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https://www.readbyqxmd.com/read/28646708/piezoelectric-parametric-effects-on-wave-vibration-and-contact-mechanics-of-traveling-wave-ultrasonic-motor
#1
Dongsheng Zhang, Shiyu Wang, Jie Xiu
Elastic wave quality determines the operating performance of traveling wave ultrasonic motor (TWUM). The time-variant circumferential force from the shrink of piezoelectric ceramic is one of the factors that distort the elastic wave. The distorted waveshape deviates from the ideal standard sinusoidal fashion and affects the contact mechanics and driving performance. An analytical dynamic model of ring ultrasonic motor is developed. Based on this model, the piezoelectric parametric effects on the wave distortion and contact mechanics are examined...
May 25, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28645673/supra-acetabular-line-is-better-than-supra-iliac-line-for-coronal-balance-referencing-a-study-of-perioperative-whole-spine-x-rays-in-degenerative-lumbar-scoliosis-and-ankylosing-spondylitis-patients
#2
Hwee Weng Dennis Hey, Cheung-Kue Kim, Won-Gyu Lee, Hyung-Suk Juh, Ki-Tack Kim
BACKGROUND CONTEXT: The aim of spinal deformity correction is to restore the spine's functional alignment by balancing it in both the sagittal and coronal planes. Regardless of posture, the ideal coronal profile is straight, and therefore readily assessable. PURPOSE: This study compares two radiological methods to determine which better predicts postoperative standing coronal balance. STUDY DESIGN/SETTING: We conducted a single-centre, radiographic comparative study between 2011 and 2015...
June 20, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28645590/endoscopic-supracerebellar-transtentorial-approach-to-the-atrium-of-the-lateral-ventricle-preliminary-surgical-and-optical-considerations
#3
Tao Xie, Linjun Zhou, Xiaobiao Zhang, Wei Sun, Hailin Ding, Tengfei Liu, Ye Gu, Chongjing Sun, Fan Hu, Wei Zhu
OBJECTIVE: To report the operative techniques of the endoscopic supracerebellar transtentorial approach (ESTA) to the atrium of the lateral ventricle, especially focusing on the role of the endoscope and analyzing optically related issues. METHODS: A retrospective data review was performed on five patients with lesions in the atrium of the lateral ventricle undergoing the ESTA. The patients were positioned in the three-quarters prone position, and a paramidline linear incision was used...
June 20, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28645319/architectural-frameworks-defining-the-structures-for-implementing-learning-health-systems
#4
Lysanne Lessard, Wojtek Michalowski, Michael Fung-Kee-Fung, Lori Jones, Agnes Grudniewicz
BACKGROUND: The vision of transforming health systems into learning health systems (LHSs) that rapidly and continuously transform knowledge into improved health outcomes at lower cost is generating increased interest in government agencies, health organizations, and health research communities. While existing initiatives demonstrate that different approaches can succeed in making the LHS vision a reality, they are too varied in their goals, focus, and scale to be reproduced without undue effort...
June 23, 2017: Implementation Science: IS
https://www.readbyqxmd.com/read/28644678/professional-athletes-return-to-play-and-performance-after-operative-repair-of-an-achilles-tendon-rupture
#5
David P Trofa, J Chance Miller, Eugene S Jang, Denzel R Woode, Justin K Greisberg, J Turner Vosseller
BACKGROUND: Most Achilles tendon ruptures are sports related. However, few studies have examined and compared the effect of surgical repair for complete ruptures on return to play (RTP), play time, and performance across multiple sports. PURPOSE: To examine RTP and performance among professional athletes after Achilles tendon repair and compare pre- versus postoperative functional outcomes of professional athletes from different major leagues in the United States...
June 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28643797/deep-sclerectomy-for-uveitic-glaucoma-long-term-outcomes
#6
K Mercieca, L Steeples, N Anand
PurposeTo report long-term outcomes of deep sclerectomy (DS) in eyes with raised intraocular pressure (IOP) and glaucoma secondary to uveitis.Patients and methodsRetrospective consecutive case series of 43 eyes of 43 patients with uveitic glaucoma. Mitomycin C (MMC) 0.2-0.4 mg/ml was applied sub-conjunctivally prior to scleral flap dissection for 2-3 min in 35 eyes (81%). Combined phacoemulsification and DS was done in 4 cases (9%).ResultsMean follow-up was 68.5±33.5 months. In total, 23 eyes (53.5%) had previous intraocular surgery...
