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https://www.readbyqxmd.com/read/28728078/femoral-head-necrosis-a-finite-element-analysis-of-common-and-novel-surgical-techniques
#1
Myriam Cilla, Sara Checa, Bernd Preininger, Tobias Winkler, Carsten Perka, Georg N Duda, Matthias Pumberger
BACKGROUND: Femoral head necrosis is a common cause of secondary osteoarthritis. At the early stages, treatment strategies are normally based on core decompression techniques, where the number, location and diameter of the drilling holes varies depending on the selected approach. The purpose of this study was to investigate the risk of femoral head, neck and subtrochanteric fracture following six different core decompression techniques. MATERIALS: Five common and a newly proposed techniques were analyzed in respect to their biomechanical consequences using finite element analysis...
July 6, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28727652/surgical-emphysema-following-canalplasty-for-aural-exostoses
#2
Michael C Baxter, Matthew Keller, Anil Shah, Sean Wise
OBJECTIVE: To describe the presentation and management of surgical emphysema involving the temporomandibular joint and deep neck following exostoses removal. PATIENT: A 60-year-old male surfer presented with hearing loss and recurrent infections in the right ear. An examination revealed obstructing bony exostoses in the right external auditory canal. He underwent right canalplasty using a postauricular approach. At 5 weeks after surgery, he presented with right otalgia, swelling of the right face and neck, and complaints of a squeaking noise in the right ear with mandibular excursions...
July 19, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28727557/integrating-flexible-sensor-and-virtual-self-organizing-dc-grid-model-with-cloud-computing-for-blood-leakage-detection-during-hemodialysis
#3
Ping-Tzan Huang, Tai-Lang Jong, Chien-Ming Li, Wei-Ling Chen, Chia-Hung Lin
Blood leakage and blood loss are serious complications during hemodialysis. From the hemodialysis survey reports, these life-threatening events occur to attract nephrology nurses and patients themselves. When the venous needle and blood line are disconnected, it takes only a few minutes for an adult patient to lose over 40% of his / her blood, which is a sufficient amount of blood loss to cause the patient to die. Therefore, we propose integrating a flexible sensor and self-organizing algorithm to design a cloud computing-based warning device for blood leakage detection...
July 18, 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28726244/computed-tomographic-morphometry-of-tympanic-bulla-shape-and-position-in-brachycephalic-and-mesaticephalic-dog-breeds
#4
Ben Mielke, Richard Lam, Gert Ter Haar
Anatomic variations in skull morphology have been previously described for brachycephalic dogs; however there is little published information on interbreed variations in tympanic bulla morphology. This retrospective observational study aimed to (1) provide detailed descriptions of the computed tomographic (CT) morphology of tympanic bullae in a sample of dogs representing four brachycephalic breeds (Pugs, French Bulldogs, English Bulldog, and Cavalier King Charles Spaniels) versus two mesaticephalic breeds (Labrador retrievers and Jack Russell Terriers); and (2) test associations between tympanic bulla morphology and presence of middle ear effusion...
July 20, 2017: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/28719483/difficult-intubation-and-ventilation-in-an-infant-with-retropharyngeal-abscess-with-mediastinal-extension
#5
Michael A Bruno, Tomas Drabek, Mioara D Manole
A previously healthy 7-month-old male infant presented for evaluation of fever, deceased oral intake, and intermittent noisy breathing. Physical examination revealed neck tenderness. Soft tissue neck radiographs and computed tomography (CT) scan supported a diagnosis of retropharyngeal swelling with extension to the superior mediastinum. Surgical exploration was planned, and endotracheal intubation was performed in the operating room. Significant cardiorespiratory derangements developed immediately after the tracheal tube was inserted, including hypotension, hypoxia, and bradycardia with signs of cardiac ischemia...
