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Occupational injuries and burn out among orthopedic oncology surgeons

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World Journal of Orthopedics 2022年第12期13卷 1056-1063页

作者： Abdulrahman M Alaseem robert e turcotte Nathalie Ste-Marie Mohammad M Alzahrani Saad M Alqahtani Krista A Goulding Department of Orthopedic Surgery College of MedicineKing Saud UniversityRiyadh 12372Saudi Arabia Department of Orthopedic Surgery McGill University Health CentreMontreal H4A3J1Canada Department of Orthopedic Surgery College of MedicineImam Abdulrahman Bin Faisal universityDammam 34212Saudi Arabia Department of Orthopaedic Surgery Mayo ClinicPhoenixArizona 85054USA

BACKGROUND Orthopedic oncology surgeons commonly engage in prolonged and complex surgical *** types of surgeries increase the risk of physical and psychological stressors,which may in turn make these physicians prone to workrelated occupational *** The aim of this study was to explore in orthopedic oncologists,the prevalence of work-related physical injuries and psychological *** A modified version of the physical discomfort survey was developed to assess occupational injuries among orthopedic oncology surgeon members of the Musculoskeletal Tumor Society,the Canadian Orthopedic Oncology Society and european Musculoskeletal Oncology *** survey was sent by email,and it explored musculoskeletal complaints,psychological disturbances,treatment required for these complaints and the requirement of time off *** A total of 67 surgeon responses were collected.A high number of orthopedic oncologists(84%)reported an occupational *** back pain(39%)was the most prevalent musculoskeletal condition,followed by lumbar disk herniation(16%),shoulder tendinitis(15%)and lateral epicondylitis(13%).Of the cohort,46%required surgery and 31%required time off work due to their ***-three respondents reported a psychological ***(27%),anxiety(20%)and insomnia(20%)were the most commonly *** required off work due to injury was associated with old age and years in *** Orthopedic oncology surgeons report a high prevalence of work-related *** back related injury and burnout were the most reported *** operative room ergonomics and prevention of stress related to the work environment should be areas to explore in upcoming research.

关键词： Orthopedic oncology Surgeons Occupational Musculoskeletal Injuries

Recurrent cyclops lesion after primary anterior cruciate ligament reconstruction using bone tendon bone allograft:A case report

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World Journal of Orthopedics 2023年第11期14卷 836-842页

作者： Grayson Kelmer Andrea H Johnson Justin J turcotte Daniel e Redziniak Orthopedic Research Anne Arundel Medical CenterAnnapolisMD 21401United States Medical School Campbell University School of Osteopathic MedicineLillingtonNC 27546United States Orthopedic Surgery Anne Arundel Medical CenterAnnapolisMD 21401United States

BACKGROUND Cyclops lesions are a known complication of anterior cruciate ligament(ACL)reconstruction,with symptomatic cyclops syndrome occurring in up to 11%of *** cyclops lesions have been rarely documented;this case study documents the successful treatment of a recurrent cyclops *** SUMMARY A 28-year-old female presented following a non-contact injury to the right *** and clinical exam revealed an ACL tear,and arthroscopic reconstruction was *** years later a cyclops lesion was discovered and removed via arthroscopic *** months postoperatively,the patient presented with pain,stiffness,and difficulty achieving terminal extension.A smaller recurrent cyclops lesion was diagnosed,and a repeat synovectomy was *** patient recovered *** To the best of our knowledge,this is the first documented case of recurrent cyclops lesion after bone-patellar tendon-bone allograft ACL reconstruction presenting as cyclops syndrome.

关键词： Anterior cruciate ligament Cyclops lesion Cyclops syndrome Knee arthroscopy Anterior cruciate ligament reconstruction Case report

Impact Assessment and Mitigation Techniques for High Penetration Levels of Renewable energy Sources in Distribution Networks:Voltage-control Perspective

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Journal of Modern Power Systems and Clean energy 2022年第2期10卷 450-458页

作者： Ahmed S.A.Awad Dave turcotte Tarek H.M.el-Fouly Natural Resources Canada Can-metENERGYVarennesCanadaon leave from the Electrical Power and Machines DepartmentFaculty of EngineeringAin Shams UniversityCairo 11566Egyp Natural Resources Canada CanmetENERGYVarennesCanada Advanced Power and energy Center Khalifa UniversityAbu DhabiUnited Arab Emirates

The integration of renewable distributed generation(RDG)into distribution networks is promising and increasing ***,high penetration levels of distributed generation(DG)are often limited as they may have an adverse effect on the operation of distribution *** of the operation challenges is the interaction between DG and voltage-control equipment,e.g.,an under-load tap changer(ULTC),which is basically designed to compensate for voltage changes caused by slow load *** integration of variable DGs leads to rapid voltage fluctuations,which can negatively affect the tap operation of *** paper investigates the impact of high penetration levels of RDG on the tap operation of ULTC in distribution networks through *** mitigation techniques that can alleviate this impact are also *** these techniques,constant power-factor mode is regarded as the best trade-off between the simplicity and effectiveness of minimizing the number of tap *** are performed on a Canadian benchmark rural distribution feeder using OpenDSS software.

