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https://www.readbyqxmd.com/read/29342153/the-impact-of-optic-nerve-and-related-characteristics-on-disc-area-measurements-derived-from-different-imaging-techniques
#1
Michael Yapp, George Rennie, Michael P Hennessy, Michael Kalloniatis, Barbara Zangerl
PURPOSE: Optic nerve head (ONH) assessment and its interpretation in healthy patients and those with glaucoma remains a pivotal topic specifically considering rapid advancements in imaging technologies. We undertook a large-scale, mixed cohort, comparative study to assess the correlation of optic disc measurements between different imaging modalities and investigated the impact of patient and disc associated parameters. METHODS: ONH sizes were obtained from one randomly selected eye of each of 209 patients using stereophotography, confocal scanning laser ophthalmoscopy and two different optical coherence tomographers (OCT)...
2018: PloS One
https://www.readbyqxmd.com/read/29342067/there-is-no-column-a-new-classification-for-acetabular-fractures
#2
Amir Herman, Shay Tenenbaum, Vladislav Ougortsin, Nachshon Shazar
BACKGROUND: The surgical treatment of acetabular fractures relies on the understanding of fracture architecture and their classification. The Judet and Letournel classification has been the cornerstone in understanding and treating acetabular fractures. Recently, there has been growing evidence of discrepancies and incompleteness in the Judet and Letournel classification, adversely affecting its clinical use. This study describes a novel comprehensive classification system that will direct surgical approach and fixation methods...
January 17, 2018: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/29340839/the-cumulative-incidence-and-risk-factors-of-postoperative-inguinal-hernia-in-patients-undergoing-radical-prostatectomy
#3
Ja Yoon Ku, Chan Ho Lee, Won Young Park, Nam Kyung Lee, Seung Hyun Baek, Hong Koo Ha
BACKGROUND: The aim of this study is to investigate the cumulative incidence and risk factors of postoperative inguinal hernia (PIH) in patients undergoing radical prostatectomy, i.e., laparoscopic prostatectomy (LRP) and robot-assisted laparoscopic prostatectomy (RARP). METHODS: This study included 1124 patients who had undergone radical prostatectomy or transurethral resection of bladder tumor from 2011-2016. We compared the cumulative incidence of PIH in the radical prostatectomy groups (460; LRP 341, RARP 119) and the control group (664; transurethral resection of bladder tumor), and we then analyzed the risk factors (age, operative methods, previous abdominal operative history, thickness and width of external oblique muscle and rectus muscle, thickness of abdominal subcutaneous fat layer at Hesselbach's triangle level, body mass index, prostate-specific antigen, operative time, specimen weight, Gleason score, and pathology T-stage) of PIH in the radical prostatectomy groups...
January 16, 2018: International Journal of Clinical Oncology
https://www.readbyqxmd.com/read/29339848/habitual-patellar-dislocation-in-children-results-of-surgical-treatment-by-modified-four-in-one-technique
#4
Ravi Mittal, Avtar Singh Balawat, Vikrant Manhas, Amit Roy, Navin Kumar Singh
Background: Habitual patellar dislocation is a rare condition affecting children. The growth plates are open in children and any surgical intervention should take that in to consideration. We are describing a modified four in one technique for habitual patellar dislocation, which is a soft tissue procedure without the use of any implant. Method: In this study we included 6 children (4 females and 2 males) with open growth plates, which were diagnosed with habitual patellar dislocation...
November 2017: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/29339717/complex-reconstruction-with-flaps-after-abdominoperineal-resection-and-groin-dissection-for-anal-squamous-cell-carcinoma-a-difficult-case-involving-many-specialities
#5
Claudia Reali, Richard Guy, Christopher R Darby, Lucy Cogswell, Roel Hompes
BACKGROUND Anal squamous cell carcinoma accounts for about 2-4% of all lower gastrointestinal malignancies, with a distant disease reported in less than 5%. Although surgical treatment is rarely necessary, this often involve large dissections and difficult reconstructive procedures. CASE REPORT We present a complex but successful case of double-flap reconstruction after abdominoperineal resection and groin dissection for anal squamous cell carcinoma (cT3N3M0) with metastatic right inguinal lymph nodes and ipsilateral threatening of femoral vessels...
