11 results on '"Betz P"'
Search Results
2. DOES THE USE OF DYNAMIC SURGICAL GUIDANCE ASSIST ACCURATE PEDICLE SCREW PLACEMENT IN PATIENTS WITH OSTEOPOROSIS OR OSTEOPENIA?
- Author
-
HELTON L A DEFINO, JOHN WILLIAMS, GEORGIA-LEA WILLIAMS, KERI GEORGE, RANDAL BETZ, DAVID POWELL, JOHN GAUGHAN, and MAURICE BOURLION
- Subjects
Orifice Valves ,Fluoroscopy ,Bone Diseases, Metabolic ,Bone Screws ,Orthopedic surgery ,RD701-811 ,Diseases of the musculoskeletal system ,RC925-935 - Abstract
ABSTRACT Objective To compare the use of a dynamic surgical guide (PediGuard®) and pilot hole preparation, with the use of a probe and the aid of fluoroscopy in osteoporotic or osteopenic patients undergoing pedicular fixation of the thoracic or lumbar spine. Methods One hundred and eight patients were randomized. A pilot hole was prepared with the dynamic surgical guide (PediGuard®), or with a probe with the aid of fluoroscopy. A total of 657 vertebral pedicles (120 thoracic and 180 lumbar) were included in the study. The parameters used for the comparison were: accuracy of the pedicular screw, number of fluoroscopic shots, and change in intraoperative trajectory of the perforation after detecting pedicle wall rupture. Results In the group with use of the dynamic surgical guide, malpositioning of the pedicle screws was observed in 8 (2.6%) patients and intraoperative change of perforation trajectory in 12 (4%) patients, and there were 52 fluoroscopic shots. In the group without use of the dynamic surgical guide (PediGuard®), misplacement of the pedicle screws was observed in 33 (11%) patients and intraoperative change of perforation trajectory in 47 (13.2%) patients, and there were 136 fluoroscopic shots. Conclusion The use of the dynamic surgical guide (PediGuard®) in patients with osteoporosis or osteopenia enabled more accurate placement of pedicular screws, with less change in the intraoperative course of the perforation and less intraoperative radiation. Level of Evidence II; Randomized clinical trial of lesser quality.
- Published
- 2020
- Full Text
- View/download PDF
3. NATIVISM AND THE SUCCESS OF POPULIST MOBILIZATION
- Author
-
Hans George-Betz
- Subjects
Political science ,Political science (General) ,JA1-92 - Abstract
The history of nativism has been exhaustively studied and analyzed. One of the most controversial aspects of this literature pertains to the relationship between nativism and populism. Its exact nature, however, is unclear and calls for investigation. The main objective of this article is to shed light on a question that goes to the very heart of the current debate on radical right-wing populism: namely, what is the place and role of nativism in populist mobilization
- Published
- 2018
4. Rezension des „Corpus Oral de Referencia de la Lengua Española Contempóranea'
- Author
-
Katrin Betz
- Subjects
20th century ,corlec ,orthographic transcription ,spanish ,spoken language ,History of scholarship and learning. The humanities ,AZ20-999 ,Information resources (General) ,ZA3040-5185 - Abstract
In this paper we review the „Corpus Oral de Referencia de la Lengua Española Contempóranea“. This corpus is a carefully compiled text collection of orthographically transcribed recordings of oral conversations. As it was compiled as a reference corpus, it provides texts of different styles and registers and has a considerable size of about 1,100,000 words. CORLEC therefore is an important resource for researchers interested in the field of spoken language. The Corpus is freely available as SGML-based-files or plain-text-files. As both variants are similar in their structure and content, the review addresses the two formats. The review first provides some background information and an overview of the structure of the corpus. Then, the transcription files are described in their structure and content. Eventually, a short overview of the integration of the corpus into other projects and a résumé are given.
- Published
- 2018
- Full Text
- View/download PDF
5. NATIVISM AND THE SUCCESS OF POPULIST MOBILIZATION
- Author
-
Hans George-Betz
- Subjects
Political science ,Political science (General) ,JA1-92 - Abstract
The history of nativism has been exhaustively studied and analyzed. One of the most controversial aspects of this literature pertains to the relationship between nativism and populism. Its exact nature, however, is unclear and calls for investigation. The main objective of this article is to shed light on a question that goes to the very heart of the current debate on radical right-wing populism: namely, what is the place and role of nativism in populist mobilization
- Published
- 2018
6. 'El Capital' y el keynesianismo monetario
- Author
-
Karl Betz
- Subjects
El capital ,Marx ,Keynes ,Economic history and conditions ,HC10-1085 ,Economic theory. Demography ,HB1-3840 ,Economics as a science ,HB71-74 - Abstract
[p. 93] Resumen: Si se considera el objeto de El capital como el desarrollo de las categorías económicas, entonces puede aprehenderse su construcción como la sucesión de diversos niveles teóricos. Bajo esta perspectiva, se pretende mostrar que esta sucesión no se completó para el nivel alcanzado en El Capital y que el paso a las categorías fundamentales de una económica Ökonomik/ keynesiano-monetaria es posible.