July 17, 2017: Pediatric Emergency Care
https://www.readbyqxmd.com/read/28718208/quantification-of-nasal-airflow-resistance-in-english-bulldogs-using-computed-tomography-and-computational-fluid-dynamics
#6
Eric T Hostnik, Brian A Scansen, Rachel Zielinski, Samir N Ghadiali
Stenotic nares, edematous intranasal turbinates, mucosal swelling, and an elongated, thickened soft palate are common sources of airflow resistance for dogs with brachycephalic airway syndrome. Surgery has focused on enlarging the nasal apertures and reducing tissue of the soft palate. However, objective measures of surgical efficacy are lacking. Twenty-one English bulldogs without previous surgery were recruited for this prospective, pilot study. Computed tomography was performed using conscious sedation and without endotracheal intubation using a 128 multidetector computed tomography scanner...
July 17, 2017: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/28718037/cost-effectiveness-of-surveillance-for-distant-recurrence-in-extremity-soft-tissue-sarcoma
#7
Trevor J Royce, Rinaa S Punglia, Aileen B Chen, Sagar A Patel, Katherine A Thornton, Chandrajit P Raut, Elizabeth H Baldini
BACKGROUND: Optimal distant recurrence (DR) surveillance strategies for extremity soft tissue sarcoma (STS) are unknown. We performed a cost-effectiveness analysis of different imaging modalities performed at guideline-specified intervals. METHODS: We developed a Markov model simulating lifetime outcomes for 54-year-old patients after definitive treatment for American Joint Committee on Cancer stage II-III extremity STS using four surveillance strategies: watchful waiting (WW), chest X-ray (CXR), chest computed tomography (CCT), and positron emission tomography-computed tomography (PET/CT)...
July 17, 2017: Annals of Surgical Oncology
https://www.readbyqxmd.com/read/28717801/mimicking-arterial-thrombosis-in-a-3d-printed-microfluidic-in-vitro-vascular-model-based-on-computed-tomography-angiography-data
#8
Pedro F Costa, Hugo J Albers, John E A Linssen, Heleen H T Middelkamp, Linda van der Hout, Robert Passier, Albert van den Berg, Jos Malda, Andries D van der Meer
Arterial thrombosis is the main instigating factor of heart attacks and strokes, which result in over 14 million deaths worldwide every year. The mechanism of thrombosis involves factors from the blood and the vessel wall, and it also relies strongly on 3D vessel geometry and local blood flow patterns. Microfluidic chip-based vascular models allow controlled in vitro studies of the interaction between vessel wall and blood in thrombosis, but until now, they could not fully recapitulate the 3D geometry and blood flow patterns of real-life healthy or diseased arteries...
July 18, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28716173/central-compartment-atopic-disease
#9
John M DelGaudio, Patricia A Loftus, Aneeza W Hamizan, Richard J Harvey, Sarah K Wise
BACKGROUND: Isolated polypoid changes of the middle turbinate were recently reported as having a high association with inhalant allergy. A more advanced manifestation of this association may present as polypoid changes of the entire central sinonasal compartment (i.e., the middle and superior turbinates, and the posterosuperior nasal septum), while the lateral sinus mucosa remains relatively normal. OBJECTIVE: To introduce and describe this newly recognized variant of chronic rhinosinusitis (CRS), termed central compartment atopic disease (CCAD)...
July 1, 2017: American Journal of Rhinology & Allergy
https://www.readbyqxmd.com/read/28713761/measurement-of-lingual-cortical-plate-thickness-and-lingual-position-of-lower-third-molar-roots-using-cone-beam-computed-tomography
#10
Anindita Mallick, K C Vidya, Akshat Waran, Sanjeeb Kumar Rout
OBJECTIVE: The objective of the study was to determine the potential risk of tooth/root displacement into the soft tissue during the third molar surgery. While performing third molar surgeries, one of the many complications is displacement of the tooth into the soft tissues. This can be due perforation of the lingual cortical bone during surgery or the position of the tooth root which may be close to the lingual bone. MATERIALS AND METHODS: Retrospective samples of 251 patients were collected who had undergone cone-beam computed tomography (CBCT) for various reasons...
