jun Yang, Feng Xu, Chun-Rui Han
Utilization of reversible interactions as sacrificial bonds in biopolymers is critical for the integral synthesis of mechanically superior biological materials. In this work, cellulose nanofibrils (CNFs) reinforced covalent polyacrylamide (PAAm) composite hydrogels are immersed into multivalent cation (Ca2+, Zn2+, Al3+, and Ce3+) aqueous solution to form ionic association among CNFs, leading to the ionic-covalent cross-linked hydrogels. The cations promote the formation of porous networks of nanofibrils by screening the repulsive negative charges on CNF surface and dominate the mechanical properties and self-recovery efficiency of the hydrogels, resulting in mechanically reinforced ionic hydrogels with stiff (Young's modulus 257 kPa) and tough properties (fracture toughness 386 kJ/m3)...
February 13, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28192076/thermo-mechanical-stress-analysis-of-cryopreservation-in-cryobags-and-the-potential-benefit-of-nanowarming
#12
Prem Solanki, John C Bischof, Yoed Rabin
Cryopreservation by vitrification is the only promising solution for long-term organ preservation which can save millions of lives across the world. One of the challenges in cryopreservation of large-size tissues and organs is to prevent fracture formation due to the tendency of the material to contract with temperature. The current study focuses on a pillow-like shape of a cryobag, while exploring various strategies to reduce thermo-mechanical stress during the rewarming phase of the cryopreservation protocol, where maximum stresses are typically found...
February 9, 2017: Cryobiology
https://www.readbyqxmd.com/read/28190816/fracture-resistance-of-zirconia-composite-veneered-crowns-in-comparison-with-zirconia-porcelain-crowns
#13
Omar Alsadon, David Patrick, Anthony Johnson, Sarah Pollington, Duncan Wood
The objectives were to evaluate the fracture resistance and stress concentration in zirconia/composite veneered crowns in comparison to zirconia/porcelain crowns using occlusal fracture resistance and by stress analysis using finite element analysis method. Zirconia substructures were divided into two groups based on the veneering material. A static load was applied occlusally using a ball indenter and the load to fracture was recorded in Newtons (N). The same crown design was used to create 3D crown models and evaluated using FEA...
February 11, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28186860/traumatic-rib-injury-patterns-imaging-pitfalls-complications-and-treatment
#14
Brett S Talbot, Christopher P Gange, Apeksha Chaturvedi, Nina Klionsky, Susan K Hobbs, Abhishek Chaturvedi
The ribs are frequently affected by blunt or penetrating injury to the thorax. In the emergency department setting, it is vital for the interpreting radiologist to not only identify the presence of rib injuries but also alert the clinician about organ-specific injury, specific traumatic patterns, and acute rib trauma complications that require emergent attention. Rib injuries can be separated into specific morphologic fracture patterns that include stress, buckle, nondisplaced, displaced, segmental, and pathologic fractures...
February 10, 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28183665/degradation-in-the-fatigue-crack-growth-resistance-of-human-dentin-by-lactic-acid
#15
Santiago Orrego, Huakun Xu, Dwayne Arola
The oral cavity frequently undergoes localized changes in chemistry and level of acidity, which threatens the integrity of the restorative material and supporting hard tissue. The focus of this study was to evaluate the changes in fatigue crack growth resistance of dentin and toughening mechanisms caused by lactic acid exposure. Compact tension specimens of human dentin were prepared from unrestored molars and subjected to Mode I opening mode cyclic loads. Fatigue crack growth was achieved in samples from mid- and outer-coronal dentin immersed in either a lactic acid solution or neutral conditions...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28181809/two-fold-anisotropy-governs-morphological-evolution-and-stress-generation-in-sodiated-black-phosphorous-for-sodium-ion-batteries
#16
Tianwu Chen, Peng Zhao, Xu Guo, Sulin Zhang
Phosphorous represents a promising anode material for sodium ion batteries owing to its extremely high theoretical capacity. Recent in-situ transmission electron microscopy studies evidenced anisotropic swelling in sodiated black phosphorous, which may find an origin from the two intrinsic anisotropic properties inherent to the layered structure of black phosphorous: sodium diffusional directionality and insertion strain anisotropy. To understand the morphological evolution and stress generation in sodiated black phosphorous, we develop a chemo-mechanical model by incorporating the intrinsic anisotropic properties into the large elasto-plastic deformation...
February 9, 2017: Nano Letters
https://www.readbyqxmd.com/read/28178153/case-report-malignant-transformation-in-cronkhite-canada-syndrome-polyp
#17
Ye Zong, Haiying Zhao, Li Yu, Ming Ji, Yongdong Wu, Shutian Zhang
RATIONALE: Cronkhite-Canada syndrome (CCS) is a rare disease, the etiology of CCS is currently unknown. Although CCS is widely accepted as a benign disorder, the malignant potential of the polyps in CCS patients is yet controversial. PATIENT CONCERNS: A 55-year-old Chinese male was first admitted to Beijing Friendship Hospital with a 3-month history of frequent watery diarrhea (10-15 times/day), loss of taste, and a weight loss of 10 kg in August 2010. The left heel bone fracture in the patient occurred about 2 weeks prior to his diarrhea...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28174189/sternal-stress-fracture-in-a-middle-aged-woman
#18
Justin Lee, Karl Bertrand Fields
A middle-aged premenopausal woman presented with 3 months of right chest wall pain after beginning a new weight training programme. Examination was significant only for mild-to-moderate tenderness to palpation over the right pectoral muscle and sternoclavicular joint. In-office musculoskeletal ultrasound scan, chest X-ray and shoulder X-rays were unremarkable. Subsequent MRI of the chest wall showed oedema in the sternum at the level of the sternoclavicular joint consistent with a sternal stress fracture...
February 7, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28168131/radiological-and-functional-outcome-of-medial-epicondyle-fracture-treated-surgically-in-children-and-adolescents-a-retrospective-study
#19
Sagar Panthi, Kishor Khatri, Krishna Kharel, Raju Vaishya, Amit Kumar Agarwal, Vipul Vijay
PURPOSE: Fractures of the medial humeral epicondyle represent approximately 10% of all pediatric elbow fractures. Surgically treated pediatric fractures of the medial humeral epicondyle were analyzed retrospectively for their epidemiological, clinical, radiological and surgical parameters. The evaluation includes the Mayo elbow performance score (MEPS). METHODS: Twenty-five surgically treated fractures of the medial humeral epicondyle were analyzed...
January 4, 2017: Curēus
https://www.readbyqxmd.com/read/28167317/cluster-analysis-of-stress-corrosion-mechanisms-for-steel-wires-used-in-bridge-cables-through-acoustic-emission-particle-swarm-optimization
#20
Dongsheng Li, Wei Yang, Wenyao Zhang
Stress corrosion is the major failure type of bridge cable damage. The acoustic emission (AE) technique was applied to monitor the stress corrosion process of steel wires used in bridge cable structures. The damage evolution of stress corrosion in bridge cables was obtained according to the AE characteristic parameter figure. A particle swarm optimization cluster method was developed to determine the relationship between the AE signal and stress corrosion mechanisms. Results indicate that the main AE sources of stress corrosion in bridge cables included four types: passive film breakdown and detachment of the corrosion product, crack initiation, crack extension, and cable fracture...
January 18, 2017: Ultrasonics
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