关键词： Renewable energy distributed generation(DG) voltage regulator load tap changer distribution network.

Hydrologic Time Scale:A Fundamental Stream Characteristic

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Journal of earth Science 2022年第5期33卷 1291-1297页

作者： robert e.Criss Department of earth and Planetary Sciences Washington University in St.LouisSt.LouisMO63130USA

A new,fundamental catchment attribute called the hydrologic time scaleτgoverns the rate of delivery of runoff to a particular site,and is equal to∫Qdt/∫|dQ|,where Q is discharge and t is *** value ofτfor any gauged site is readily calculated from tabulated discharge data by replacing the integrals with *** quantity,coupled with the square root of catchment area,√A,form a coordinate pair that embodies the characteristic time and length scales for any catchment,which govern its flow *** fitting constants used in several unit hydrograph models are simple multiples ofτ,so knowledge ofτallows rapid calibration of these models for the particular site,facilitating flow prediction from rainfall *** ofτreflect many different landscape attributes,but for multiple sub-basins in watersheds with homogeneous land use and lithologic conditions,they correlate linearly with √*** ratio √A/τprovides a characteristic velocity that is high for channelized,floodprone rivers,for flashy urban streams with high impervious cover,and for sites downstream of hydropower *** with low velocities are resistant to flooding,as their landscapes have a greater ability to delay the delivery of runoff by retention,detention,and infiltration into the groundwater system.

关键词： unit hydrograph time constant flash floods impervious cover urban streams flashiness hydrogeology

Statistics of evolving Populations and Their Relevance to Flood Risk

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Journal of earth Science 2016年第1期27卷 2-8页

作者： robert e.Criss Department of earth and Planetary Sciences Washington University in St.Louis

Statistical methods are commonly used to evaluate natural populations and environmental variables, yet these must recognize temporal trends in population character to be appropriate in an evolving world. New equations presented here define the statistical measures of aggregate historical populations affected by linear changes in population means and standard deviations. These can be used to extract the statistical character of present-day populations, needed to define modern variability and risk, from tables of historical data that are dominated by measurements made when conditions were different. As an example, many factors such as climate change and in-channel structures are causing flood levels to rise, so realistic estimation of future flood levels must take such secular changes into account. The new equations provide estimates of water levels for ＂100-year＂ floods in the USA Midwest that are 0.5 to 2 m higher than official calculations that routinely assume population stationarity. These equations also show that flood levels will continue to rise by several centimeters per year. This rate is nearly ten times faster than the rise of sea level, and thus represents one of the fastest and most damaging rates of change that is documented by robust data.

关键词： flood risk statistical theory Mississippi River.

Use of Geochemical and Geophysical Techniques to Characterize and Prospect for Geothermal Resources and Hydrothermal Ore Deposits

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Journal of earth Science 2015年第1期26卷 73-77页

作者： robert e.Criss Department of earth and Planetary Sciences Washington UniversitySt.Louis 63130USA

Fluid-rock interactions alter the geochemical, isotopic, petrographic and physical character of host rocks, producing a permanent record of hydrothermal activity. Maps of altered rock properties show regular variations that disclose master geologic controls and delineate likely sites for geothermal and mineral resources. In many cases, geochemical and stable isotope data re- veal the origins of thermal fluids, and they can also provide estimates of reservoir temperatures and identify zones of fluid recharge.

关键词： geothermal system hydrothermal system geophysical prospecting geochemicalprospecting Mt. Lassen oxygen isotope.

