1,720,980 research outputs found
sj-docx-1-car-10.1177_19476035231164733 – Supplemental material for Total Knee Arthroplasty (TKA): When Do the Risks of TKA Overcome the Benefits? Double Risk of Failure in Patients up to 65 Years Old
No full textSupplemental material, sj-docx-1-car-10.1177_19476035231164733 for Total Knee Arthroplasty (TKA): When Do the Risks of TKA Overcome the Benefits? Double Risk of Failure in Patients up to 65 Years Old by Francesco Perdisa, Barbara Bordini, Manuela Salerno, Francesco Traina, Stefano Zaffagnini and Giuseppe Filardo in CARTILAGE</p
Meniscus Scaffolds for Partial Meniscus Defects.
No full textThe meniscus is a crucial player in knee joint homeostasis. Loss of meniscus tissue can result in early onset of clinical symptoms like pain and loss of function, and structural degeneration of the articular cartilage. In case of a symptomatic segmental defect of the medial or lateral meniscus, different innovative options using biological or synthetic scaffolds are now available to regenerate meniscuslike tissue, with the aim of allowing a satisfactory clinical improvement to patients. However, the role of any of these procedures in terms of chondroprotection is questionable, and the overall outcomes in the long term still can be improved
ACL surgery: reasons for failure and management
Full text linkAbstract
Despite the general success of anterior cruciate ligament reconstructions (ACL-R), there are still studies reporting a high failure rate. Orthopedic surgeons are therefore increasingly confronted with the treatment of ACL retears, which are often accompanied by other lesions, such as meniscus tears and cartilage damage and which, if overlooked, can lead to poor postoperative clinical outcomes. The literature shows a wide variety of causes for ACL-R failure. Main causes are further trauma and possible technical errors during surgery, among which the position of the femoral tunnel is thought to be one of the most important. A successful postoperative outcome after ACL-revision surgery requires good preoperative planning, including a thorough evaluation of patient's medical history, e.g. instability during daily or sports activity, increased general joint laxity, and hints for a low-grade infection. A careful clinical examination should be performed. Additionally, comprehensive imaging is necessary. Besides a magnetic resonance imaging, a CT scan is helpful to determine location of tunnel apertures and to analyze for tunnel enlargement. A lateral knee radiograph is helpful to determine the tibial slope. The range of surgical options for the treatment of ACL-R failure is broad today. Orthopedic surgeons and experts in Sports Medicine must deal with various possible associated injuries of the knee or unfavorable anatomical conditions for ACL-R. The aim of this review was to highlight predictors and reasons of failures of ACL-R as well as describe diagnostic procedures to individualize treatment strategies for improved outcome after revision ACL-R.
Keywords: ACL reconstruction; ACL revision; ACL revision management; causes of graft failure
Cartilage repair: Scaffolding
No full textRegenerative scaffold-based procedures have emerged in the last years as a potential therapeutic option for the treatment of chondral and osteochondral lesions. The rationale of using a scaffold is to have a temporary 3D structure of biodegradable polymers for the growth of living cells. The ideal scaffold should reproduce biological and structural properties of the native tissue as close as possible, in order to allow cell infiltration, attachment, proliferation, and differentiation. Other important properties include biocompatibility and biodegradability at suitable time intervals, to support the initial tissue formation and then to be gradually replaced by the regenerating tissue. The use of scaffolds has been introduced into clinical practice to improve the results obtainable with the first-generation cell-based approach, autologous chondrocyte implantation (ACI), by overcoming its drawbacks and simplifying the procedure. ACI techniques were combined with scaffolds, developing matrix-assisted autologous chondrocyte transplantation (MACT). Cells were harvested and cultured in vitro and then seeded on the three-dimensional biomaterial, which favored the redifferentiation processes, better protection, more homogeneous distribution, and easier handling for surgical implantation. Many scaffolds have reached clinical practice, and studies are now being published with good mid- and long-term results, but showing also some limits. Whereas traumatic focal lesions of the femoral condyles were shown to have more chance of benefit from this treatment, other indications have more controversial results, with lower or even poor clinical outcome. Moreover, this approach suffers from a two-step operation, technical difficulties and regulatory restrictions for cell manipulation, and high costs. Thus, after a decade focused on expanding and improving MACT techniques, in more recent years, both researchers and clinicians have been looking for different solutions to regenerate the articular surface
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
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