January 17, 2018: American Journal of Case Reports
https://www.readbyqxmd.com/read/29335780/a-comparison-of-semi-automated-volumetric-vs-linear-measurement-of-small-vestibular-schwannomas
#6
Samuel MacKeith, Tilak Das, Martin Graves, Andrew Patterson, Neil Donnelly, Richard Mannion, Patrick Axon, James Tysome
OBJECTIVE: Accurate and precise measurement of vestibular schwannoma (VS) size is key to clinical management decisions. Linear measurements are used in routine clinical practice but are prone to measurement error. This study aims to compare a semi-automated volume segmentation tool against standard linear method for measuring small VS. This study also examines whether oblique tumour orientation can contribute to linear measurement error. STUDY DESIGN: Experimental comparison of observer agreement using two measurement techniques...
January 15, 2018: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29334509/comparison-of-stress-and-strain-distribution-around-splinted-and-nonsplinted-6-mm-short-implants-in-posterior-mandible-a-finite-element-analysis-study
#7
Mansour Meimandi, Mohammad Reza Talebi Ardakani, Reza Amid, Amir Mahmoudi Motlagh, Shahrzad Beheshti
PURPOSE: This study was designed to compare the biomechanical performance of splinted and nonsplinted short implants, in the posterior mandible, using finite element analysis. MATERIALS AND METHODS: Three-dimensional models of short implants with 2 different diameters (4 × 6 mm or 5 × 6 mm) were scanned, and CATIA (R21) was used to simulate the model of an edentulous lower jaw. Experimental groups were designed as follows: (1) D4L6-splinted (three 4 × 6-mm splinted implants), (2) D4L6-nonsplinted, (3) D5L6-splinted, and (4) D5L6-nonsplinted...
January 12, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29333668/a-photonumeric-scale-for-the-assessment-of-atrophic-facial-photodamage
#8
J Ayer, A Ahmed, E Duncan-Parry, P Beck, T W Griffiths, R E B Watson, C E M Griffiths
BACKGROUND: Photonumeric scales have consistently shown superiority over descriptive equivalents. They have the advantage of providing a consistent visual frame of reference by minimising variability in perception and subjectivity. A photonumeric scale to assess hypertrophic facial photodamage already exists. However, there is currently no objective measure for atrophic facial photodamage. To address this, we have devised a nine-point photonumeric standardised scale. OBJECTIVES: To design, test and validate a photonumeric scale for the assessment of atrophic facial photodamage against a descriptive scale for the same indication...
January 15, 2018: British Journal of Dermatology
https://www.readbyqxmd.com/read/29332741/abdominal-and-pelvic-floor-electromyographic-analysis-during-abdominal-hypopressive-gymnastics
#9
Lucas Ithamar, Alberto Galvão de Moura Filho, Marco Aurélio Benedetti Rodrigues, Kelly Cristina Duque Cortez, Vinícius Gomes Machado, Claudia Regina Oliveira de Paiva Lima, Eduarda Moretti, Andrea Lemos
INTRODUCTION: Abdominal hypopressive gymnastics appeared as an alternative to traditional abdominal exercises to promote abdominal muscles strength without overloading the pelvic floor muscles (PFM). To determine the activation level of abdominal muscles and PFM and the posture influence in the level of activation in these muscles during abdominal hypopressive gymnastics, we used surface electromyography in young and healthy multipara women. METHODS: This is an observational study with eutrophic nulliparous women aged between 18 and 35 years, with abdominal skinfold less than or equal to 3 cm and active or irregularly active physical activity...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29332735/within-day-and-between-day-reliability-of-thickness-measurements-of-abdominal-muscles-using-ultrasound-during-abdominal-hollowing-and-bracing-maneuvers
#10
Mahnaz Aboufazeli, Nima Afshar-Mohajer