June 2017: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28713118/preserving-the-bone-profile-in-anterior-maxilla-using-an-equine-cortical-bone-membrane-and-an-equine-enzyme-treated-bone-graft-a-case-report-with-5-year-follow-up
#11
Danilo A Di Stefano, Umberto Garagiola, Mirko A Bassi
AIM: This study aimed to report a well-succeeded use of equine enzyme-deantigenic cortical membrane and bone granules for guided bone regeneration (GBR) in the esthetic zone concomitant with implant placement. BACKGROUND: In the anterior maxilla, where patients typically have the highest expectations for implant-supported restorations, bone resorption in the wake of tooth loss often leads to a lack of soft tissue support and ultimately to unsatisfactory esthetic results...
July 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28712853/short-term-evaluation-of-tegumentary-changes-of-the-nose-in-oral-breathers-undergoing-rapid-maxillary-expansion
#12
Fauze Ramez Badreddine, Reginaldo Raimundo Fujita, Mario Cappellette
INTRODUCTION: Rapid maxillary expansion is an orthodontic and orthopedic procedure that can change the form and function of the nose. The soft tissue of the nose and its changes can influence the esthetics and the stability of the results obtained by this procedure. OBJECTIVE: The objective of this study was to assess the changes in nose dimensions after rapid maxillary expansion (RME) in oral breathers with maxillary atresia, using a reliable and reproducible methodology through computed tomography...
June 26, 2017: Brazilian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/28711236/temporal-bone-computed-tomography-findings-associated-with-feasibility-of-endoscopic-ear-surgery
#13
Dunia Abdul-Aziz, Elliott D Kozin, Brian M Lin, Kevin Wong, Parth V Shah, Aaron K Remenschneider, Lukas D Landegger, Amy F Juliano, Michael S Cohen, Daniel J Lee
PURPOSE: There are no formal radiologic criteria to stratify patients for transcanal (TEES) or transmastoid endoscopic ear surgery for resection of cholesteatoma. We aim to determine 1) whether standard preoperative computed tomography (CT) findings are associated with the need for conversion to a transmastoid approach and 2) the amount of time added for conversion from TEES to transmastoid techniques. MATERIALS AND METHODS: Retrospective chart review of consecutive pediatric and adult cases of TEES for primary cholesteatoma from 2013 through 2015 (n=52)...
June 14, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28711208/applications-of-dual-energy-computed-tomography-for-artifact-reduction-in-the-head-neck-and-spine
#14
REVIEW
Eric Liao, Ashok Srinivasan
Conventional computed tomography (CT) uses a polychromatic energy beam to offer superb anatomic detail of the head and spine. However, technical challenges remain that can degrade the diagnostic image quality of these examinations. Dual-energy CT analyzes the changes in attenuation of soft tissues at different energy levels, from which different reconstructions can be made to yield the optimal contrast-to-noise ratio, reduce beam-hardening artifact, or evaluate tissue composition. In this article, selective applications of the dual energy CT technique are discussed, highlighting a powerful tool in the diagnostic CT evaluation of the head, neck, and spine...
