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https://www.readbyqxmd.com/read/29789904/revision-knee-arthroplasty-with-rotating-hinge-systems-in-patients-with-gross-ligament-instability
#1
Sebastian P Boelch, Joerg Arnholdt, Boris M Holzapfel, Axel Jakuscheit, Maximilian Rudert, Maik Hoberg
PURPOSE: The clinical and radiographic outcomes after revision total knee arthroplasty (TKA) for instability with two rotating hinge knee prostheses were compared. METHODS: Fifty-one patients revised for TKA instability were prospectively randomized to either the Link Endo-Model (N = 26) or the EnduRo (N = 25). Clinical and radiographic outcome scores were compared pre-operatively and at 12 months' follow-up. Failure mechanisms were recorded. RESULTS: Age, BMI, operation, and tourniquet-time did not differ significantly between groups...
May 22, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29789512/extreme-ultraviolet-to-visible-dispersed-single-photon-detection-for-highly-sensitive-sensing-of-fundamental-processes-in-diverse-samples
#2
Andreas Hans, Philipp Schmidt, Christian Ozga, Gregor Hartmann, Xaver Holzapfel, Arno Ehresmann, André Knie
The detection of a single photon is the most sensitive method for sensing of photon emission. A common technique for single photon detection uses microchannel plate arrays combined with photocathodes and position sensitive anodes. Here, we report on the combination of such detectors with grating diffraction spectrometers, constituting a low-noise wavelength resolving photon spectroscopy apparatus with versatile applicability. We recapitulate the operation principle of such detectors and present the details of the experimental set-up, which we use to investigate fundamental mechanisms in atomic and molecular systems after excitation with tuneable synchrotron radiation...
May 23, 2018: Materials
https://www.readbyqxmd.com/read/29781651/exposure-and-cbt-for-chronic-back-pain-an-rct-on-differential-efficacy-and-optimal-length-of-treatment
#3
Julia Anna Glombiewski, Sebastian Holzapfel, Jenny Riecke, Johan W S Vlaeyen, Jeroen de Jong, Gunnar Lemmer, Winfried Rief
OBJECTIVE: Our aim was to establish whether Exposure, a specialized tailored treatment for chronic low back pain, has any advantages over cognitive-behavioral therapy (CBT) among individuals with high fear-avoidance levels. Second, we planned to compare short and long versions of Exposure. Third, we aimed to investigate whether Exposure can be delivered in an outpatient psychological setting. METHOD: A total of 88 Caucasian participants (55% women) were randomized to three different psychological treatment conditions, Exposure-long, Exposure-short, and CBT...
June 2018: Journal of Consulting and Clinical Psychology
https://www.readbyqxmd.com/read/29777504/implementation-and-validation-of-constitutive-relations-for-human-dermis-mechanical-response
#4
Alessandra Aldieri, Mara Terzini, Cristina Bignardi, Elisabetta M Zanetti, Alberto L Audenino
Finite element models in conjunction with adequate constitutive relations are pivotal in several physiological and medical applications related to both native and engineered tissues, allowing to predict the tissue response under various loading states. In order to get reliable results, however, the validation of the constitutive models is crucial. Therefore, the main purpose of this work is to provide an experimental-computational approach to the biomechanical investigation of soft tissues such as the dermis...
May 19, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29767316/-ceus-diagnosis-of-solid-renal-tumors
#5
REVIEW
K Stock, H Kübler, T Maurer, J Slotta-Huspenina, K Holzapfel
CLINICAL ISSUE: Renal lesions are detected earlier, often as a result of ultrasound examinations. However, the imaging-based differential diagnosis of different tumour entities remains challenging STANDARD RADIOLOGICAL METHODS: All renal tumours >1 cm should be evaluated for malignancy by computed tomography (CT) or magnetic resonance imaging (MRI). If an angiomyolipoma diagnosis cannot be established with imaging, further diagnostics are appropriate or if malignant progression is suspected, then multidisciplinary discussion for TNM-staging based uro-oncologic therapy is usual...
