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Stress fractures

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https://www.readbyqxmd.com/read/28641745/long-term-stability-of-an-injection-molded-zirconia-bone-level-implant-a-testing-protocol-considering-aging-kinetics-and-dynamic-fatigue
#1
Benedikt C Spies, Madeleine E Maass, Erik Adolfsson, Valter Sergo, Tobias Kiemle, Christoph Berthold, Elisa Gurian, Stefano Fornasaro, Kirstin Vach, Ralf-Joachim Kohal
OBJECTIVE: Separately addressing the fatigue resistance (ISO 14801, evaluation of final product) and aging behavior (ISO 13356, standardized sample) of oral implants made from yttria-stabilized zirconia proved to be insufficient in verifying their long-term stability, since (1) implant processing is known to significantly influence transformation kinetics and (2) aging, up from a certain level, is liable to decrease fatigue resistance. Therefore, the aim of this investigation was to apply a new testing protocol considering environmental conditions adequately inducing aging during dynamic fatigue...
June 19, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28638348/the-redox-balance-in-erythrocytes-plasma-and-periosteum-of-patients-with-titanium-fixation-of-the-jaw
#2
Jan Borys, Mateusz Maciejczyk, Adam J Krȩtowski, Bozena Antonowicz, Wioletta Ratajczak-Wrona, Ewa Jabłońska, Piotr Załęski, Danuta Waszkiel, Jerzy R Ładny, Piotr Żukowski, Anna Zalewska
Titanium miniplates and screws are commonly used for fixation of jaw fractured or osteotomies. Despite the opinion of their biocompatibility, in clinical practice symptoms of chronic inflammation around the fixation develop in some patients, even many years after the application of miniplates and screws. The cause of these complications is still an unanswered question. Taking into account that oxidative stress is one of the toxic action of titanium, we have evaluated the antioxidant barrier as well as oxidative stress in the erythrocytes, plasma and periosteum covering the titanium fixation of the jaw...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28634742/outcomes-of-coronoid-first-repair-in-terrible-triad-injuries-of-the-elbow
#3
Junren Zhang, Mark Tan, Ernest Beng Kee Kwek
BACKGROUND: Clinical outcomes of terrible triad injuries (TTIs) of the elbow are historically poor. To date, it is still debatable whether the coronoid needs to be fixed and if so, how and in which sequence. METHODOLOGY: Between 2010 and 2013, 13 patients were treated surgically for acute TTIs of the elbow at a Tertiary Level 1 Trauma Centre by a single surgeon, using a standardized protocol, which included coronoid-brachialis complex fixation via pull-through trans-osseous sutures, radial head fixation or prosthetic replacement and a repair of the lateral ulnar collateral ligament...
June 20, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28633800/two-view-gravity-stress-imaging-protocol-for-nondisplaced-type-ii-supination-external-rotation-ankle-fractures-introducing-the%C3%A2-gravity%C3%A2-stress-cross-table-lateral-view
#4
Troy J Boffeli, Rachel C Collier, Samuel J Gervais
Assessing ankle stability in nondisplaced Lauge-Hansen supination external rotation type II injuries requires stress imaging. Gravity stress mortise imaging is routinely used as an alternative to manual stress imaging to assess deltoid integrity with the goal of differentiating type II from type IV injuries in cases without a posterior or medial fracture. A type II injury with a nondisplaced fibula fracture is typically treated with cast immobilization, and a type IV injury is considered unstable and often requires operative repair...
July 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28632662/treatment-of-incomplete-jones-fractures-with-low-intensity-pulsed-ultrasound-lipus
#5
Tateishi Tomohiko, Tsuyoshi Nagase, Teruhiko Nakagawa, Tsuchiya Masamitsu
OBJECTIVE: Stress fractures of the proximal epiphysis of the fifth metatarsal bone (termed Jones fracture) frequently occur in both senior high-school-age and older contestant-level soccer players, and its incidence in Japanese soccer players is higher than that in European players. Surgery is most commonly indicated for a complete fracture, and about 3 months are required before the patient is able to return to the sport. We have performed a "Jones fracture screening" to reduce the incidence of these fractures...