- Published
- 2018
- Full Text
- View/download PDF
7. Anticipation of vertebral pedicle breach through dynamic surgical guidance
- Author
-
John Williams, Amer Samdani, Helton Luiz Aparecido Defino, Keri George, John Gaughan, and Randal Betz
- Subjects
Columna vertebral ,Conductividad eléctrica ,Fluoroscopia ,Orthopedic surgery ,RD701-811 ,Diseases of the musculoskeletal system ,RC925-935 - Abstract
OBJECTIVE: To determine the effectiveness of a pedicle probe to anticipate an impending breach and allow redirection during placement of a pilot pedicle hole. METHODS: Purposely four cortical wall sites were drilled: medial and lateral pedicle wall, and lateral and anterior wall of the vertebral body. The surgeon stopped probing when the sound changed, suggesting abutment against the cortical wall ("anticipation" of impending breach). A fluoroscopy image was then obtained. The surgeon then advanced the PediGuard through the cortex until the sound changed, indicating a breach. In the second part of the study three probes were used: 1) DSG (PediGuard) with curved tip with electronics ON; 2) DSG with electronics OFF; 3) standard Lenke probe. After the images were taken, the operating surgeon (blinded to x-rays) was instructed to redirect and continue drilling into the vertebral body. RESULTS: The surgeon accurately anticipated 60 of 75 (80%) of the breaches, 17 of 19 (89%) in the medial pedicle wall. In the second part of the study the DSG with electronics ON was superior to the DSG with electronics OFF as well as the standard Lenke probe (100% vs. 90% vs. 79%, p = 0.0191). CONCLUSION: Successful redirection by passing the pedicle probes into the vertebral body without a breach after anticipation of an impending pedicle wall breach occurred in 100% of the drillings when done with the DSG with the electronics ON vs only 84% when there was no electronic feedback.
- Published
- 2014
- Full Text
- View/download PDF
8. Reduction in radiation (fluoroscopy) while maintaining safe placement of pedicle screws during lumbar spine fusion
- Author
-
Christopher D. Chaput, Keri George, Amer F. Samdani, John I. Williams, John Gaughan, and Randal R. Betz
- Subjects
Fluoroscopía ,Tornillos óseos ,columna vertebral ,Vértebras lumbares ,Exposición a la radiación ,Orthopedic surgery ,RD701-811 ,Diseases of the musculoskeletal system ,RC925-935 - Abstract
OBJECTIVE: The purpose of this study is to report the results using PediGuard (electrical conductivity device) to reduce radiation exposure while drilling the pilot hole for pedicle screw placement. METHOD: Eighteen patients diagnosed with a degenerative lumbar spine, that required a posterior spinal fusion. Average age of the patients were 55 ± 12 years. Patients received postoperative CT scans of all screws. Scans were reviewed by an independent reviewer grading 'in' < 2 mm of breach , or 'out' > 2 mm of breach. In a randomized fashion, the surgeon created pilot holes with either his standard technique or by using the PediGuard. Fluoroscopy was used for each drilling as necessary. Once the pilot hole was created, the surgeon inserted titanium screws into the pedicle pilot holes. A total of 78 screws (39 standard probe and 39 PediGuard ) were analyzed. RESULTS: 78 screws (39 standard probe and 39 PediGuard were analyzed. No significant difference in breach rate > 2mm by either method (p=1.000), with one screw out in each group. Fluoroscopy shots averaged 5.2 (range, 0 to 15), average decrease of 2.3 (30%) per screw in the PediGuard group vs. 7.5 (range, 2 to 17) in the standard group (p< .001). CONCLUSION: This trial to assess pedicle probe location within the pedicle and vertebral body showed the number of fluoroscopy shots were reduced by 30%, compared to a standard probe while maintaining a 97.5% screw placement accuracy.
