1,721,213 research outputs found
The cemented total hip
No full textCemented total hip replacement is becoming less popular, particularly on the acetabular side. This is in spite of the fact that in most countries with registries the results of cemented hips are outperforming those of cement less hips. The difference is particular profound in older patients and on the femoral rather than the acetabular side. The author contends that a capable orthopedic surgeon should be able to perform a well cemented total hip replacement. There are a number of steps that add 5– 10 minutes to the operation, but these are not technically difficult. In fact, the author maintains that it is easier to perform a cemented total hip replacement than an uncemented total hip replacement. The steps are logical; component positioning is easy and the subsequent revision, if ever required, is a straight forward procedure. In conclusion, the author believes that cemented total hip replacement is an excellent option in all age groups. There is no evidence in the literature in registry series to counteract this assumption. The procedure does stay slightly longer, but the steps are logical and relatively straight forward. The intermediate and long-term results are excellent, and revision of a failed cemented hip is a straightforward 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
CORR Insights® : loss of cement-bone interlock in retrieved tibial components from total knee arthroplasties
No full textMost surgeons cement the tibial component in total knee\ud
replacement surgery. Mid-term registry data from a number\ud
of countries, including those from the United Kingdom and\ud
Australia, support the excellent survivorship of cemented\ud
tibial components. In spite of this success, results can\ud
always be improved, and cementing technique can play a\ud
role. Cementing technique on the tibia is not standardized,\ud
and surgeons still differ about the best ways to deliver\ud
cement into the cancellous bone of the upper tibia. Questions\ud
remain regarding whether to use a gun or a syringe to\ud
inject the cement into the cancellous bone of the tibial\ud
plateau . The ideal cement penetration into the tibial plateau is debated, though most reports suggest that 4 mm\ud
to 10 mm is ideal. Thicker mantles are thought to be\ud
dangerous due to the risk of bone necrosis, but there is little\ud
in the literature to support this contention..
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
Future of arthroplasty : registries and outcome measures
No full textSince the inception of the first Joint Registry in Sweden in 1979, many countries including Finland, Norway, Denmark, Australia, New Zealand, Canada, Scotland, England and Wales now have more than 10 years experience and data, and are collecting data on more than 90% of the procedures performed nationally. There are also Joint Registries in Romania, Slovakia, Slovenia, Croatia, Hungary, France, Germany, Switzerland, Czech Republic, Italy, Austria and Portugal, and work is ongoing to develop a Joint Registry in the US..
Hypothetical model of hydrophilic lubrication in synovial joints
No full textThis paper presents a new insight into the mechanism of biolubrication of articulating mammalian joints that includes the function of surface-active phospholipids (SAPLs). SAPLs can be adsorbed on surface of cartilage membranes as a hydrophobic monolayer (H-phobic-M Madel or Hills' Model) or as a newly proposed hydrophilic bilayer (H-philic-B Model). With respect to the synovial joint's frictionless work, three processes are identified namely: monolayer/bilayer phospholipids binding to cartilage with lubricin interaction; influence of induced-pressure on interaction of hyaluronan with phospholipids; and biolubrication arising from two gliding articular hydrophilic surfaces acting as reverse micelle. Lubricin is considered to play critical role as a supplier of phospholipids, which overlay the articular surface of articular cartilage. Hyaluronic acid is considered to play a critical mediating role in the interaction between the hydrophilic part of phospholipids, the articular surface and water (hydration) in facilitating the lubrication process. Tivo models of frictionless lubrication processes, namely hydrophobic (H-phobic-M Model) and our conceptual hydrophilic (H-philic-B Model), are compared. © Institution of Engineers Australia, 2008
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
Author reply : cement-in-cement revision for selected Vancouver type B1 femoral periprosthetic fractures : a biomechanical analysis
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