1,720,955 research outputs found
Reperforming Minimally Invasive Microdiscectomy Approaches for Recurrent Lumbar Intervertebral Disc Prolapse
No full textBackground Data: Reperforming minimally invasive discectomy (MID) approaches are typically challenging and demanding for patients with recurrent lumbar disc herniation (rLDH).
Purpose: The aim of this study to assess the safety and efficacy of reperforming Minimally invasive discectomy in recurrent lumbar disc herniation surgery.
Study Design: Retrospective clinical case study.
Patients and Methods: The author reviewed the medical records all patients re-operated after MID during the period from June 2010 to April 2016 via minimally invasive approaches for recurrent lumbar disc herniation. Age, gender, presenting symptoms, disc herniation level and side, type of MID approach used in first surgery, period between 1st and 2nd surgeries, redo surgery duration, intra or post-operative complications, visual analogue scale VAS for pain at 1, 30, and 90 days postoperatively were recorded.
Results: We could track 18 patients (12 males, 6 females), with mean age 43.2±6.3 years. The most operated level was L4/5 in 12 patients. Disc herniation on the left side was presented in 11 patients. Mean duration between the two surgeries was 44±19 weeks. Main clinical presentations were recurrent leg pain in 16 patients and new onset of partial foot drop in 2 patients. Duration of redo surgery was 97±37 minutes. Intraoperative minor dural tears were reported in 2 with no serious sequels. VAS for leg pain improved from 7.3±1.2 preoperatively to 2.1±1.1, 1.4±0.5 and 1.2±0.4 at 1, 30 and 90 postoperative days respectively.
Conclusion: MID approach for rLDH following initial MID surgery sounds feasible option with better perioperative and short-term outcome. Clinical outcome in the present study showed favourable outcome regarding operative time and incidence of dural tears with CSF leak comparing to open approaches. (2017ESJ151
Instrumented Posterolateral Spinal Arthrodesis as an Effective Treatment for Single Level Symptomatic Vacuum Lumbar Disc Degeneration in Elderly Patients
No full textBackground Data: Lumbar intervertebral disc vacuum phenomenon is an advanced form of spinal destabilizing degenerative changes. It is common in the elderly population and can cause refractory low back pain.
Purpose: To evaluate the efficacy and safety of instrumented posterolateral fusion in treating symptomatic lumbar single level vacuum phenomenon in elderly population.
Study Design: Retrospective descriptive clinical case series.
Patients and Methods: Twenty-one patients (16 males & 5 females), aging more than 65 years, had all their files reviewed. They were operated by instrumented posterolateral fusion to treat chronic refractory low back pain due to single level intervertebral lumbar disc vacuum phenomenon. They underwent operation after failure of adequate 6 months conservative management. Age, gender, symptoms duration, spinal level affected, surgery duration, length of hospital stay, intra or post-operative complications, visual analogue scale VAS for pain, and Lenke’s graft fusion classification at 1, 3 & 6 months postoperatively were all recorded.
Results: The results of this study showed the most affected level was L4/L5, mean age was 73±7 years, mean symptoms duration was 11 years, mean surgery duration was 137±29 minutes, and mean VAS for preoperative-postoperative pain improvement was 5.9±1.2. Good fusion (Lenke’s grades A & B) was reported in 81% of patients. No major intra or postoperative complications.
Conclusion: Instrumented posterolateral fusion in elderly population patients with mono-segmental advanced disc degeneration may yield clinical outcome with low operative risk. (2017ESJ150
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