June 23, 2017: Eye
https://www.readbyqxmd.com/read/28643796/benchmarking-cataract-surgery-outcomes-in-an-ethnically-diverse-and-diabetic-population-final-post-operative-visual-acuity-and-rates-of-post-operative-cystoid-macular-oedema
#7
K Oyewole, F Tsogkas, M Westcott, S Patra
PurposeTo determine visual acuity and rates of post-operative cystoid macular oedema (CMO) in an ethnically diverse and predominantly diabetic population.MethodsThe study was undertaken over a one year period. Snellen visual acuity (VA) was measured pre and 4-8 weeks post-operatively and optical coherence topography (OCT) was performed at baseline and post-operatively. No eyes received prophylactic non-steroidal anti-inflammatory drugs (NSAIDs) prior to or after surgery.ResultsOut of 262 eyes, 59% were in the Black, Asian and minority ethnic group (BAME), 57% had a history of diabetes mellitus and 34% had pre-existing diabetic retinopathy...
June 23, 2017: Eye
https://www.readbyqxmd.com/read/28643713/tissue-plasminogen-activator-assisted-vitrectomy-for-submacular-hemorrhage-due-to-age-related-macular-degeneration
#8
Mustafa Gok, V Levent Karabaş, Mehmet S Aslan, Özgür Kara, Süleyman Karaman, Fatih Yenihayat
PURPOSE: The purpose of this study was to evaluate the treatment efficacy of vitrectomy combined with subretinal recombinant tissue plasminogen activator (r-tPA) and factors affecting visual improvement in patients with submacular hemorrhage (SMH) due to neovascular age-related macular degeneration (nAMD). MATERIALS AND METHODS: Medical records of 17 consecutive patients diagnosed with SMH secondary to nAMD were retrospectively reviewed. The initial surgical procedure involved a 23-gauge transconjunctival vitrectomy, subretinal r-tPA application through a self-sealing inferior retinotomy, and sulfur hexafluoride gas for tamponade in all patients...
June 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28643102/post-operative-rotator-cuff-integrity-based-on-sugaya-s-classification-can-reflect-abduction-muscle-strength-of-the-shoulder
#9
Masahito Yoshida, Phillipe Collin, Thierry Josseaume, Alexandre Lädermann, Hideyuki Goto, Katumasa Sugimoto, Takanobu Otsuka
PURPOSE: Magnetic resonance (MR) imaging is common in structural and qualitative assessment of the rotator cuff post-operatively. Rotator cuff integrity has been thought to be associated with clinical outcome. The purpose of this study was to evaluate the inter-observer reliability of cuff integrity (Sugaya's classification) and assess the correlation between Sugaya's classification and the clinical outcome. It was hypothesized that Sugaya's classification would show good reliability and good correlation with the clinical outcome...
June 22, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28643079/similar-clinical-outcomes-with-preoperative-and-postoperative-start-of-thromboprophylaxis-in-tha-a-register-based-study
#10
Pål O Borgen, Are H Pripp, Eva Dybvik, Lilian Leistad, Ola E Dahl, Olav Reikerås
BACKGROUND: Elective THA is associated with a high risk of thromboembolic events. Although these events may be less common now than they were in the past, they can be serious, and most patients undergoing the procedure therefore still receive thromboprophylaxis. However, controversy remains regarding whether to begin thromboprophylaxis before THA or after to best balance the risks of clotting and bleeding. QUESTIONS/PURPOSES: We asked the following questions: (1) Is there a difference in bleeding events with pre- versus postoperative thromboprophylaxis? (2) Is there a difference in thromboembolic episodes after THA between the two regimens? (3) How do the two approaches of thromboprophylaxis influence mortality, readmissions, and other complications? METHODS: We used a population-based followup design with predefined data based on international health codification to assess clinical effects of LMWH prophylaxis initiated before or after THA...
