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https://www.readbyqxmd.com/read/29331975/is-postoperative-bracing-after-pedicle-screw-fixation-of-spine-fractures-necessary-study-protocol-of-the-ornot-study-a-randomised-controlled-multicentre-trial
#1
Arjen Johannes Smits, Jaap Deunk, Agnita Stadhouder, Mark Cornelis Altena, Diederik Hendrik Ruth Kempen, Frank Willem Bloemers
INTRODUCTION: The most common surgical treatment of traumatic spine fractures is through a posterior approach using pedicle screws and rods. Postoperative treatment protocols including the use of postoperative orthoses however differ between hospitals and surgeons. A three-point hyperextension orthosis is designed to support proper posture and unload the anterior column. Some motion remains when wearing an orthosis, and its main value in postoperative treatment is therefore believed to be pain relief and patient confidence...
January 13, 2018: BMJ Open
https://www.readbyqxmd.com/read/29331910/review-of-synthetic-human-faeces-and-faecal-sludge-for-sanitation-and-wastewater-research
#2
REVIEW
Roni Penn, Barbara J Ward, Linda Strande, Max Maurer
Investigations involving human faeces and faecal sludge are of great importance for urban sanitation, such as operation and maintenance of sewer systems, or implementation of faecal sludge management. However, working with real faecal matter is difficult as it not only involves working with a pathogenic, malodorous material but also individual faeces and faecal sludge samples are highly variable, making it difficult to execute repeatable experiments. Synthetic faeces and faecal sludge can provide consistently reproducible substrate and alleviate these challenges...
December 30, 2017: Water Research
https://www.readbyqxmd.com/read/29331720/temporal-spatial-gait-parameter-models-of-very-slow-walking
#3
Andrew J J Smith, Edward D Lemaire
This study assessed the relationship between walking speed and common temporal-spatial stride-parameters to determine if a change in gait strategy occurs at extremely slow walking speeds. Stride-parameter models that represent slow walking can act as a reference for lower extremity exoskeleton and powered orthosis controls since these devices typically operate at walking speeds less than 0.4 m/s. Full-body motion capture data were collected from 30 health adults while walking on a self-paced treadmill, within a CAREN-Extended virtual reality environment...
January 6, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29331450/mapping-stimulus-feature-selectivity-in-macaque-v1-by-two-photon-ca2-imaging-encoding-model-analysis-of-fluorescence-responses-to-natural-movies
#4
REVIEW
Koji Ikezoe, Mahya Amano, Shinji Nishimoto, Ichiro Fujita
In vivo calcium (Ca2+) imaging using two-photon microscopy allows activity to be monitored simultaneously from hundreds of individual neurons within a local population. While this allows us to gain important insights into how cortical neurons represent sensory information, factors such as photo-bleaching of the Ca2+ indicator limit imaging duration (and thus the numbers of stimuli that can be tested), which in turn hampers the full characterization of neuronal response properties. Here, we demonstrate that using an encoding model combined with presentation of natural movies results in detailed characterization of receptive field (RF) properties despite the relatively short time for data collection...
January 10, 2018: NeuroImage
https://www.readbyqxmd.com/read/29330713/low-field-magnetic-resonance-imaging-offers-potential-for-measuring-tibial-component-migration
#5
F F Schröder, N J J Verdonschot, B Ten Haken, A Peters, A J H Vochteloo, D F M Pakvis, R Huis In't Veld
BACKGROUND: Roentgen stereophotogrammetric analysis (RSA) is used to measure early prosthetic migration and to predict future implant failure. RSA has several disadvantages, such as the need for perioperatively inserted tantalum markers. Therefore, this study evaluates low-field MRI as an alternative to RSA. The use of traditional MRI with prostheses induces disturbing metal artifacts which are reduced by low-field MRI. The purpose of this study is to assess the feasibility to use low-field (0...
January 12, 2018: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/29330588/whole-body-3d-kinematics-of-bird-take-off-key-role-of-the-legs-to-propel-the-trunk
#6
Pauline Provini, Anick Abourachid
Previous studies showed that birds primarily use their hindlimbs to propel themselves into the air in order to take-off. Yet, it remains unclear how the different parts of their musculoskeletal system move to produce the necessary acceleration. To quantify the relative motions of the bones during the terrestrial phase of take-off, we used biplanar fluoroscopy in two species of birds, diamond dove (Geopelia cuneata) and zebra finch (Taeniopygia guttata). We obtained a detailed 3D kinematics analysis of the head, the trunk and the three long bones of the left leg...