Dependence of Mean and Peak Streamflow on Basin Area in the Conterminous United States

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Journal of earth Science 2016年第1期27卷 83-88页

作者： William e.Winston robert e.Criss Department of earth and Planetary Sciences Washington University in St.Louis

Basin area is the primary control on both mean and peak streamflows, but relationships vary with regional meteorological conditions. Rich historical data sets permit deduction of these relationships for most areas of the United States, revealing both expected and unexpected correlations. On log-log plots, mean flows for most basins with 〉75 cm/y rainfall have unit slopes, with the y-intercept approximating the mean annual runoff. Lower slopes characterize regions where runoff is greatest at high topographic elevations, or where significant withdrawals for irrigation occur at lower elevations. Peak flows also correlate strongly with basin area, but the regressions for most regions have slopes ranging from 0.4 to 0.9, and y-intercepts that increase with increasing flood recurrence interval. The slopes on these log-log plots for peak flows are highest in cool regions with low sunshine and low evapotranspiration, and lowest where sunshine is abundant, evapotranspiration is high, and small convective storm cells are common. effects of relief are small and inconsistent. Peak flows of small watersheds are huge compared to their mean flows, commonly being several thousand times greater, particularly in the USA midcontinent where the slopes for peak flows are low.

关键词： floods GIS runoff rivers.

Development of a classification system based on corneal biomechanical properties using artificial intelligence predicting keratoconus severity

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eye and Vision 2021年第3期8卷 203-213页

作者： robert Herber Lutz e.Pillunat Frederik Raiskup Department of Ophthalmology University Hospital Carl Gustav CarusUniversitätsklinikum Carl Gustav Carus an der Technischen Universität DresdenFetscherstraße 74TU 01307 DresdenGermany

Background:To investigate machine-learning(ML)algorithms to differentiate corneal biomechanical properties between different topographical stages of keratoconus(KC)by dynamic Scheimpflug tonometry(CST,Corvis ST,Oculus,Wetzlar,Germany).In the following,ML models were used to predict the severity in a training and validation ***:Three hundred and eighteen keratoconic and one hundred sixteen healthy eyes were included in this monocentric and cross-sectional pilot *** corneal response(DCR)and corneal thickness related(pachymetric)parameters from CST were chosen by appropriated selection techniques to develop a ML *** stage of KC was determined by the topographical keratoconus classification system(TKC,Pentacam,Oculus).Patients who were classified as TKC 1,TKC 2 and TKC 3 were assigned to subgroup mild,moderate,and advanced *** patients were classified as TKC 1-2,TKC 2-3 or TKC 3-4,they were assigned to subgroups according to the normative range of further corneal indices(index of surface variance,keratoconus index and minimum radius).Patients classified as TKC 4 were not included in this study due to the limited amount of *** discriminant analysis(LDA)and random forest(RF)algorithms were used to develop the classification *** were divided into training(70%of cases)and validation(30%of cases)***:LDA model predicted healthy,mild,moderate,and advanced KC eyes with a sensitivity(S_(n))/specificity(S_(p))of 82%/97%,73%/81%,62%/83%and 68%/95%from a validation dataset,*** the RF model,a S_(n)/S_(p) of 91%/94%,80%/90%,63%/87%,72%/95%could be reached for predicting healthy,mild,moderate,and advanced KC eyes,*** overall accuracy of LDA and RF was 71%and 78%,*** accuracy for KC detection including all subgroups of KC severity was 93%in both ***:The RF model showed good accuracy in predicting healthy eyes and various stages of *** accuracy was superior with respec

关键词： Artificial intelligence Corneal biomechanics Corvis ST Grading Keratoconus Machine learning

River Management and Flooding: The Lesson of December 2015–January 2016, Central USA

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Journal of earth Science 2016年第1期27卷 117-122页

作者： robert e.Criss Mingming Luo Department of earth and Planetary Sciences Washington University in St.Louis School of environmental Studies China University of Geosciences

The huge winter storm of December 23-29, 2015 delivered heavy rainfall in a broad swath across the USA, deluging east-Central Missouri. Record high river levels were set at many sites, but damages were most pronounced in developed floodplain areas, particularly where high levees were built or river channels greatly narrowed. An average of 20 cm of rain that mostly fell in three days impacted the entire 10 300 km2 Meramec Basin. Compared to the prior record flood of 1982, the highest relative stage（＋1.3 m） on Meramec River occurred at Valley Park proximal to（1） a new levee,（2） a landfill in the floodway,（3） large floodplain construction fills, and（4） tributary creek basins impacted by suburban sprawl. even though only a small fraction of the 1.8 million km2 Mississippi River watershed above St. Louis received extraordinary rainfall during this event, the huge channelized river near and below St. Louis rapidly rose to set the 3rd-highest to the highest stages ever, exhibiting the flashy response typical of a much smaller river.

关键词： floods Mississippi River levees floodplain development.