Ultrasonography imaging has been used as a non-invasive method to estimate the thickness and relative activities of the abdominal muscles in patients with lower back pain (LBP). However, the statistical reliability of US thickness measurements of abdominal muscles, including transversus abdominis (TrA), internal oblique (IO) and external oblique (EO) muscles during abdominal hollowing (AH) and abdominal bracing (AB) maneuvers has not been well-investigated. This study was performed on a total of 20 female subjects (10 with LBP and 10 without LBP) in the age range of 25-55 years to assess within-day and between-day reliability of the measurements...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29332305/oblique-thyroarytenoid-muscle-in-humans-an-independent-muscle-or-an-accessory-belly
#11
Shin-Hyo Lee, Ki-Seok Koh, Wu-Chul Song
OBJECTIVES/HYPOTHESIS: This study aimed to determine the prevalence and morphological variations of the oblique thyroarytenoid (TA) muscle in humans. STUDY DESIGN: Cadaveric anatomic dissections. METHODS: One hundred hemilarynges from 50 formalin-embalmed cadavers were dissected to investigate the morphology of muscle fibers of the TA muscle. RESULTS: Thirty-six (36%) hemilarynges were found to have a distinct oblique belly superficial to the TA muscle...
January 14, 2018: Laryngoscope
https://www.readbyqxmd.com/read/29332031/difference-of-the-thickness-and-activation-of-trunk-muscles-during-static-stoop-lift-at-different-loads-between-subjects-with-and-without-low-back-pain
#12
Hoe-Song Yang
BACKGROUND: Patients suffering from low back pain (LBP) have been reported to alter muscle contraction strategies. OBJECTIVE: To compare activity and thickness of the trunk muscles (external oblique (EO), internal oblique (IO), transversus abdominis (TrA), and lumbar multifidus (LM)) during static stoop lift at different lifting loads between the subjects with and without LBP. METHODS: Twenty eight subjects with LBP and twenty healthy subjects were recruited...
December 29, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/29330991/diaphyseal-nutrient-foramina-in-dried-human-adult-long-bones-of-lower-limb-in-pakistan
#13
Ejaz Afzal, Fatima Sherin, Omair Khan, Noaman Hussain Siddiqui
BACKGROUND: osteogenesis needs circulation of blood in the bones. Bone growth, repair of fracture, maintenance of bone vitality and other injures also need blood circulation in proper way. Blood is allowed to flow via holes in the diaphysis, which are called as nutrient foramina. METHODS: The crosssectional study was done in the department of Anatomy, Ayub and Khyber Medical College (Osteology Sections). The aim was to observe diaphyseal nutrient foramina in the human long bones of the lower limb...
October 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/29330634/corrective-osteotomies-using-patient-specific-3d-printed-guides-a-critical-appraisal
#14
Wouter Rosseels, Michiel Herteleer, An Sermon, Stefaan Nijs, Harm Hoekstra
INTRODUCTION: Over the last decade, the technique of 3D planning has found its way into trauma surgery. The use of this technique in corrective osteotomies for treatment of malunions provides the trauma surgeon with a powerful tool. However, this technique is not entirely straightforward. We aimed to define potential pitfalls of this technique and possible solutions to overcome these shortcomings. MATERIALS AND METHODS: Ten patients with either a uni-, bi- or triplanar malunion of the long bones were included in this study...
January 12, 2018: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/29328227/wide-angle-transmissions-of-electromagnetic-fields-through-the-sandwiched-transparent-epsilon-near-zero-metamaterial-screen
#15
Rui Yang, Pei Yang, Yongchao Chen, Jiacheng Li, Zhenya Lei
We propose a sandwiched transparent epsilon-near-zero (ENZ) metamaterial screen to release the obliquely incident electromagnetic fields. More specifically, the transmission properties through ENZ metamaterials are investigated when incorporated with an interlayer of a meta-surface having periodic complementary spiral-resonator-matrixes. We show that both TE- and TM-polarized electromagnetic waves are capable of penetrating the ENZ metamaterials under a wide-angle range of illuminations, and the greatly enhanced transmissions are turning out to be frequency dispersionless for different polarized electromagnetic fields with different incident angles...