August 2017: Neuroimaging Clinics of North America
https://www.readbyqxmd.com/read/28710359/computationally-informed-design-of-a-multi-axial-actuated-microfluidic-chip-device
#15
Alessio Gizzi, Sara Maria Giannitelli, Marcella Trombetta, Christian Cherubini, Simonetta Filippi, Adele De Ninno, Luca Businaro, Annamaria Gerardino, Alberto Rainer
This paper describes the computationally informed design and experimental validation of a microfluidic chip device with multi-axial stretching capabilities. The device, based on PDMS soft-lithography, consisted of a thin porous membrane, mounted between two fluidic compartments, and tensioned via a set of vacuum-driven actuators. A finite element analysis solver implementing a set of different nonlinear elastic and hyperelastic material models was used to drive the design and optimization of chip geometry and to investigate the resulting deformation patterns under multi-axial loading...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28709225/ultra-long-range-dynamic-correlations-in-a-microscopic-model-for-aging-gels
#16
Pinaki Chaudhuri, Ludovic Berthier
We use large-scale computer simulations to explore the nonequilibrium aging dynamics in a microscopic model for colloidal gels. We find that gelation resulting from a kinetically arrested phase separation is accompanied by "anomalous" particle dynamics revealed by superdiffusive particle motion and compressed exponential relaxation of time correlation functions. Spatiotemporal analysis of the dynamics reveals intermittent heterogeneities producing spatial correlations over extremely large length scales. Our study is a microscopically resolved model reproducing all features of the spontaneous aging dynamics observed experimentally in soft materials...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28708397/shape-morphologies-of-icosahedral-two-component-vesicles
#17
Andrey G Cherstvy
What are the features of partitioning of crystalline materials on the surface of a two-component icosahedral vesicle? We model the response of the rigid hardly-stretchable crystalline icosahedra upon addition of a softer component on its surface. We demonstrate how the soft phase "invades" the shell regions with the highest elastic energy density around twelve five-fold topological defects. We explore the phase diagram of these inhomogeneous shells as a function of the soft material fraction, shell radius, and elastic moduli of the two phases...
July 14, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28706924/abdominal-aortic-aneurysm-pictorial-review-of-common-appearances-and-complications
#18
REVIEW
Yogesh Kumar, Kusum Hooda, Shuo Li, Pradeep Goyal, Nishant Gupta, Melkamu Adeb
Abdominal aortic aneurysms (AAAs) are defined as focal dilatations of the abdominal aorta that are 50% greater than the proximal normal segment or when it is more than 3 cm in maximum diameter. The early diagnosis and treatment is very important to prevent catastrophic complications. Due to its ability to assess the peri-aortic soft tissue and the exact extension of aneurysm, as well as its excellent vascular opacification and multiplanar reconstruction capabilities, computed tomography angiography (CTA) has become an integral part of the evaluation of AAA and has virtually replaced conventional angiography for the evaluation of AAA...
June 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28706825/treatment-of-irreducible-traumatic-anterior-shoulder-dislocation-caused-by-subscapularis-tendon-interposition
#19
Maysara Abdelhalim Bayoumy, Hatem G Said, Ayman Farouk Abdelkawi, Tarek N Fetih
Irreducible shoulder dislocation is an uncommon event. When it does occur, blocks to reduction can include bone, labrum, rotator cuff musculature, or tendon. Concomitant rotator cuff tear at the time of initial dislocation is not an exclusive complication of anterior shoulder dislocation in the older population. Indeed, rotator cuff tear should not be excluded based solely on the patient's age. Rotator cuff interposition is not an uncommon complication after anterior dislocation of the shoulder. It should be suspected when there is incongruency of the joint and persistent subluxation on postreduction radiographs...
June 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28706353/a-dosimetric-study-on-slab-pinewood-slab-phantom-for-developing-the-heterogeneous-chest-phantom-mimicking-actual-human-chest
#20
Om Prakash Gurjar, Radha Kishan Paliwal, Surendra Prasad Mishra
The aim is to study the density, isodose depths, and doses at different points in slab-pinewood-slab (SPS) phantom, solid phantom SP34 (made up of polystyrene), and chest level of actual patient for developing heterogeneous chest phantom mimicking thoracic region of human body. A 6 MV photon beam of field size of 10 cm × 10 cm was directed perpendicular to the surface of computed tomography (CT) images of chest level of patient, SPS phantom, and SP34 phantom. Dose was calculated using anisotropic analytical algorithm...
April 2017: Journal of Medical Physics
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