May 16, 2018: Der Radiologe
https://www.readbyqxmd.com/read/29765449/effects-of-single-and-combined-low-frequency-electromagnetic-fields-and-simulated-microgravity-on-gene-expression-of-human-mesenchymal-stem-cells-during-chondrogenesis
#6
Susanne Mayer-Wagner, Florian Hammerschmid, Helmut Blum, Stefan Krebs, Julia I Redeker, Boris M Holzapfel, Volkmar Jansson, Peter E Müller
Introduction: Low frequency electromagnetic fields (LF-EMF) and simulated microgravity (SMG) have been observed to affect chondrogenesis. A controlled bioreactor system was developed to apply LF-EMF and SMG singly or combined during chondrogenic differentiation of human mesenchymal stem cells (hMSCs) in 3D culture. Material and methods: An external motor gear SMG bioreactor was combined with magnetic Helmholtz coils for EMF (5 mT; 15 Hz). Pellets of hMSCs (±TGF-β3) were cultured (P5) under SMG, LF-EMF, LF-EMF/SMG and control (1 g) conditions for 3 weeks...
April 2018: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/29753802/prevalence-and-predictors-of-sexual-problems-among-midlife-canadian-adults-results-from-a-national-survey
#7
Christopher Quinn-Nilas, Robin R Milhausen, Alexander McKay, Stephen Holzapfel
BACKGROUND: Sexual problems are common among midlife men and women, and studies have identified a range of demographic, health, and relational correlates. Research on prevalence of these sexual problems within Canada is sparse and is warranted given the unique context related to provision of health care services in contrast to other countries. AIM: We investigated sexual problems (women's low desire, orgasm difficulties, and vaginal pain, as well as men's low desire, erection difficulties, and ejaculation difficulties) and their correlates among a large sample of Canadian men and women aged 40-59 years...
May 9, 2018: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/29753644/extradural-anterior-clinoidectomy-in-the-management-of-parasellar-meningiomas-analysis-of-13-years-of-experience-and-literature-review
#8
Laura Salgado López, Fernando Muñoz Hernández, Carlos Asencio Cortés, Pere Tresserras Ribó, María Jesús Álvarez Holzapfel, Joan Molet Teixidó
BACKGROUND AND AIM: The extradural anterior clinoidectomy (EAC) is a key microsurgical technique that facilitates the resection of tumors located in the parasellar region. There is currently no consensus regarding the execution of the procedure via extradural or intradural nor scientific evidence that supports its routine use. The purpose of this article is to expose our experience in performing EAC as part of the management of the parasellar meningiomas. MATERIALS AND METHODS: A retrospective analysis of the EAC for parasellar meningioma resection performed in our center between 2003 and 2015 was done...
May 9, 2018: Neurocirugía
https://www.readbyqxmd.com/read/29705656/humanization-of-bone-and-bone-marrow-in-an-orthotopic-site-reveals-new-potential-therapeutic-targets-in-osteosarcoma
#9
Ferdinand Wagner, Boris M Holzapfel, Jacqui A McGovern, Abbas Shafiee, Jeremy G Baldwin, Laure C Martine, Christoph A Lahr, Felix M Wunner, Thor Friis, Onur Bas, Melanie Boxberg, Peter M Prodinger, Ali Shokoohmand, Davide Moi, Roberta Mazzieri, Daniela Loessner, Dietmar W Hutmacher
BACKGROUND: Existing preclinical murine models often fail to predict effects of anti-cancer drugs. In order to minimize interspecies-differences between murine hosts and human bone tumors of in vivo xenograft platforms, we tissue-engineered a novel orthotopic humanized bone model. METHODS: Orthotopic humanized tissue engineered bone constructs (ohTEBC) were fabricated by 3D printing of medical-grade polycaprolactone scaffolds, which were seeded with human osteoblasts and embedded within polyethylene glycol-based hydrogels containing human umbilical vein endothelial cells (HUVECs)...