June 22, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28643025/effects-of-bariatric-surgery-on-pelvic-floor-disorders-in-obese-women-a-meta-analysis
#11
REVIEW
Wenqing Lian, Yiqun Zheng, Hongxing Huang, Lianghua Chen, Bin Cao
PURPOSE: Obesity is an established risk factor for pelvic floor disorders (PFD) but the effects of bariatric surgery on PFD are uncertain. This meta-analysis was conducted to evaluate the effects of bariatric surgery on PFD in obese women. METHODS: A systematic search of PubMed, Cochrane Library, CNKI and CBM databases up to October 2016 was performed, and studies reporting pre-operative and post-operative outcomes in obese women undergoing bariatric surgery were included...
June 22, 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/28642183/giant-bi-compartmental-cystic-tentorial-schwannoma-mimicking-a-meningioma
#12
Amandeep Kumar, Manmohan Singh, M C Sharma, P S Chandra, Bhawani S Sharma, Ashok K Mahapatra
BACKGROUND: Intracranial schwannomas most commonly arise from vestibulo-cochlear nerve and less frequently from trigeminal, facial and hypoglossal nerves. However, intracranial schwannomas unrelated to cranial nerves (ISUNs) are very rare and only ∼ 50 such cases have been reported in literature. Amongst these, tentorial schwannomas are even rarer and only 13 cases have been reported till date. We present one such rare case of giant tentorial schwannoma (TS). CASE DESCRIPTION: A 21 year old male patient presented to us with complaints of generalised headache and dizziness for past 6 months and worsening of symptoms for past 2 months...
June 19, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28642179/analysis-of-outcomes-of-multidisciplinary-management-of-gliosarcoma-a-single-centre-study-2000-2013
#13
Abhinav Jain, Jason Correia, Patrick Schweder, Adele McMahon, Joseph Merola, Robert Aspoas
BACKGROUND: Gliosarcoma is a rare CNS tumour with a reported incidence of ∼2-8% of all gliomas. We reviewed the outcomes of patients treated at our institution over a 14-year period from 2000-2013 to characterize overall and progression free survival as well as to elucidate the additive effect of chemo-radiotherapy. METHODS: For the duration of 01/01/2000 to 31/12/2013, we retrospectively reviewed the clinical notes of all patients treated at our institution with a histopathological diagnosis of Gliosarcoma...
June 19, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28642164/joint-loading-and-proximal-tibia-subchondral-trabecular-bone-microarchitecture-differ-with-walking-gait-patterns-in-end-stage-knee-osteoarthritis
#14
Bryant C Roberts, Lucian B Solomon, Graham Mercer, Karen J Reynolds, Dominic Thewlis, Egon Perilli
OBJECTIVES: To (1) stratify subgroups according to their distinct walking gait patterns in end-stage knee osteoarthritis (OA) patients; (2) compare measures of joint loading and proximal tibia subchondral trabecular bone (STB) microarchitecture among subgroups. DESIGN: Twenty-five knee OA patients undergoing total knee arthroplasty had pre-operative gait analysis. Following surgery, excised tibial plateaus were micro-CT-scanned and STB microarchitecture analysed in four tibial condylar regions of interest...
June 19, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28642141/added-diagnostic-value-and-impact-on-antimicrobial-therapy-of-16s-rrna-pcr-and-amplicon-sequencing-on-resected-heart-valves-in-infective-endocarditis-a-prospective-cohort-study
#15
Bart Peeters, Paul Herijgers, Kurt Beuselinck, Jan Verhaegen, Willy E Peetermans, Marie-Christine Herregods, Stefanie Desmet, Katrien Lagrou
OBJECTIVES: For adequate management and therapy of infective endocarditis (IE), identification of the causative pathogen is crucial but currently molecular testing results are not included in diagnostic criteria. The added diagnostic value and impact on antimicrobial therapy of 16S rRNA PCR and Amplicon Sequencing (16S rRNA PCR) performed on excised heart valves from IE patients was evaluated alongside with the effect of pre-operative antibiotics on the performance of blood culture (BC), valve culture (VC) and 16S rRNA PCR...
