1,720,967 research outputs found
Intercalary allograft reconstruction in a patient with large tibial defect: Case report
No full textA fit 26 year-old-man presented to our Department with an open fracture of the left tibial shaft (AO 42-C3). The fracture was initially treated with an External Fixator, which was replaced by an intramedullary Grosse Kempf nail after 4 months. In the following year he developed an atrophic non-union and we witnessed the increasing bone resorption at the fracture site which led to the nail breakage. An accurate CT pre-operative planning was made and a revision surgery was successfully performed: the broken nail was removed and intercalary allograft reconstruction was made, using a compressible intramedullary nail. Whereas in literature it is well described how intercalary allografts can be used to fill the massive diaphyseal defects after tumor resections, we assumed it could also be an adequate technique to treat a large bone defect at a non-union site. (C) 2018 Elsevier Ltd. All rights reserved
Double plating for bicolumnar distal humerus fractures in the elderly
No full textDistal humerus fractures are uncommon injuries requiring specific clinical and radiographic analysis in order to plan the optimal therapeutic strategy. In particular, bicolumnar distal humerus fractures (Type A2, A3 and C) are complex fractures. In the last years, double plating fixation became the standard treatment: this procedure helped surgeons to obtain a stable and anatomical fixation and an early mobilization, which is the main outcome for obtaining valuable functional results. In this retrospective study, we evaluated the use of open bicolumnar 90-90 plating for fixation of acute fragility fractures of the distal humerus in elderly patients, using the olecranon osteotomy as surgical approach. (C) 2017 Elsevier Ltd. All rights reserved
One-stage procedure for open tibial fractures: feasible without orthoplastic surgery?
No full textBackground: Open tibial fractures are mostly the result of high-energy traumas and often involve severe injuries with extensive bone and soft tissue loss, damage of muscles and neurovascular structures. Over recent- years, - the growth of Ortho-Plastic teams, as a well-coordinated bone, joint and soft tissue treatment, contributed to change the approach to these fractures and to achieve higher successful results in lower limb salvage. Unfortunately, many hospitals cannot benefit of a combined team in emergency, and the orthopedic surgeon is forced to manage personally these kinds of traumas. Methods: We retrospectively reviewed all the open tibial fractures treated at our Orthopaedic Department over the last 10 years, in order to assess the treatments performed (one-stage fixation with Intramedullary Nailing or Open Reduction Internal Fixation - ORIF, versus two/multiple-stage fixation with temporary External Fixation followed by nailing or ORIF) and the differences in the outcome between the different methods. Purpose: Based on our experience and review of the literature, the purpose of this paper is to define what cases can be managed by a single-stage orthopaedic approach, and when the orthopaedist should lay down his arms in favor of other specialties
Surgical treatment of critical size bone defects with Masquelet technique versus bone transport: a systematic review and meta-analysis of comparative studies
No full textIntroduction: To date, the management of critical-sized bone defects lacks a universally accepted approach among orthopedic surgeons. Currently, the main options to treat severe bone loss include autologous grafting, free vascularized bone transfer, bone transport and induced-membrane technique. The purpose of this study is to critically compare the outcomes of Masquelet technique and bone transport to provide a higher level of evidence regarding the indexed techniques. Material and methods: The authors conducted a systematic search on several databases according to the PRISMA guidelines. English-written reports comparing outcomes of the Masquelet technique versus the bone transport technique in patients with critical-sized defects in lower extremities were included. Results: Six observational studies involving 364 patients were included. The systematic review and meta-analysis of pooled data showed no significant difference in most outcomes, except for ASAMI bone outcomes and residual deformity, which showed better results in the bone transport group. The 64% of patients treated with Masquelet technique obtained excellent/good bone ASAMI results compared to 82.8% with bone transport (p = 0.01). Post-operative residual deformity was 1.9% with the bone transport method versus 9.7% with the Masquelet technique (p = 0.02). Conclusions: Both the Masquelet technique and bone transport showed comparable results for the management of critical-sized bone defects of the lower limb. However, these findings must be carefully interpreted due to the high risk of bias. Further prospective randomized controlled trials are necessary to better clarify the strengths and limitations of these two techniques and to identify the variables affecting the outcomes
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
Evaluation of blood loss and implant alignment after total knee arthroplasty with inertial based extramedullary femoral cutting guide
No full textPurpose The purpose of this study was to compare, in terms of blood loss and implant alignment, a new generation of smart extramedullary (EM) cutting guides with the conventional intramedullary (IM) guide for total knee arthroplasty (TKA). The hypothesis was that the EM system would result in less blood loss and fewer days of hospitalization, while ensuring equal or higher accuracy in the alignment of the femoral implant. Methods Thirty-six patients were enrolled for the present study: 18 patients underwent TKA using the EM guide and for the other 18 patients the IM guide was used. Preoperative and postoperative X-rays were acquired. The preoperative and postoperative hemoglobin values were compared. Lastly, length of hospital stay was recorded. Results The hemoglobin difference was significantly lower in the EM group. The alignment of the prosthetic femoral implant in the two groups was comparable but all patients in the EM cohort had a final alignment within 3 degrees of range on the frontal view, while 22% of the patients in the IM cohort had a final alignment exceeding 3 degrees of range. The mean hospitalization duration showed no significant difference between groups, though EM group showed 1.6 days less compared with IM group. Conclusions The inertial-based EM guide system couldbeusefulfordecreasingblood loss compared with conventional guide. This device tended to have better results even in terms of accuracy, but this difference was not significant. Level of Evidence This is a level II, prospective cohort study
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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