July 2018: Biomaterials
https://www.readbyqxmd.com/read/29692770/modulation-of-active-gut-microbiota-by-lactobacillus-rhamnosus-gg-in-a-diet-induced-obesity-murine-model
#10
Yosep Ji, Soyoung Park, Haryung Park, Eunchong Hwang, Hyeunkil Shin, Bruno Pot, Wilhelm H Holzapfel
Gut microbiota play a key role in the development of metabolic disorders. Defining and correlating structural shifts in gut microbial assemblages with conditions related to metabolic syndrome have, however, been proven difficult. Results from 16S genomic DNA and 16S ribosomal RNA analyses of fecal samples may differ widely, leading to controversial information on the whole microbial community and metabolically active microbiota. Using a C57BL/6J murine model, we compared data from 16S genomic DNA and ribosomal RNA of the fecal microbiota...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29680878/quantitative-computed-tomography-in-comparison-with-transpulmonary-thermodilution-for-the-estimation-of-pulmonary-fluid-status-a-clinical-study-in-critically-ill-patients
#11
Bernd Saugel, Moritz Wildgruber, Albrecht Staudt, Michael Dieckmeyer, Konstantin Holzapfel, Georgios Kaissis, Mikhail Y Kirov, Vsevolod V Kuzkov, Roland M Schmid, Wolfgang Huber
Extravascular lung water (index) (EVLW(I)) can be estimated using transpulmonary thermodilution (TPTD). Computed tomography (CT) with quantitative analysis of lung tissue density has been proposed to quantify pulmonary edema. We compared variables of pulmonary fluid status assessed using quantitative CT and TPTD in critically ill patients. In 21 intensive care unit patients, we performed TPTD measurements directly before and after chest CT. Based on the density data of segmented CT images we calculated the tissue volume (TV), tissue volume index (TVI), and the mean weighted index of voxel aqueous density (VMWaq)...
April 21, 2018: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29663210/blick-in-die-gene-hilft-nicht-beim-abspecken
#12
C Holzapfel
No abstract text is available yet for this article.
April 2018: MMW Fortschritte der Medizin
https://www.readbyqxmd.com/read/29663019/-retrieval-of-a-migrated-plastic-stent-in-a-51-year-old-man
#13
A Poszler, P Klare, A Weber, M Abdelhafez, K Holzapfel, R M Schmid, S von Delius
BACKGROUND: Endosonographically guided transgastric drainage is the first-line interventional therapy of walled-off necrosis and symptomatic pancreatic pseudocysts in necrotizing pancreatitis. Plastic stents or lumen apposing metal stents are commonly used. A possible complication of endoscopic therapy is stent migration. CASE REPORT: We report upon a 51-year-old man who presented with acute necrotizing pancreatitis. Transgastric necrosectomy was performed and 5 transmural double-pigtail stents (DPS) were left in situ to drain the residual retroperitoneal cavity...
April 16, 2018: Der Internist
https://www.readbyqxmd.com/read/29593095/loss-of-function-pcsk9-mutants-evade-the-unfolded-protein-response-sensor-grp78-and-fail-to-induce-endoplasmic-reticulum-stress-when-retained
#14
Paul Lebeau, Khrystyna Platko, Ali A Al-Hashimi, Jae Hyun Byun, Šárka Lhoták, Nicholas Holzapfel, Gabriel Gyulay, Suleiman A Igdoura, David Cool, Bernardo Trigatti, Nabil G Seidah, Richard C Austin
The proprotein convertase subtilisin/kexin type-9 (PCSK9) plays a central role in cardiovascular disease (CVD) by degrading hepatic low-density lipoprotein receptor (LDLR). As such, loss-of-function (LOF) PCSK9 variants that fail to exit the endoplasmic reticulum (ER) increase hepatic LDLR levels and lower the risk of developing CVD. The retention of misfolded protein in the ER can cause ER stress and activate the unfolded protein response (UPR); in this study, we investigated whether a variety of LOF PCSK9 variants that are retained in the ER can cause ER stress and hepatic cytotoxicity...
March 28, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29580793/comparison-of-in-vivo-vs-ex-situ-obtained-material-properties-of-sheep-common-carotid-artery
#15
Marija Smoljkić, Peter Verbrugghe, Matilda Larsson, Erik Widman, Heleen Fehervary, Jan D'hooge, Jos Vander Sloten, Nele Famaey
Patient-specific biomechanical modelling can improve preoperative surgical planning. This requires patient-specific geometry as well as patient-specific material properties as input. The latter are, however, still quite challenging to estimate in vivo. This study focuses on the estimation of the mechanical properties of the arterial wall. Firstly, in vivo pressure, diameter and thickness of the arterial wall were acquired for sheep common carotid arteries. Next, the animals were sacrificed and the tissue was stored for mechanical testing...
March 23, 2018: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29551016/determination-of-optimized-growth-medium-and-cryoprotective-additives-to-enhance-the-growth-and-survival-of-lactobacillus-salivarius
#16
Soyoung Yeo, Hee Sung Shin, Hye Won Lee, Doseon Hong, Hyunjoon Park, Wilhelm Holzapfel, Eun Bae Kim, Chul Sung Huh
Beneficial effects of lactic acid bacteria (LAB) have been intensively investigated in recent decades with special focus on modulation of the host intestinal microbiota. Numerous discoveries of effective probiotics are driven by a significantly increasing demand for dietary supplements. Consequently, technological advances in the large-scale production and lyophilization are needed by probiotic-related industries for producing probiotic LAB for commercial use. Our study had a dual objective, i.e., to determine the optimum growth medium composition and to investigate appropriate cryoprotective additives (CPAs) for Lactobacillus salivarius , and compare its responses with other Lactobacillus species...
