1,720,966 research outputs found
3Dprinting in orthopedic oncology surgery
No full text“3D printing” is a common term that refers to a large variety of additive-based technologies which operate on the principle of converting a computer-generated 3D image into a physical model. 3D printed parts can assume virtually any complex shape, with solid and porous components that can be combined to provide the best combination of strength and performances. Currently, the primary applications for 3D printing are the production of anatomical models for planning and surgery simulation, patient-specific instruments and custom-made prosthesis. Orthopedic oncological surgery often requires, for its own nature, accurate and often wide resections of bone and soft tissues involved by the tumoral mass or next to it. one of the latest and most promising innovations is represented by the 3D printing technology, whose main advantage, in this field of application, is represented by the patient-specificity, essential in a surgery that demands high precision and maximal respect for the patients’ healthy native bones and soft tissues. As a rule, 3D printing technique finds application, in oncological orthopedics, in the following major fields: 1) 3D printing for pre-operative planning and training in oncological orthopedics; 2) 3D printed surgical cutting; guides in oncological orthopedics; 3) 3D printed custom made prosthesis
Chronic Tear of the Distal Triceps Tendon Treated with Suture Anchors and Fascia Lata Allograft: Case Report, Surgical Technique and Literature Review
No full textChronic tears of the distal triceps tendon are extremely uncommon lesions. Surgical therapy can be performed with a direct reattachment of the 2 sides of the lesion or-in case of significant tendon retraction-using grafts to fill the resulting gap. Herein, we report a case of a torn distal triceps tendon that occurred in a 33-year-old patient suffering from paraplegia. The resulting functional impairment of the elbow impeded her to use a wheelchair, causing a substantial limitation to her mobility and autonomy. Preoperative clinical evaluation, x-rays, muscle-tendon ultrasound, and magnetic resonance imagingwas been performed. In consideration of a 6 cm retraction at the surgery, we reconstructed the tendon using a combination of suture anchors (5 mm Super Reevo ConMed) and a cadaver fascia lata allograft. After surgery, the elbow was immobilized in extension inside a brachio-metacarpal cast for 30 days. In the following month, the cast was replaced with a hinged elbow brace and progressive mobilization was permitted. Five months postoperatively, the patient regained her previous active flexion-extension articular ROM and was able to use her wheelchair again. No complication occurred
Use of Statins and Hip Fracture Risk: a Case-Control Study
No full text: PURPOSE OF THE STUDY To evaluate a possible association between hip fracture and statin use. MATERIAL AND METHODS In this case-control study we compared the use of statins between two groups of 210 patients: the first group (case group) included patients hospitalized for hip fractures while the second group (control group) included patients who did not suffer femur bone injuries. The two groups were matched for age, sex, year of hospitalization and possible confounding factors. Inside the group of cases, we also evaluated the differences in terms of fracture type, presence of previous fragility fracture and mortality between statin users and non-users. RESULTS The use of statins was most common among patients without previous fractures (OR=0.54; 95% CI=0.33-0.89; p=0.0138), especially in older patients (OR=0.40; 95% CI=0.22-0.76). We did not find any significant difference in statin intake between men and women in the control group. In the case group, those who did not use statins were more likely to undergo a medial hip fracture (28.5% vs 16.1%). Patients from case group also presented a greater mortality (27.9% vs 19.35%) and an higher percentage of previous hip fractures (20.11% vs 9.7%). However, they didn't presented a significant higher rate of fragility fractures in other sites. DISCUSSION AND CONCLUSIONS Our study suggests a reduced hip fracture risk, especially in cases aged 80 or more, a different fracture pattern (lower percentage of medial fractures) and a reduced mortality at 9 months in patients treated with HMG-CoA reductase inhibitors, confirming the previous evidences reported in literature. Key words: statin, hip fractures, fracture risk, osteoporosis
Proximal Humerus Reconstruction after Tumor Resection: An Overview of Surgical Management
Get PDFProximal humerus is one of the anatomical sites that are most frequently involved by bone and soft tissue malignant tumors. Alone or in association with adjuvant treatments, surgery represents the main therapeutic option to treat and eradicate these diseases. Once the first-line option, in the last decades, amputation lost its role as treatment of choice for the large majority of cases in favor of the modern limb sparing surgery that promises to preserve anatomy and - as much as possible - upper limb functionality. Currently, the main approaches used to replace proximal humerus after a wide resection in oncologic surgery can be summarized in biological reconstructions (allograftsand autografts), prosthetic reconstructions (anatomic endoprostheses, total reverse shoulder prostheses), and graft-prosthetic composite reconstructions. The purpose of this overview is to present nowadays surgical options for proximal humerus reconstruction in oncological patients, with their respective advantages and disadvantages
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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