1,720,961 research outputs found
Una tecnica innovativa per la ricostruzione del legamento crociato craniale nel cane: dalla ricerca alla clinica
No full textTask 1: studio preclinico; Task 2: studio biomeccanico; Task 3: validazione translator device; Task 4: Studio clinico
Una tecnica innovativa per la ricostruzione del legamento crociato craniale del cane: dalla ricerca alla clinica
No full textTask 1: studio preclinico; Task 2: studio biomeccanico; Task 3: validazione translator device; Task 4: Studio clinic
Radiographic measurement of cranial tibial translation using a simple device in dogs
No full textThis study was designed to objectively quantify in vivo the cranial tibial translation in order to assess the integrity of cranial cruciate ligament (CrCL) in dogs. The hypothesis of this study was that changes in CrCL integrity would result in detectable changes in tibial translation.
To carry out a validation of the translator device, data from injured stifles (PA, n=20), contralateral stifles (CO, n=20) and healthy stifles (HE, n=20) were compared estimating sensitivity, specificity, positive and negative predictive values, and accuracy of the diagnostic test. Medio-lateral radiographic projections were obtained in each stifle, before and during standard thrust force application (49 N, horizontal plane, cranial direction) to measure the absolute tibial translation (ΔS). ΔS was normalized (ΔN) to tibial width to get data regardless of dog’s size.
A large discrepancy in ΔN values between HE (13.28±4.60, range 5.9-19.0) and PA (49.75±13.35, range 31.25-66.67) was observed. CO showed intermediate level of ΔN (20.62±8.00, range 8.57-38.78). Comparing PA with clinically healthy stifles (HE and CO), at the ΔN cut-off value (31.25%), a diagnosis of CrCL rupture could be issued with very high probability (95%). Comparing HE with CL, at the ΔN cut-off value (13.79%), although both not pathological, it was possible to obtain moderate levels of sensitivity, specificity, positive and negative predictive value, and accuracy.
The translator device could be considered a useful tool to objectively quantify, in vivo, the cranial tibial translation in dogs. It could be used in case of CrCL rupture before surgery and during post-operatory follow-up
Innovative, intra-articular, prosthetic technique for cranial cruciate ligament reconstruction in dogs: a cadaveric study
Full text linkThe purpose of this study was to describe and assess the feasibility of a new intra-articular approach in the treatment of cranial cruciate ligament deficiency in dogs using an artificial ligament and a new bone-anchor system. Twelve canine cadavers weighting 26 to 45 kg were used in this ex-vivo study. Special tibial and femoral screws, two helicoils, and a high resistance artificial fiber compose the implant. Surgery was performed using the mean cranio-lateral approach to the stifle joint. Helicoil and tibial screw, connected to the fiber, were inserted in the center of the tibial insertion area of the cranial cruciate ligament. The fiber was passed over-the-top, tensioned, and fixed to the femoral screw, previously inserted with the helicoil in the distal part of the femur. Surgery was completed in all the cases. Occasional problems found during the insertion of the helicoils and screws were resolved with simple procedures. Post-operative clinical assessment showed negative cranial drawer test, negative cranial tibial thrust, and normal range of motion. Radiographic evaluation showed an appropriate positioning of both tibial and femoral implants in all the cases. The results of the first surgical appraisal of this new technique are encouraging, although further studies are necessary to demonstrate the in vivo efficacy of this procedure
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
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
- …