July 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28631937/the-effect-of-the-sagittal-ridge-angle-on-cartilage-stress-in-the-equine-metacarpo-phalangeal-fetlock-joint
#6
Helen Liley, Helen Davies, Elwyn Firth, Thor Besier, Justin Fernandez
Fatigue failure of bones of the metacarpo-phalangeal (fetlock, MCP) joint is common in thoroughbred racehorses. Stresses within the fetlock joint cartilages are affected by the morphology of the third metacarpal bone (MC3) and proximal phalangeal bone, and the steepness of the median sagittal ridge of MC3 is believed to be associated with fracture. This study investigated the influence of the steepness of the sagittal ridge on cartilage stress distribution using a finite element model of the joint. Changes to the steepness of the sagittal ridge were made by applying a parabolic function to the mesh, creating four different models with sagittal ridge angles ranging from 95° to 105°...
June 15, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28631069/-s2-ala-iliac-screws-for-extended-pelvic-fixation-in-longer-lumbar-instrumentations-description-of-a-freehand-technique
#7
REVIEW
F Lattig, S Weckbach
OBJECTIVE: To reduce the rate of implant failures at the lumbosacral junction in polysegmental lumbar fusions. INDICATIONS: Spinal fusion with deformity correction including L5/S1, revision surgery for pseudoarthrosis L5/S1, screw pull-out and pedicle fractures in S1, and S1/S2 fractures after polysegmental fusions. CONTRAINDICATIONS: Osteosynthesis of complex pelvic ring fractures, tumors of the ilium. Relative contraindication: infection, to avoid contamination of the iliosacral joint...
June 19, 2017: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/28630909/dynamic-fracture-of-tantalum-under-extreme-tensile-stress
#8
Bruno Albertazzi, Norimasa Ozaki, Vasily Zhakhovsky, Anatoly Faenov, Hideaki Habara, Marion Harmand, Nicholas Hartley, Denis Ilnitsky, Nail Inogamov, Yuichi Inubushi, Tetsuya Ishikawa, Tetsuo Katayama, Takahisa Koyama, Michel Koenig, Andrew Krygier, Takeshi Matsuoka, Satoshi Matsuyama, Emma McBride, Kirill Petrovich Migdal, Guillaume Morard, Haruhiko Ohashi, Takuo Okuchi, Tatiana Pikuz, Narangoo Purevjav, Osami Sakata, Yasuhisa Sano, Tomoko Sato, Toshimori Sekine, Yusuke Seto, Kenjiro Takahashi, Kazuo Tanaka, Yoshinori Tange, Tadashi Togashi, Kensuke Tono, Yuhei Umeda, Tommaso Vinci, Makina Yabashi, Toshinori Yabuuchi, Kazuto Yamauchi, Hirokatsu Yumoto, Ryosuke Kodama
The understanding of fracture phenomena of a material at extremely high strain rates is a key issue for a wide variety of scientific research ranging from applied science and technological developments to fundamental science such as laser-matter interaction and geology. Despite its interest, its study relies on a fine multiscale description, in between the atomic scale and macroscopic processes, so far only achievable by large-scale atomic simulations. Direct ultrafast real-time monitoring of dynamic fracture (spallation) at the atomic lattice scale with picosecond time resolution was beyond the reach of experimental techniques...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28630834/van-neck-odelberg-disease-a-rare-case-report
#9
Amit Prakash Chaudhari, Gautam Shah, Sameer Sanjeev Patil, Aashish Babanrao Ghodke, Sagar B Kelkar
INTRODUCTION: Pain in groin without any history of trauma or positive clinical findings of infection or stress fracture in ischiopubic ramus poses challenges in diagnosis of the condition in prepubertal age. "Osteochondrosis of ischiopubic synchondrosis (IPS)" also called as "Van Neck-Odelberg" disease. Left leg dominant patient presented with pain in groin and limping with left leg dominance. Differential diagnosis - such as stress fractures, osteomyelitis, tuberculosis, post-traumatic osteolysis, or any neoplasia - is need be ruled out to arrive at diagnosis...
