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https://www.readbyqxmd.com/read/28199861/the-vato-project-development-and-validation-of-a-dynamic-transfer-model-of-tritium-in-grassland-ecosystem
#1
S Le Dizès, C Aulagnier, D Maro, M Rozet, F Vermorel, D Hébert, C Voiseux, L Solier, C Godinot, B Fievet, P Laguionie, O Connan, O Cazimajou, M Morillon
In this paper, a dynamic compartment model with a high temporal resolution has been investigated to describe tritium transfer in grassland ecosystems exposed to atmospheric (3)H releases from nuclear facilities under normal operating or accidental conditions. TOCATTA-χ model belongs to the larger framework of the SYMBIOSE modelling and simulation platform that aims to assess the fate and transport of a wide range of radionuclides in various environmental systems. In this context, the conceptual and mathematical models of TOCATTA-χ have been designed to be relatively simple, minimizing the number of compartments and input parameters required...
February 12, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28182736/comparison-of-clinical-and-radiological-outcomes-between-opening-wedge-and-closing-wedge-high-tibial-osteotomy-a-comprehensive-meta-analysis
#2
Lingfeng Wu, Jun Lin, Zhicheng Jin, Xiaobin Cai, Weiyang Gao
High tibial osteotomy (HTO) has been widely used for clinical treatment of osteoarthritis of the medial compartment of the knee, and both opening-wedge and closing-wedge HTO are the most commonly used methods. However, it remains unclear which technique has better clinical and radiological outcomes in practice. To systematically evaluate this issue, we conducted a comprehensive meta-analysis by pooling all available data for the opening-wedge HTO and closing-wedge HTO techniques from the electronic databases including PubMed, Embase, Wed of Science and Cochrane Library...
2017: PloS One
https://www.readbyqxmd.com/read/28176602/comparison-of-hto-with-articular-cartilage-surgery-and-uka-in-unicompartmental-oa
#3
Yoon Sang Jeon, Chi Hoon Ahn, Myung-Ku Kim
PURPOSE: The purpose of this article was to assess the clinical outcome of high tibial osteotomy (HTO) with articular cartilage surgery compared with unicompartmental knee arthroplasty (UKA) in unicompartmental osteoarthritis (OA). METHODS: We designed retrospective study and evaluated 47 patients with unicompartmental OA (Kellgren-Laurence [K-L] grade ≥III OA). Two groups of patients underwent either HTO with articular cartilage surgery or UKA by the senior author between January 2010 and April 2013...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28173978/the-effects-of-tibia-profile-distraction-angle-and-knee-load-on-wedge-instability-and-hinge-fracture-a-finite-element-study
#4
Pei-Wei Weng, Chia-Hsien Chen, Chu-An Luo, Jui-Sheng Sun, Yang-Hwei Tsuang, Cheng-Kung Cheng, Shang-Chih Lin
Several plate systems for high tibial osteotomy (HTO) have been developed to stabilize the opening wedge of an osteotomized tibia. Among them, the TomoFix system, having a quasi-straight and T-shaped design, has been widely adopted in the literature. However, this system is implemented by inserting a lag (i.e., cortical) screw through the proximal combi-hole, to deform the plate and pull the distal tibia toward the plate. This process potentially induces plate springback and creates an elastic preload on the osteotomized tibia, especially at the lateral hinge of the distracted wedge...
February 4, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28169100/three-dimensional-relationships-between-secondary-changes-and-selective-osteotomy-parameters-for-biplane-medial-open-wedge-high-tibial-osteotomy
#5
Byung Hoon Lee, Chul Won Ha, Sang Won Moon, Minho Chang, Hun Yeong Kim, Sin Hyung Park, Joon Ho Wang
BACKGROUND: To assess the axial rotational change of distal tibia and posterior tibial slope (PTS) change after OWHTO in 3-D planes and to identify the causal relationship on the effect of variation in the posterior slope angle and rotational errors. METHODS: A total of 21 patients (23 knees) underwent OWHTO and were evaluated with 3D-CT before and after surgery. Medial proximal tibial angle in the coronal plane, PTS in the sagittal plane, and rotational axis in axial plane were evaluated and compared between pre- and post-operative 3D models constructed by applying reverse-engineering software...
