1,720,957 research outputs found
Osteofibrodisplasia de Campanacci
No full textLa osteofibrodisplasia regresiva de los huesos largos o displasia de Campanacci fue descrita por primera vez como entidad clínica autónoma por Campanacci en 1976. Es una enfermedad benigna que aparece sobre todo en niños menores de 10 años y afecta a la tibia y al peroné. La lesión se caracteriza por una osteólisis excéntrica intracortical que puede acompañarse de una incurvación anterior o en varus-valgus de la diáfisis. El examen histológico muestra una proliferación de tejido fibroso que engloba una red de finas trabéculas óseas, rodeada de osteoblastos activos. La inmunohistoquímica es positiva, en el 85 % de los casos, con anticuerpos anticitoqueratinas. Este fenómeno ha permitido que algunos autores subrayen la similitud de la enfermedad con el adamantinoma. La patogenia de la osteofibrodisplasia y su diagnóstico diferencial con el adamantinoma son objeto de numerosas discusiones.
La lesión evoluciona generalmente hacia una curación espontánea tras la pubertad. La tasa de recidiva es muy elevada en los casos tratados quirúrgicamente antes de los 10 años. Por esta razón, la mejor actitud antes de esta edad es el control. La intervención quirúrgica sólo está indicada en las osteofibrodisplasias altamente agresivas y en los casos que se acompañan de importantes deformaciones esqueléticas o con riesgo de fractura patológica
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Ricostruzioni pericotiloidee utilizzando trapianti massivi
No full textSurgical techniques in acetabular revision for bone loss are related to the size and localization of acetabular defects, as described by Paprosky and revised by Italian Group of Revision prosthesis (GIR). In larger defects there is a definite indication for massive allografts.
The use of these allografts should depend from a strict selection of the graft, performed in cooperation with the tissue bank and using accurate radiological studies (CT); grafts should be reinforced with metal cages and cups with large head diameter to avoid dislocations. In our experience we prefer performing a pressurized cementing of the allograft before applying the metal cage. It is mandatory to obtain a good bone-to-bone contact between osteotomies, and the fixation must be reinforced on the posterior column.
In addition to a large head diameter, a snap-fit cup may be used. Significant attention should also be paid to muscular reattachment for functional outcome and antibiotic prophylaxis must be performed due to the higher risk of infection in revision surgery. By following these instructions results of massive allografts for periacetabular reconstructions may be superior to custom-made metallic prostheses, as shown by many Authors. In the end, even if not free from major complications, massive allograft reconstruction still remain of primary interest and is the main option in hip revision surgery in cases of large bone defects
Surgical indications of metastatic bone disease
No full textMetastatic bone disease is nowadays avery requent
pathology.
This is due both to prolonged survival of cancer patients and to elective localization to bone of metastases
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Reconstruction of Large Skeletal Defects of the Extremities with: C. Free Vascularized Fibula Graft Plus Bone Allograft after Intercalary Resection in Malignant Bone Tumor
No full textReconstruction of Large Skeletal Defects of the Extremities with: C. Free Vascularized Fibula Graft Plus Bone Allograft after Intercalary Resection in Malignant Bone Tumo
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