1,721,013 research outputs found
Clinical evaluation about femoral crosspin fixation in ACL reconstruction with autogenous patellar tendon autograft : a retrospective five years study
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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
Long-term results of abrasion arthroplasty of the medial femoral condyle of the knee for full-thickness chondral defects
No full textObjectives: Abrasion arthroplasty is a technically simple and low cost procedure compared to other treatments for full thickness chondral injury. Nevertheless, there is little data on the long-term outcomes of this procedure. We present our results of medial femoral condyle abrasion arthroplasty, with a minimum 10-year follow-up. To our knowledge, this is the longest follow-up to date for this procedure.
Methods: From 3/1990 to 12/2001, 76 consecutive patients (37 male and 39 female) suffering from a full thickness chondral defect of the medial femoral condyle underwent abrasion arthroplasty performed by a single surgeon. The average age of the cohort was 65 yrs (range:24-79,SD 15.44 yrs). Inclusion criteria were having undergone abrasion arthroplasty, with a minimum 10-yr follow-up (mean 16.1 yrs, range 10.2yrs-20.1yrs,SD 3.26). Patients with ligament injuries, multiple compartment involvement, varus angulation >10° and inflammatory arthritis were excluded from the study.
Preoperative weight bearing radiographs were obtained in all cases. At final f-u patients completed a questionnaire based on their current knee symptoms and need for further surgery. The questionnaire included the IKDC subjective score and a question regarding medication used for the operated knee. Patients were considered to have a successful result if they had no pain or only occasional pain with activity, no limitation of their activities due to the knee, and had not undergone repeat surgery.
Results: 65 patients (85.5%) were available for follow-up (3 patients died and 8 were lost at f-u). Patients with lesions less that 4cm2 (n=30) had a 73% success rate at final f-u. Patients with lesions greater than 4cm2 (n=32) had a 21% success rate which was statistically significant (p< 0.005).
The differences in outcome with regard to meniscectomy, as well as the difference in distribution of large lesions between the two patient groups were not statistically significant. Patient's age did not affect outcomes, although there was a trend of poor outcomes associated with age of 50 years or older. The overall re-operation rate was a 31%. Re-operation was on average 6.2 yrs after the arthroscopic procedure.
Conclusions: Abrasion arthroplasty aims to seal full thickness chondral defects, avoiding the continued degeneration that is the natural history of such lesions. It is a temporary measure to delay the progression of arthritis. In our series it seems that dimensions of the lesion was crucial for the quality of the result. The procedure is effective in minimizing the progression of symptoms at long-term follow-up for small lesions, regardless of patient age. The trend toward poor outcomes in patients over fifty is likely due to the higher percentage of large or lesions rather than patient age itself. Abrasion arthroplasty should not be performed in patients with chondral lesions larger than 4 cm2
Prevention of venous thromboembolism after knee arthroscopy : six years experience with the low molecular weight nadroparin calcium
No full textAim. Knee arthroscopy is the most common orthopedic procedure, but few data are available on the epidemiology of venous thromboembolism (VTE) after this kind of surgery. From this point of view, knee arthroscopy is considered a low-risk intervention, and clear indications for antithrombotic prophylaxis in this setting are lacking. Methods. From January 2000 to December 2006 we prospectively evaluated 1 800 patients undergoing knee arthroscopy, and considered at particularly low risk of VTE (no concomitant known risk factors, tourniquet time less than 30 min). These patients received weight-adjusted low molecular weight heparin (nadroparin calcium, 2 850 to 5 700 IU, one subcutaneous injection per day starting 6 hours after arthroscopy) for two weeks. Patients were followed-up for two weeks for the occurrence of symptomatic, instrumentally confirmed VTE, and/or bleeding episodes. Results. Seven cases of distal deep vein thrombosis were documented (overall incidence of VTE was 0.38%). The most frequent registered adverse events were mild hemarthrosis and reactions at injection site; no cases of major bleeding occurred. Conclusion. In this large cohort of low-risk patients, VTE appears as a possible complication of knee arthroscopy, though at an extent probably lowered by the systematic use of antithrombotic prophylaxis. The present study seems to support the feasibility of pharmacological antithrombotic prophylaxis in these patients, with encouraging indications as for benefit/risk ratio. Our experience might stimulate further efforts to better assess and face this open medical issue
Custom-made Articulating Spacer in Two-stage Revision Total Knee Arthroplasty : An Early Follow-up of 14 Cases of at Least 1 Year After Surgery
No full textTotal knee replacement (TKR) infection represents only a small percentage of all the potential complications in joint replacement, but one that can lead to disastrous consequences. Two-stage revision, which has been proven to be the most effective technique in eradicating infection, includes prosthesis removal, positioning of an antibiotic-loaded spacer, and systemic antimicrobial therapy for at least 6 weeks. It has been suggested that there is better performance in terms of range of motion, pain, extensor mechanism shortening, and spacer-related bone loss if articulating spacers are used instead of fixed spacers. In this paper, we describe our results in two-stage revision of infected total knee arthroplasty with a minimum follow-up of 12 months on 14 patients treated by antibiotic-loaded custom-made articulating spacer as described by Villanueva et al. (Acta Orthop 77(2):329-332, 2006). The mean flexion achieved after the second stage of the revision was 120 degrees , ranging from 97 degrees to 130 degrees. The mean Hospital for Special Surgery score was 84. At 1 year after surgery, none of the knees showed any evidence of recurrence of the infection. Articulating spacers are a suitable alternative to fixed spacers with good range of motion after reimplantation and effectiveness against total knee replacement deep infections
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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