1,721,009 research outputs found
Ricostruzione endoscopica del legamento crociato anteriore con innesto dal tendine quadricipitale e fissazione rigida: tecnica chirurgica
No full textWe present a new technique for the anterior cruciate ligament reconstruction, using a graft from the quadriceps tendon, in order to avoid the most common complications related to the use of the middle third of the patellar tendon or the hamstring grafts. The quadriceps tendon graft has biomechanical characteristics which are similar to those of the patellar tendon and of the hamstring grafts, thus allowing an ideal fixation on the bony end. There still are many doubts concerning the free end fixation, just as happens with the hamstring graft. Since 2000, a new method of femoral fixation has been available. This method uses two bioabsorbable pins (Rigid-Fix, Mitek, Ethicon, Westwood, Massachusetts, U.S.A.), for both the bone blocks and the soft-tissue ends. We describe the technique for the use of the quadricep's tendon graft with the soft end fixed to the femur by the Rigid-Fix system. The advantages of this technique are: reduced problems at the donor site, a cross sectional area 1.8 bigger than the patellar tendon graft, the transcondylar bioabsorbable fixation that gives the possibility to obtain a growth of the fibres by inserting the nails through the fibres of the graft, with a following enlargement of the tendon-bone contact area at reaming level. This technique, moreover, avoids the risk of secondary effects such as the windshield wiper effect and the bungee effect, caused by the unsatisfactory tibial fixation of the soft tissues. The use of the quadriceps tendon pro-ACL in the primary reconstruction, as a standard, is advisable in case of pre-operative pain in the anterior area, or when the patient does a working or sporting activity in a genuflected position
La tecnica di prelievo del tendine quadricipitale come innesto per la ricostruzione del LCA
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Acl reconstruction with quadriceps tendon graft: preliminary results of a new fixation tecnique
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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
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