January 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328125/multispectral-metasurface-hologram-at-millimeter-wavelengths
#16
Nicholas W Caira, David R Smith
We demonstrate a computer-generated metasurface hologram in which four distinct images are encoded at four different W-band (75-110 GHz) frequencies. The metasurface hologram consists of a planar array of resonant metamaterial elements excited by a collimated reference beam incident on the hologram at an oblique angle. Each of the images is encoded by a subset of metamaterial elements that are resonant at the specific excitation frequency and are spatially positioned to achieve a desired phase distribution in the plane in conjunction with the reference wave...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328120/broadband-perfect-infrared-absorption-by-tuning-epsilon-near-zero-and-epsilon-near-pole-resonances-of-multilayer-ito-nanowires
#17
Kun Zhou, Qiang Cheng, Jinlin Song, Lu Lu, Zhihao Jia, Junwei Li
We numerically investigate the broadband perfect infrared absorption by tuning epsilon-near-zero (ENZ) and epsilon-near-pole (ENP) resonances of multilayer indium tin oxide nanowires (ITO NWs). The monolayer ITO NWs array shows intensive absorption at ENZ and ENP wavelengths for p polarization, while only at the ENP wavelength for s polarization. Moreover, the ENP resonances are almost omnidirectional and the ENZ resonances are angularly dependent. Therefore, the absorption bandwidth is broader for p polarization than that for s polarization when polarized waves are incident obliquely...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328084/unified-and-accurate-diffraction-calculation-between-two-concentric-cylindrical-surfaces
#18
Jun Wang, Qiong-Hua Wang, Yuhen Hu
A unified and accurate fast diffraction calculation between a pair of concentric cylindrical surfaces is proposed. Analysis of the obliquity factor shows that the physical meaning of it is the projection of the unit complex amplitude in the propagation direction onto the outer normal of the observation point. Therefore, a unified and accurate diffraction calculation formula for both inside-out and outside-in propagation models is achieved. Furthermore, it is accurately accelerated by a fast calculation method using fast Fourier transformation with a speed-up over 3...
January 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29327374/dynamic-coronary-mr-angiography-in-a-pig-model-with-hyperpolarized-water
#19
Kasper Wigh Lipsø, Esben Søvsø Szocska Hansen, Rasmus Stilling Tougaard, Christoffer Laustsen, Jan Henrik Ardenkjaer-Larsen
PURPOSE: To investigate dynamic coronary MR angiography using hyperpolarized water as a positive contrast agent. Hyperpolarization can increase the signal by several orders of magnitude, and has recently been translated to human cardiac application. The aim was to achieve large 1 H signal enhancement to allow high-resolution imaging of the coronary arteries. METHODS: Protons in D2 O were hyperpolarized by dissolution dynamic nuclear polarization. A total of 18 mL of hyperpolarized water was injected into the coronary arteries of healthy pigs (N = 9; 3 injections in 3 animals)...
January 12, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29326269/exposed-subsurface-ice-sheets-in-the-martian-mid-latitudes
#20
Colin M Dundas, Ali M Bramson, Lujendra Ojha, James J Wray, Michael T Mellon, Shane Byrne, Alfred S McEwen, Nathaniel E Putzig, Donna Viola, Sarah Sutton, Erin Clark, John W Holt
Thick deposits cover broad regions of the Martian mid-latitudes with a smooth mantle; erosion in these regions creates scarps that expose the internal structure of the mantle. We investigated eight of these locations and found that they expose deposits of water ice that can be >100 meters thick, extending downward from depths as shallow as 1 to 2 meters below the surface. The scarps are actively retreating because of sublimation of the exposed water ice. The ice deposits likely originated as snowfall during Mars' high-obliquity periods and have now compacted into massive, fractured, and layered ice...
January 12, 2018: Science
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