January 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28630637/evaluation-of-circulating-srage-in-osteoporosis-according-to-bmi-adipokines-and-fracture-risk-a-pilot-observational-study
#10
Emanuela Galliera, Monica Gioia Marazzi, Carmine Gazzaruso, Pietro Gallotti, Adriana Coppola, Tiziana Montalcini, Arturo Pujia, Massimiliano M Corsi Romanelli
BACKGROUND: Osteoporosis is a systemic metabolic disease based on age-dependent imbalance between the rates of bone formation and bone resorption. Recent studies on the pathogenesis of this disease identified that bone remodelling impairment, at the base of osteoporotic bone fragility, could be related to protein glycation, in association to oxidative stress. The glycation reactions lead to the generation of glycation end products (AGEs) which, in turn, accumulates into bone, where they binds to the receptor for AGE (RAGE)...
2017: Immunity & Ageing: I & A
https://www.readbyqxmd.com/read/28629739/twisting-cracks-in-bouligand-structures
#11
Nobphadon Suksangpanya, Nicholas A Yaraghi, David Kisailus, Pablo Zavattieri
The Bouligand structure, which is found in many biological materials, is a hierarchical architecture that features uniaxial fiber layers assembled periodically into a helicoidal pattern. Many studies have highlighted the high damage-resistant performance of natural and biomimetic Bouligand structures. One particular species that utilizes the Bouligand structure to achieve outstanding mechanical performance is the smashing Mantis Shrimp, Odontodactylus Scyllarus (or stomatopod). The mantis shrimp generates high speed, high acceleration blows using its raptorial appendage to defeat highly armored preys...
June 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28623825/application-of-static-fatigue-testing-to-the-behavior-of-absorbable-sutures
#12
J L Prati, D H Kim, M J Matthewson
Absorbable sutures, since their conception, have become the dominant method for surgical wound closure and are constantly being improved. However, despite their years of service, not all aspects of their performance are fully understood. In particular, suture absorption is usually characterized by immersing the suture in a model in vitro environment under zero stress followed by measurement of the residual tensile strength as a function of immersion time. When in use, absorbable sutures are exposed to mechanical stress, which may affect the absorption rate; however, this phenomenon has not been adequately studied...
June 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28621279/comparative-evaluation-of-stress-developed-on-rotary-retreatment-instruments-during-retrieval-of-gutta-percha
#13
Dhanasekaran Sihivahanan, T Vinay Kumar Reddy, Anchu Rachel Thomas, Natarajan Senthilnathan, Murali Sivakumar, Sushmita Shivanna
AIM: The aim of the study is to compare the maximum stress distribution on the rotary retreatment instruments within the root canal at cervical, middle, and the apical one-third during retreatment of gutta-percha. MATERIALS AND METHODS: A human mandibular premolar was scanned, and three-dimensional geometry of the root was reconstructed using finite element analysis (FEA) software package (ANSYS). The basic model was kept unchanged; tooth models were created using the same dimensions and divided into two groups as follows: Group I: ProTaper Universal retreatment system and group II: Mtwo rotary retreatment system...
June 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28619021/treatment-of-thoracolumbar-burst-fractures-by-short-segment-pedicle-screw-fixation-using-a-combination-of-two-additional-pedicle-screws-and-vertebroplasty-at-the-level-of-the-fracture-a-finite-element-analysis
#14
Jen-Chung Liao, Weng-Pin Chen, Hao Wang
BACKGROUND: Traditional one-above and one-below four-screw posterior short-segment instrumentation is used for unstable thoracolumbar burst fractures. However, this method has a high rate of implant failure and early loss of reduction. The purpose of this study was to use finite element (FE) analysis to determine the effect of treating thoracolumbar burst fractures by short-segment pedicle screw fixation using a combination of two additional pedicle screws and vertebroplasty at the level of the fracture...
June 15, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28618337/biomechanical-study-of-different-fixation-techniques-for-the-treatment-of-sacroiliac-joint-injuries-using-finite-element-analyses-and-biomechanical-tests
#15
Chian-Her Lee, Ching-Chi Hsu, Po-Yuang Huang
The pelvis is one of the most stressed areas of the human musculoskeletal system due to the transfer of truncal loads to the lower extremities. Sacroiliac joint injury may lead to abnormal joint mechanics and an unstable pelvis. Various fixation techniques have been evaluated and discussed. However, it may be difficult to investigate each technique due to variations in bone quality, bone anatomy, fracture pattern, and fixation location. Additionally, the finite element method is one useful technology that avoids these variations...