January 6, 2018: Die Naturwissenschaften
https://www.readbyqxmd.com/read/29330487/a-biomarker-characterizing-neurodevelopment-with-applications-in-autism
#7
Di Wu, Jorge V José, John I Nurnberger, Elizabeth B Torres
Despite great advances in neuroscience and genetic studies, our understanding of neurodevelopmental disorders is still quite limited. An important reason is not having objective psychiatric clinical tests. Here we propose a quantitative neurodevelopment assessment by studying natural movement outputs. Movement is central to behaviors: It involves complex coordination, temporal alterations, and precise dynamic controls. We carefully analyzed the continuous movement output data, collected with high definition electromagnetic sensors at millisecond time scales...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29329997/clinical-log-data-analysis-for-assessing-the-accuracy-of-the-cyberknife-fiducial-free-lung-tumor-tracking-system
#8
Masao Nakayama, Hideki Nishimura, Hiroshi Mayahara, Masaki Nakamura, Kazuyuki Uehara, Shinji Tsudou, Aya Harada, Hiroaki Akasaka, Ryohei Sasaki
PURPOSE: The CyberKnife Xsight Lung Tracking (XLT) and 1-View tracking systems can synchronize beam targeting to a visible lung tumor with respiratory motion during irradiation without requiring internal fiducial markers. The systems use a correlation model that relates external marker positions to tumor positions as well as a prediction model that predicts the target's future position. In this study, the correlation and prediction model uncertainties related to the CyberKnife fiducial-free tumor tracking system were evaluated using clinical log data...
November 4, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29329053/long-term-safety-area-tracking-lt-sat-with-online-failure-detection-and-recovery-for-robotic-minimally-invasive-surgery
#9
Veronica Penza, Xiaofei Du, Danail Stoyanov, Antonello Forgione, Leonardo S Mattos, Elena De Momi
Despite the benefits introduced by robotic systems in abdominal Minimally Invasive Surgery (MIS), major complications can still affect the outcome of the procedure, such as intra-operative bleeding. One of the causes is attributed to accidental damages to arteries or veins by the surgical tools, and some of the possible risk factors are related to the lack of sub-surface visibilty. Assistive tools guiding the surgical gestures to prevent these kind of injuries would represent a relevant step towards safer clinical procedures...
December 22, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/29328289/electrical-switching-of-birefringence-in-zirconium-phosphate-colloids-with-various-solvents
#10
Aurangzeb Rashid Masud, Seung-Ho Hong, Tian-Zi Shen, Chi-Hyo Ahn, Jang-Kun Song
Even though a graphene-oxide (GO) dispersion is attractive for electro-optical switching devices because of its high Kerr coefficient, it has several limitations such as chemical instability and optical loss due to absorption at visible wavelengths. Here we introduce the use of tetrabutylammonium-tethered α-zirconium phosphate (TBA-ZrP) colloid in various solvents for electro-optical switching devices; the TBA-ZrP colloid is chemically stable and optically transparent. We find that the electrical switching behavior of TBA-ZrP is sensitively dependent on the type of solvent...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328018/-a-day-in-the-life-of-a-medical-resident-on-the-ward
#11
A R Schuurman, S A Bos, K de Wit, R de Graaf, W J Wiersinga
OBJECTIVE: To investigate how internal medicine residents allocate their time during a hospital dayshift on the wards. DESIGN: Prospective observational cohort study (time and motion study). METHODS: Data were collected from 36 internal medicine residents working at the Internal Medicine Department of the Academic Medical Centre in Amsterdam, the Netherlands. Trained observers monitored 22 residents using a newly developed smartphone-application, registering their dayshift activities (meetings and education, direct patient contact, administrative tasks, lunch/break, other) and location (workstation, conference room, ward and patient rooms, other)...
2018: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/29327655/accuracy-between-optical-and-inertial-motion-capture-systems-for-assessing-trunk-speed-during-preferred-gait-and-transition-periods
#12
Martin Kokholm Fleron, Niels Christian Hauerbach Ubbesen, Francesco Battistella, David Leandro Dejtiar, Anderson Souza Oliveira
Motion capture through inertial sensors is becoming popular, but its accuracy to describe kinematics during changes in walking speed is unknown. The aim of this study was to determine the accuracy of trunk speed extracted using an inertial motion system compared to a gold standard optical motion system, during steady walking and stationary periods. Eleven participants walked on pre-established paths marked on the floor. Between each lap, a 1-second stationary transition period at the initial position was included prior to the next lap...
January 12, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29327579/can-multielectron-intercalation-reactions-be-the-basis-of-next-generation-batteries
#13
M Stanley Whittingham, Carrie Siu, Jia Ding
Intercalation compounds form the basis of essentially all lithium rechargeable batteries. They exhibit a wide range of electronic and crystallographic structures. The former varies from metallic conductors to excellent insulators. The latter often have layer structures or have open tunnel structures that can act as the hosts for the intercalation of a wide range of metal cation and other guest species. They are fascinating materials with almost infinitely variable properties, with the crystal structure controlling the identity and the amount of the guest species that may be intercalated and subsequently removed...