- Published
- 2013
- Full Text
- View/download PDF
9. Tagungsbericht: Von schwarz-gelben Fußballgottesdiensten und Technopartys in der Kneipe: 'Hybridisierung inszenierter Ereignisse. Zur Diskussion zeitgeistiger Veranstaltungen'
- Author
-
Jasmin Wittkowski and Gregor Betz
- Subjects
Events ,Hybridität ,Modernisierung ,sozialer Wandel ,Ethnografie ,Wissenssoziologie ,Social sciences (General) ,H1-99 - Abstract
Neue Ereignisformate der letzten Jahre – seien dies populärkulturelle Events, private Feste und Feiern, politische Ereignisse, wissenschaftliche Konferenzformate etc. – zeichnen sich oftmals aus durch eine gezielte Kombination und Durchmischung von Ereignissen verschiedener kultureller Bereiche. Diesen hybriden Phänomenen widmeten sich die Referierenden im Rahmen der internationalen Tagung "Hybridisierung inszenierter Ereignisse. Zur Diskussion zeitgeistiger Veranstaltungen", ausgerichtet am 8. und 9. April 2016 in Dortmund. Theoretisch-konzeptuelle Überlegungen fanden dabei ebenso Eingang wie Betrachtungen aus historischer und zeitgenössischer Perspektive. Schwerpunkte waren unter anderem die Hybridisierung in Szenen und des virtuellen Raums sowie die Neudeutung traditionaler Rituale und Anlässe. Neben deren Zusammenfassung zeichnen wir in diesem Tagungsbericht den während der Diskussionen geführten Versuch nach, das weite und diverse Feld uneindeutiger, durchmischter Ereignisse einzugrenzen und eine Definition auszuloten. URN: http://nbn-resolving.de/urn:nbn:de:0114-fqs1603174
- Published
- 2016
10. Conteúdos de métodos computacionais em material instrucional para o ensino de Física
- Author
-
Michel Emile Marcel Betz and Rejane Maria Ribeiro Teixeira
- Subjects
métodos computacionais no ensino de física, softwares educacionais, material instrucional. ,Special aspects of education ,LC8-6691 ,Physics ,QC1-999 - Abstract
É inegável a necessidade do uso de ferramentas computacionais no ensino de Física desde o nível básico. É aconselhável que se promova o estudo envolvendo ferramentas e métodos computacionais já na formação de professores de Física para a escola de nível básico, como nos cursos de Licenciatura. Pois o fato de os professores não se sentirem confortáveis para incorporar metodologias envolvendo essas ferramentas em sua prática de ensino, muitas vezes se deve à falta ou ao desconhecimento de materiais instrucionais que lhes sirvam de motivação e orientação. Procurou-se, neste trabalho, desenvolver um material instrucional utilizando alguns softwares úteis no ensino da Física, que oferecem recursos interessantes e que estão disponíveis para os sistemas operacionais Linux e Windows. Os principais recursos de cada um dos softwares são apresentados a partir de uma situação-exemplo de Física, que serve como ilustração para demonstrar a sua utilização. O primeiro software apresentado é a planilha eletrônica que possui potencial como ferramenta de cálculo e visualização de resultados em gráficos. A seguir, é estudado o software Modellus, bastante conveniente e poderoso na modelagem de sistemas físicos e na montagem de animações. O material ainda aborda os softwares HotPotatoes, que faculta a elaboração de testes eletrônicos, e CmapTools, dedicado à construção de mapas conceituais. Ao final da apresentação de cada software é sugerido um exercício como uma tarefa a ser realizada. Grande parte do material instrucional aqui apresentado foi utilizado em disciplina de Métodos Computacionais no Ensino de Física ministrada no âmbito do Curso de Especialização a Distância “Física para a Educação Básica” destinado ao aprimoramento da formação de professores atuando na rede pública de ensino do Estado do Rio Grande do Sul e oferecido pela UFRGS na integração com o Sistema Universidade Aberta do Brasil.
- Published
- 2012
- Full Text
- View/download PDF
11. World markets and dependence Mercado mundial y dependencia
- Author
-
Betz Karl and Lüken-Klalβen Mathilde
- Subjects
Keynesiano monetario ,teoría monetaria de la producción ,subdesarrollo ,inversión ,dinero ,función externa ,relaciones internacionales ,mercado de divisas ,mercado mundial ,Social Sciences ,Economic history and conditions ,HC10-1085 - Abstract
This work is one of monetary Keynesianism, known as the Berlin School. The school proposes a monetary theory of production which links the real sector to the monetary sector and on this bases offers an explanation of underdevelopment and dependence. Capitalist relationships are seen as the quest for monetary surpluses over money investments; and money not only rules the decisions of economic agents but also govern contractual relations. Each currency is a system of relationships, a "monetary space". Therefore, the theory of international re1ations should include a market whichdoes not exist in models of closed economies the currency market and the specific function of money in this context, i.e. the "external function". World markets have establish a hierarchy of currencies, some strong, others weak. The former enable their national interests to be imposed to the countries with weak currencies and these are relegated to a situation of indebtedness to the strong currencies, dependence and underdevelopment from which very few canescape. Este trabajo se inscribe en el keynesianismo monetario, conocido como "escuela de Berlín". Está escuela propone una teoría monetaria de la producción que vincula la esfera real con la monetaria y con base en ella explica el subdesarrollo y la independencia. Las relaciones capitalistas se caractesizan por la búsqueda de un excedente monetario sobre la inversión en dinero; el dinero no sólo determina los cálculos de los agentes económicos sino que también expresa las relaciones contractuales. Cada moneda expresa un sistema de relaciones, un espacio monetario. Por tanto, la teoría de las relaciones internacionales debe incluir un mercado que no existe en los mercados de economía cerrada, el mercado de divisas, así como la función específica del dinero en este contexto, es decir, la llamada "función externa". El mercado mundial establece una jerarquía monetaria que da lugar a las monedas fuertes y a las monedas débiles; las primeras permiten imponer los intereses nacionales de sus respectivos países y someter a los países con monedas más débiles a una situación de endeudamiento externo, dependencia y subdesarrollo de la que muy pocos pueden escapar.
- Published
- 1994
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.