June 19, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28642083/colorectal-surgery-and-enhanced-recovery-impact-of-a-simulation-based-care-pathway-training-curriculum
#16
L Beyer-Berjot, P Pucher, V Patel, D A Hashimoto, P Ziprin, S Berdah, A Darzi, R Aggarwal
BACKGROUND: The aim was to determine whether a simulation-based care pathway approach (CPA) curriculum could improve compliance for enhanced recovery programs (ERP), and residents' participation in laparoscopic colorectal surgery (LCS). Indeed, trainee surgeons have limited access to LCS as primary operator, and ERP have improved patients' outcomes in colorectal surgery (CS). METHODS: All residents of our department were trained in a simulation-based CPA: perioperative training consisted in virtual patients built according to guidelines in both ERP and CS, whilst intraoperative training involved a virtual reality simulator curriculum...
June 19, 2017: Journal of Visceral Surgery
https://www.readbyqxmd.com/read/28640035/the-professionalism-and-integrity-in-research-program-description-and-preliminary-outcomes
#17
James M DuBois, John T Chibnall, Raymond Tait, Jillon S Vander Wal
Violations of rules and regulations in research can cause significant problems for human participants, animal subjects, data integrity, institutions, and investigators. The Professionalism and Integrity in Research Program (PI Program) provides remediation training that addresses the root causes of violations of rules and regulations in research. Through assessments, a three-day workshop, and follow-up coaching calls, the PI Program teaches evidence-based decision-making strategies designed to help researchers to compensate for bias, uncertainty, and work-related stress, and foster the skills needed to oversee research projects in today's complex regulatory environments...
June 20, 2017: Academic Medicine: Journal of the Association of American Medical Colleges
https://www.readbyqxmd.com/read/28639884/loss-of-tumor-suppressor-mir-126-contributes-to-the-development-of-hepatitis-b-virus-related-hepatocellular-carcinoma-metastasis-through-the-upregulation-of-adam9
#18
Le-Yang Xiang, Huo-Hui Ou, Xin-Cheng Liu, Zhan-Jun Chen, Xiang-Hong Li, Yu Huang, Ding-Hua Yang
Hepatocellular carcinoma is the most common histological type of primary liver cancer, which represents the second leading cause of cancer-related mortality. MiR-126 was reported to be downregulated in hepatocellular carcinoma tissues, compared with its levels in noncancerous tissues. However, baseline miR-126 expression levels in hepatitis B virus-related hepatocellular carcinoma patients who did not undergo pre-operational treatment remains unknown since hepatitis B virus infection and pre-operational transcatheter arterial chemoembolization were shown to upregulate miR-126 expression...
June 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28639516/accuracy-assessment-of-surgical-planning-and-three-dimensional-printed-patient-specific-guides-for-orthopaedic-osteotomies
#19
Gwen Sys, Hannelore Eykens, Gerlinde Lenaerts, Felix Shumelinsky, Cedric Robbrecht, Bart Poffyn
This study analyses the accuracy of three-dimensional pre-operative planning and patient-specific guides for orthopaedic osteotomies. To this end, patient-specific guides were compared to the classical freehand method in an experimental setup with saw bones in two phases. In the first phase, the effect of guide design and oscillating versus reciprocating saws was analysed. The difference between target and performed cuts was quantified by the average distance deviation and average angular deviations in the sagittal and coronal planes for the different osteotomies...
June 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28639040/mobile-gastrointestinal-and-endoscopic-surgery-in-rural-ecuador-20%C3%A2-years-experience-of-cinterandes
#20
H T Shalabi, M D Price, S T Shalabi, E B Rodas, A L Vicuña, B Guzhñay, R R Price, E Rodas
INTRODUCTION: Five billion people worldwide do not have timely access to surgical care. Cinterandes is one of the only mobile surgical units in low- and middle-income countries. This paper examines the methodology that Cinterandes uses to deliver mobile surgery. METHODS: Founding and core staff were interviewed, four missions were participated in, and internal documents and records were analysed between 1 May and 1 July 2014. RESULTS: Cinterandes performed 7641 operations over the last 20 years (60% gastrointestinal/laparoscopic), travelling 300,000 km to remote areas of Ecuador...
June 21, 2017: Surgical Endoscopy
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