January 12, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29327379/influence-of-varying-stem-and-metaphyseal-sleeve-size-on-the-primary-stability-of-cementless-revision-tibial-trays-used-to-reconstruct-aori-iia-defects-a-simulation-study
#14
Maged Awadalla, Rami M A Al-Dirini, Dermot O'Rourke, Lucian Bogdan Solomon, Mark Heldreth, Mark Taylor
Traditionally, diaphyseal stems have been utilized to augment the stability of revision total knee replacement (rTKR) implants. More recently metaphyseal augments, such as sleeves, have been introduced to further augment component fixation. The effect of augments such as stems and sleeves have on the primary stability of a rTKR implant is poorly understood, however it has important implications on the complexity, costs and survivorship of the procedure. Finite element analysis was used to investigate the primary stability and strain distribution of various size stems and sleeves used in conjunction with a cementless revision tibial tray...
January 12, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29327169/passive-stiffness-of-monoarticular-lower-leg-muscles-is-influenced-by-knee-joint-angle
#15
Filiz Ateş, Ricardo J Andrade, Sandro R Freitas, François Hug, Lilian Lacourpaille, Raphael Gross, Can A Yucesoy, Antoine Nordez
PURPOSE: While several studies demonstrated the occurrence of intermuscular mechanical interactions, the physiological significance of these interactions remains a matter of debate. The purpose of this study was to quantify the localized changes in the shear modulus of the gastrocnemius lateralis (GL), monoarticular dorsi- and plantar-flexor muscles induced by a change in knee angle. METHOD: Participants underwent slow passive ankle rotations at the following two knee positions: knee flexed at 90° and knee fully extended...
January 11, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29326772/posterior-elbow-dislocation-with-brachial-artery-thrombosis-treated-non-surgically-a-case-report
#16
S M Lim, G G Chua, F Asrul, M Yazid
The brachial artery is rarely injured in closed posterior dislocation of the elbow, unlike the high rate of vascular injury seen after dislocation of the knee. Despite the anatomical proximity of the brachial artery to the elbow joint, most cases of brachial artery injury after dislocation of the elbow are related to an associated fracture, an open injury or high-energy trauma. A high index of suspicion should be maintained as well as a thorough neurovascular examination with regards this potentially disastrous complication...
November 2017: Malaysian Orthopaedic Journal
https://www.readbyqxmd.com/read/29325901/dynamic-structure-of-lower-limb-joint-angles-during-walking-post-stroke
#17
Kelley Kempski, Louis N Awad, Thomas S Buchanan, Jill S Higginson, Brian A Knarr
BACKGROUND: Variability in joint kinematics is necessary for adaptability and response to everyday perturbations; however, intrinsic neuromotor changes secondary to stroke often cause abnormal movement patterns. How these abnormal movement patterns relate to joint kinematic variability and its influence on post-stroke walking impairments is not well understood. OBJECTIVE: The purpose of this study was to evaluate the movement variability at the individual joint level in the paretic and non-paretic limbs of individuals post-stroke...
December 15, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29324296/inertial-sensing-of-the-motion-speed-effect-on-the-sit-to-walk-activity
#18
Nikolaos Kondilopoulos, Elissavet N Rousanoglou, Konstantinos D Boudolos
The STW execution at motion speed faster than normal most possibly enhances the risk for balance loss due to the increase in body segment accelerations. The purpose of the study was to use inertial sensing to examine the effect of motion speed on the STW segmental kinematics and its temporal events. Eighteen young men (20.7 ± 2.0 years) performed STW trials at preferred (PS) and fast (FS) motion speed. Data were collected with Xsens inertial sensors positioned at the trunk, thigh, shank, and foot segments...
January 4, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29323925/the-responsiveness-of-patient-reported-outcome-tools-in-shoulder-surgery-is-dependent-on-the-underlying-pathological-condition
#19
R Zackary Unger, Jeremy M Burnham, Lee Gammon, Chaitu S Malempati, Cale A Jacobs, Eric C Makhni
BACKGROUND: Given the high number of available patient-reported outcome (PRO) tools for patients undergoing shoulder surgery, comparative information is necessary to determine the most relevant forms to incorporate into clinical practice. PURPOSE: To determine the utilization and responsiveness of common PRO tools in studies involving patients undergoing arthroscopic rotator cuff repair or operative management of glenohumeral instability. STUDY DESIGN: Systematic review...
January 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29323490/activity-related-microsecond-dynamics-revealed-by-temperature-jump-f%C3%A3-rster-resonance-energy-transfer-measurements-on-thermophilic-alcohol-dehydrogenase
#20
Morgan B Vaughn, Jianyu Zhang, Thomas G Spiro, R Brian Dyer, Judith P Klinman
Previous studies of a thermophilic alcohol dehydrogenase (ht-ADH) demonstrated a range of discontinuous transitions at 30 °C that include catalysis, kinetic isotope effects, protein hydrogen-deuterium exchange rates, and intrinsic fluorescence properties. Using the Förster resonance energy transfer response from a Trp-NADH donor-acceptor pair in T-jump studies of ht-ADH, we now report microsecond protein motions that can be directly related to active site chemistry. Two distinctive transients are observed: a slow, kinetic process lacking a temperature break, together with a faster transient that is only detectable above 30 °C...
January 11, 2018: Journal of the American Chemical Society
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