June 7, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28614278/patient-specific-distraction-regimen-to-avoid-growth-rod-failure
#16
Aakash Agarwal, Arvind Jayaswal, Anand K Agarwal, Vijay K Goel
STUDY DESIGN: A finite element study to establish the relationship between patient's curve flexibility (determined using curve correction under gravity) in juvenile idiopathic scoliosis and the required distraction frequency to avoid growth rod fracture, as a function of time. OBJECTIVE: To perform a parametric analysis using a juvenile scoliotic spine model (single mid-thoracic curve with the apex at the eighth thoracic vertebra) and establish the relationship between curve flexibility (determined using curve correction under gravity) and the distraction interval that allows a higher factor of safety for the growth rods...
June 13, 2017: Spine
https://www.readbyqxmd.com/read/28608687/upconverting-nanoparticles-as-optical-sensors-of-nano-to-micro-newton-forces
#17
Alice Lay, Derek S Wang, Michael D Wisser, Randy D Mehlenbacher, Yu Lin, Miriam B Goodman, Wendy L Mao, Jennifer A Dionne
Mechanical forces affect a myriad of processes, from bone growth to material fracture to touch-responsive robotics. While nano- to micro-Newton forces are prevalent at the microscopic scale, few methods have the nanoscopic size and signal stability to measure them in vivo or in situ. Here, we develop an optical force-sensing platform based on sub-25 nm NaYF4 nanoparticles (NPs) doped with Yb(3+), Er(3+), and Mn(2+). The lanthanides Yb(3+) and Er(3+) enable both photoluminescence and upconversion, while the energetically coupled d-metal Mn(2+) adds force tunability through its crystal field sensitivity...
June 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/28608463/effect-of-etching-on-bonding-of-a-self-etch-adhesive-to-dentine-affected-by-amelogenesis-imperfecta
#18
Don Jeevanie Epasinghe, Cynthia Kar Yung Yiu
AIM: Dentine affected by amelogenesis imperfecta (AI) is histologically altered due to loss of hypoplastic enamel and becomes hypermineralized. In the present study, we examined the effect of additional acid etching on microtensile bond strength of a self-etch adhesive to AI-affected dentine. METHODS: Flat coronal dentine obtained from extracted AI-affected and non-carious permanent molars were allocated to two groups: (a) Clearfil SE Bond (control); and (b) Clearfil SE Bond and additional etching with 34% phosphoric acid for 15 seconds...
June 13, 2017: Journal of Investigative and Clinical Dentistry
https://www.readbyqxmd.com/read/28607203/hydrogen-enhanced-cracking-revealed-by-in-situ-micro-cantilever-bending-test-inside-environmental-scanning-electron-microscope
#19
Yun Deng, Tarlan Hajilou, Afrooz Barnoush
To evaluate the hydrogen (H)-induced embrittlement in iron aluminium intermetallics, especially the one with stoichiometric composition of 50 at.% Al, a novel in situ micro-cantilever bending test was applied within an environmental scanning electron microscope (ESEM), which provides both a full process monitoring and a clean, in situ H-charging condition. Two sets of cantilevers were analysed in this work: one set of un-notched cantilevers, and the other set with focused ion beam-milled notch laying on two crystallographic planes: (010) and (110)...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607189/hydrogen-enhanced-cracking-studies-on-fe-3wt-si-single-and-bi-crystal-microcantilevers
#20
T Hajilou, Y Deng, N Kheradmand, A Barnoush
Hydrogen (H) enhanced cracking was studied in Fe-3wt%Si by means of in situ electrochemical microcantilever bending test. It was clearly shown that the presence of H causes hydrogen embrittlement (HE) by triggering crack initiation and propagation at the notch where stress concentration is existing. Additionally, the effect of carbon content and the presence of a grain boundary (GB) in the cantilever were studied. It was shown that in the presence of H the effect of carbon atom on pinning the dislocations is reduced...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
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