February 4, 2017: Knee
https://www.readbyqxmd.com/read/28166705/high-tibial-osteotomy-combined-with-cancellous-bone-graft-and-osteochondral-autograft-transplantation-in-a-patient-with-massive-osteochondral-defects-in-the-medial-femoral-condyle
#6
Takehiko Matsushita, Shu Watanabe, Daisuke Araki, Tomoyuki Matsumoto, Koji Takayama, Masahiro Kurosaka, Ryosuke Kuroda
Treatment of massive osteochondral defects of the medial femoral condyle is challenging. A 46-year-old man who had a medial femoral condyle fracture on his left knee underwent osteosynthesis in a hospital, but the pain remained and the patient was referred to our hospital 8 months after the surgery. Radiographs showed a varus alignment of the leg, and magnetic resonance image showed a massive necrotic area in the medial femoral condyle. The patient received high tibial osteotomy (HTO) combined with iliac cancellous bone graft and an osteochondral autograft transplantation...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28160013/high-tibial-osteotomy-accelerates-lateral-compartment-osteoarthritis-in-discoid-meniscus-patients
#7
Jatin Prakash, Eun-Kyoo Song, Hong An Lim, Young Joo Shin, Cheng Jin, Jong-Keun Seon
PURPOSE: The valgus high tibial osteotomy (HTO) in patients with medial osteoarthritis and discoid lateral meniscus can result in increased load on the lateral compartment and hence a higher chances of tear. This may accelerate the progression of osteoarthritis on lateral compartment. We, therefore, carried out the case control study with a hypothesis that an HTO would accelerate the progression of osteoarthritis (OA) on lateral compartment in patients with complete discoid meniscus. METHODS: The records of all patients with open wedge HTO from 2008 to 2012 were evaluated for complete lateral discoid meniscus...
February 3, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28142346/preoperative-planning-using-the-picture-archiving-and-communication-system-technique-in-high-tibial-osteotomy
#8
Hee-June Kim, Hyun-Joo Lee, Ji-Yeon Shin, Kyeong-Hyeon Park, Seung-Gi Min, Hee-Soo Kyung
PURPOSE: This study aimed to evaluate the accuracy of the picture archiving and communication system (PACS) method in order to select the correction angle and gap in open-wedge high tibial osteotomy (HTO) and clinical results of the patients. MATERIAL AND METHODS: This retrospective study analyzed 27 consecutive patients (30 knees) underwent open-wedge HTO using the PACS method between April 2013 and March 2015. Full-length lower limb radiographs obtained preoperatively and at the final follow-up were used to the percentages of crossing points of the weight-bearing line and tibial plateau with respect to the medial border and mechanical femur-tibia angle...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28137553/can-three-dimensional-patient-specific-cutting-guides-be-used-to-achieve-optimal-correction-for-high-tibial-osteotomy-pilot-study
#9
M Munier, M Donnez, M Ollivier, X Flecher, P Chabrand, J-N Argenson, S Parratte
INTRODUCTION: Treatment of medial tibiofemoral osteoarthritis with a high-tibial osteotomy (HTO) is most effective when the optimal angular correction is achieved. However, conventional instrumentation is limited when multiplanar correction is needed. HYPOTHESIS: Use of patient-specific cutting guides (PSGCs) for HTO provides an accurate correction (difference < 2°) relative to the preoperative planning. MATERIALS AND METHODS: Between February 2014 and February 2015, 10 patients (mean age 46 years (range 31-59), grade 1 or 2 osteoarthritis in Ahlbäck's classification) were included prospectively in this reliability and safety study...
January 27, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28100411/comparison-of-mid-term-results-between-conversion-total-knee-arthroplasties-following-closed-wedge-high-tibial-osteotomy-and-primary-total-knee-arthroplasties-a-matched-pair-study-including-patellar-symptom-and-position
#10
Dae Kyung Bae, Sang Jun Song, Cheol Hee Park, Hu Liang, Jung Kwon Bae
BACKGROUND: The purpose of this study was to compare mid-term clinical and radiographic results of conversion total knee arthroplasties (TKA) following a closed-wedge high tibial osteotomy (HTO) and primary TKAs. METHODS: A total of 32 conversion TKAs (29 patients) were compared with a matched control group of patients who had undergone primary TKA. The clinical results were evaluated using the Knee Society Knee and Function score, the Western Ontario and McMaster Universities score, patella score, and range of motion (ROM)...