March 16, 2018: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29516607/amodiaquine-improves-insulin-resistance-and-lipid-metabolism-in-diabetic-model-mice
#17
Hoe-Yune Jung, Bobae Kim, Hye Guk Ryu, Yosep Ji, Soyoung Park, Seung Hee Choi, Dohyun Lee, In-Kyu Lee, Munki Kim, You Jeong Lee, Woojin Song, Young Hee Lee, Hyung Jin Choi, Chang-Kee Hyun, Wilhelm H Holzapfel, Kyong-Tai Kim
AIMS: Although peroxisome proliferator-activated receptors (PPARs)α/γ dual agonists can be beneficial for treatment of dyslipidemia in patients with type 2 diabetes, their use is limited owing to various side effects, including body weight gain, edema, and heart failure. We aimed to demonstrate that amodiaquine, an antimalarial agent, has potential as a PPARα/γ dual agonist with low risk of adverse effects. METHODS: We screened a Prestwick library (Prestwick Chemical; Illkirch, France) to identify novel PPARα/γ dual agonists and selected amodiaquine (4-[(7-chloroquinolin-4-yl)amino]-2-[(diethylamino)methyl]phenol), which activated both PPAR-α & -γ, for further investigation...
March 8, 2018: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/29514074/non-invasive-measurement-of-brown-fat-metabolism-based-on-optoacoustic-imaging-of-hemoglobin-gradients
#18
Josefine Reber, Monja Willershäuser, Angelos Karlas, Korbinian Paul-Yuan, Gael Diot, Daniela Franz, Tobias Fromme, Saak V Ovsepian, Nicolas Bézière, Elena Dubikovskaya, Dimitrios C Karampinos, Christina Holzapfel, Hans Hauner, Martin Klingenspor, Vasilis Ntziachristos
Metabolism is a fundamental process of life. However, non-invasive measurement of local tissue metabolism is limited today by a deficiency in adequate tools for in vivo observations. We designed a multi-modular platform that explored the relation between local tissue oxygen consumption, determined by label-free optoacoustic measurements of hemoglobin, and concurrent indirect calorimetry obtained during metabolic activation of brown adipose tissue (BAT). By studying mice and humans, we show how video-rate handheld multi-spectral optoacoustic tomography (MSOT) in the 700-970 nm spectral range enables non-invasive imaging of BAT activation, consistent with positron emission tomography findings...
March 6, 2018: Cell Metabolism
https://www.readbyqxmd.com/read/29498442/vitis-vinifera-berry-metabolic-composition-during-maturation-implications-of-defoliation
#19
Gerhard C Rossouw, Katja Šuklje, Jason P Smith, Celia Barril, Alain Deloire, Bruno P Holzapfel
Leaves are an important contributor toward berry sugar and nitrogen (N) accumulation, and leaf area, therefore, affects fruit composition during grapevine (Vitis vinifera) berry ripening. The aim of this study was to investigate the impact of leaf presence on key berry quality attributes in conjunction with the accumulation of primary berry metabolites. Shortly after the start of véraison (berry ripening), potted grapevines were defoliated (total defoliation and 25% of the control), and the accumulation of berry soluble solids, N and anthocyanins were compared to that of a full leaf area control...
March 2, 2018: Physiologia Plantarum
https://www.readbyqxmd.com/read/29479659/in-vivo-estimation-of-passive-biomechanical-properties-of-human-myocardium
#20
Arnab Palit, Sunil K Bhudia, Theodoros N Arvanitis, Glen A Turley, Mark A Williams
Identification of in vivo passive biomechanical properties of healthy human myocardium from regular clinical data is essential for subject-specific modelling of left ventricle (LV). In this work, myocardium was defined by Holzapfel-Ogden constitutive law. Therefore, the objectives of the study were (a) to estimate the ranges of the constitutive parameters for healthy human myocardium using non-invasive routine clinical data, and (b) to investigate the effect of geometry, LV end-diastolic pressure (EDP) and fibre orientations on estimated values...
February 26, 2018: Medical & Biological Engineering & Computing
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