January 16, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28088850/importance-of-interlayer-equivalent-pores-for-anion-diffusion-in-clay-rich-sedimentary-rocks
#11
Cornelia Wigger, Luc R Van Loon
The anion exclusion behavior in two different clay stones, Opalinus Clay (OPA) and Helvetic Marl (HM), was studied using a well-established experimental through-diffusion technique. The ionic strength of the pore water was varied between 0.01 and 5 M to evaluate its effect on the diffusion of HTO and (36)Cl(-). The total porosity determined by HTO-diffusion was independent of the ionic strength, while the anion accessible porosity varies with the ionic strength of the pore water. In the case of Opalinus Clay, the anion accessible porosity increases from 3% at low ionic strength (0...
February 2, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28063371/individual-dose-due-to-radioactivity-accidental-release-from-fusion-reactor
#12
Baojie Nie, Muyi Ni, Shiping Wei
As an important index shaping the design of fusion safety system, evaluation of public radiation consequences have risen as a hot topic on the way to develop fusion energy. In this work, the comprehensive public early dose was evaluated due to unit gram tritium (HT/HTO), activated dust, activated corrosion products (ACPs) and activated gases accidental release from ITER like fusion reactor. Meanwhile, considering that we cannot completely eliminate the occurrence likelihood of multi-failure of vacuum vessel and tokamak building, we conservatively evaluated the public radiation consequences and environment restoration after the worst hypothetical accident preliminarily...
December 11, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28053258/ankle-joint-pressure-changes-in-high-tibial-and-distal-femoral-osteotomies-a-cadaver-study
#13
F Krause, A Barandun, G Klammer, I Zderic, B Gueorguiev, T Schmid
AIMS: To assess the effect of high tibial and distal femoral osteotomies (HTO and DFO) on the pressure characteristics of the ankle joint. MATERIALS AND METHODS: Varus and valgus malalignment of the knee was simulated in human cadaver full-length legs. Testing included four measurements: baseline malalignment, 5° and 10° re-aligning osteotomy, and control baseline malalignment. For HTO, testing was rerun with the subtalar joint fixed. In order to represent half body weight, a 300 N force was applied onto the femoral head...
January 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28043753/medial-open-wedge-high-tibial-osteotomy-may-adversely-affect-the-patellofemoral-joint
#14
Kang-Il Kim, Dong-Kyoon Kim, Sang-Jun Song, Sang-Hak Lee, Dae-Kyung Bae
PURPOSE: To evaluate 2-stage arthroscopic findings of the patellofemoral joint before and after medial open-wedge high tibial osteotomy (HTO) and verify whether the patellofemoral joint would be influenced by medial open-wedge HTO. METHODS: We prospectively reviewed 114 cases of medial open-wedge HTO for the treatment of osteoarthritis with a varus knee. First-look arthroscopy was performed during HTO. The mean age at the time of HTO was 56.34 ± 5.4 years (range, 40-69 years)...
December 30, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28043299/-mechanism-of-protective-effects-of-tumor-necrosis-factor-receptor-associated-protein-1-on-hypoxic-cardiomyocytes-of-rats
#15
F Xiang, D X Zhang, S Y Ma, Y S Huang
Objective: To investigate the mechanism of protective effects of tumor necrosis factor receptor associated protein 1 (TRAP1) on hypoxic cardiomyocytes of rats. Methods: Primary cultured cardiomyocytes were obtained from neonatal Sprague-Dawley rats (aged 1 to 3 days) and then used in the following experiments. (1) Cells were divided into group TRAP1 and control group according to the random number table (the same grouping method below), and then the total protein of cells was extracted. Total protein of cells in group TRAP1 was added with mouse anti-rat TRAP1 monoclonal antibody, while that in control group was added with the same type of IgG from mouse...
December 20, 2016: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/28024541/natural-cellulose-fiber-derived-hollow-tubular-oriented-polydopamine-in-situ-formation-of-ag-nanoparticles-for-reduction-of-4-nitrophenol
#16
Enjuan Cao, Wenzhen Duan, Feng Wang, Aiqin Wang, Yian Zheng
A facile method was reported to achieve hollow-tubular-oriented polydopamine (HTO-PDA) layer using natural kapok fiber (KF) as the bio-template without any pretreatments by altering hydrophobic fiber into hydrophilic one. Subsequently, the HTO-PDA can be utilized for direct in-situ deposition of Ag nanoparticles (NPs). The structures of pristine fiber and HTO-PDA, as well as the resulting Ag NPs attached HTO-PDA (Ag@HTO-PDA) were well characterized by means of scanning electron microscopy (SEM) coupled energy dispersion spectrum (EDS), x-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectroscopy...
February 20, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27999503/factors-affecting-the-union-of-opening-wedge-high-tibial-osteotomy-using-a-titanium-wedge-plate
#17
Husam T Nawas, Dharmpal V Vansadia, James R Heltsley, Misty Suri, Scott Montgomery, Deryk G Jones
BACKGROUND: Factors that can affect the success rate of high tibial osteotomy (HTO) include patient selection, surgical technique, type of fixation hardware, supplemental fixation, choice of bone graft, and rehabilitation protocol. The purpose of this study was to define the role of cortical hinge fractures in the risk of nonunion and collapse of opening wedge high tibial osteotomy. METHODS: A total of 60 patients (mean age, 40 years) who underwent 64 primary HTO procedures were identified from our operational database and observed at a mean follow-up of 2 years...
2016: Ochsner Journal
https://www.readbyqxmd.com/read/27981853/comparing-the-accuracy-of-high-tibial-osteotomies-between-computer-navigation-and-conventional-methods
#18
Justin Chang, Greg Scallon, Mitch Beckert, Jeff Zavala, Matthew Bollier, Brian Wolf, John Albright
BACKGROUND: The accuracy of correction has been shown to be an important determinant in long-term outcomes of patients who were treated with a medial open-wedge high tibial osteotomy (HTO) who suffer from unicompartmental osteoarthritis (OA). Computer navigation systems have the potential to improve surgical precision. The purpose of this study was to compare radiographic outcomes between patients treated with a navigation system and those treated through conventional methods of assessing alignment intra-operatively...
December 2017: Comput Assist Surg (Abingdon)
https://www.readbyqxmd.com/read/27922333/environmentally-relevant-chronic-low-dose-tritium-and-gamma-exposures-do-not-increase-somatic-intrachromosomal-recombination-in-pkz1-mouse-spleen
#19
Laura Bannister, Mandy Serran, Lindsey Bertrand, Dmitry Klokov, Heather Wyatt, Melinda Blimkie, Yann Gueguen, Nicholas Priest, Jean-René Jourdain, Pamela Sykes
The toxicity of tritium is a public health concern given its presence and mobility in the environment. For risk predictions using radiological protection models, it is essential to allocate an appropriate radiation weighting factor (WR). This in turn should be consistent with the observed relative biological effectiveness (RBE) of tritium beta radiation. Although the International Commission on Radiological Protection (ICRP) currently recommends a WR of 1 for the calculation of committed effective dose for X rays, gamma rays and electrons of all energies, including tritium energies, there are concerns that tritium health risks are underestimated and that current regulatory tritium drinking water standards need revision...
December 2016: Radiation Research
https://www.readbyqxmd.com/read/27916298/uncertainty-of-current-understanding-regarding-obt-formation-in-plants
#20
A Melintescu, D Galeriu
Radiological impact models are important tools that support nuclear safety. For tritium, a special radionuclide that readily enters the life cycle, the processes involved in its transport into the environment are complex and inadequately understood. For example, tritiated water (HTO) enters plants by leaf and root uptake and is converted to organically bound tritium (OBT) in exchangeable and non-exchangeable forms; however, the observed OBT/HTO ratios in crops exhibit large variability and contradict the current models for routine releases...
February 2017: Journal of Environmental Radioactivity
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