1,720,978 research outputs found
Effect of cup medialization on primary stability of press-fit acetabular cups
Full text linkBackground: Appropriate restoration of the native centre of rotation is of paramount importance in total hip arthroplasty. Reconstruction of the centre of rotation depends on reaming technique: conventional approaches require more cup medialization than anatomical preparations. To date, the influence of cup medialization on socket stability in cementless implants is still unknown. Methods: Ten cadaveric hemipelvises were sequentially reamed using anatomical technique (only subchondral bone removal with restoration of the native centre of rotation) and conventional preparation (reaming to the lamina and medializing the cup). A biomechanical test was performed on the reconstructions. Implant motions were measured with digital image correlation while a cyclic load of increasing magnitude was applied. Findings: No significant difference was measured between the two implantation techniques in terms of permanent cup migrations. The only significant difference was found for the cup inducible rotations, where the conventional technique was associated with larger rotations. Interpretation: Conventional reaming and cup medialization do not improve initial cup stability. Beyond the recently questioned concerns about medialization and hip biomechanics, this is another issue to bear in mind when reaming the acetabulum
Treatment of Osteochondritis Dissecans of the Talus in Skeletally Immature Population: A Critical Analysis of the Available Evidence
No full textJuvenile osteochondritis dissecans of the talus (JOCDT) is a subchondral bone alteration and a partially or completely detached osteochondral fragment, affecting skeletally immature patients. A review of the English literature on PubMed was conducted. Conservative treatment was applied in patients up to Berndt-Harty stage III. Surgical indications were conservative management failure and loose bodies. The most performed procedures were drilling, subchondral bone grafting, fragment fixation, or excision. High rate of clinical success were achieved, whereas radiographic results were much lower. None of the surgical options demonstrated to be superior. Future long-term qualitative studies focusing on chondral tissue restoration are needed.
LEVELS OF EVIDENCE:
Therapeutic, Level IV
Environmental commitment of large US publicly traded companies producing healthcare equipment: a cross-sectional comparative study
No full textThe environmental commitment of healthcare stakeholders is poorly described despite the sector pollution and the social needs of more sustainable behaviors. A cross-sectional study comparing the environment commitment of US publicly traded companies producing healthcare equipment (HE), healthcare companies (H), and large capitalization corporates (LC) was designed. Using a financial database, the 20 largest US publicly traded companies by market capitalization were selected for each cohort. The last available sustainability report was investigated, aiming to assess (1) the year and the method of dissemination of the last report; (2) the adhesion to environmental standards; (3) the presence of environmental policies, quantitative targets, and tracking; (4) the third-party evaluations about company environmental sustainability. HE companies published sustainability reports in time (p = 0.048), usually as standalone reports (p < 0.001). Half of HE companies adhered to standards, less than the control groups (p < 0.001). HE companies had an acceptable environmental policy, improving over the time and posing targets, similarly to control groups (p > 0.05). The number of companies reporting quantitative targets/tracking about carbon footprint, water, and renewable energy managements differed among the three cohorts (p = 0.013, p = 0.013, and p < 0.001, respectively), with HE cohort achieving the lowest rates (70%, 70%, and 50%, respectively). Carbon neutrality and all renewable energy statements were rare among HE companies (10% and 5% of companies, p < 0.007). In HE, CDP (The Carbon Disclosure Project) scores were lower than controls (p < 0.001). US publicly traded companies producing healthcare equipment demonstrated to be far less committed to environmental sustainability than healthcare companies and large capitalization corporates. Level of evidence: I
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
Tissue Bioengineering in the Treatment of Osteochondritis Dissecans of the Talus in Children with Open Physis: Preliminary Results
No full textVariations 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
Arthroscopic tendon release for iliopsoas impingement after primary total hip arthroplasty: a retrospective, consecutive series
No full textIntroduction: Aim of this study was to describe the clinical outcomes of 16 patients with iliopsoas (IP) impingement after primary total hip arthroplasty (THA), treated with an arthroscopic tendon release. Methods: 16 patients (11 females/5 males), with a mean age of 57.8 ± 11.1 years (age at THA: 54.4 ± 11 years) and a diagnosis of IP impingement after primary THA, were treated with the Wettstein tenotomy. Preoperatively, every patient underwent a diagnostic ultrasonography guided peritendinous injection and a computed tomography (CT) scan. Every patient was clinically evaluated using WOMAC score. Subjective pain relief and active hip flexion strength were measured. Results: No complications related to arthroscopy were detected. Every cup was prominent with a mean axial overhang of 13 ± 4.8 mm (range 5–20 mm). At a mean follow-up of 27 ± 20.1 months (range 6–48 months), the WOMAC score was 83.7 ± 10.1 points. 13 patients out of 16 (81.3%) had a complete pain relief. 14 patients out of 16 (88%) regained full active hip flexion strength at the final follow-up. 1 patient was scheduled for cup revision after 6 months, due to persistent symptomatology. No demographic data or CT measurements about cup position statistically influenced the outcome. Conclusions: When preceded by an appropriate diagnosis, arthroscopic tenotomy proved safe and effective for IP impingement, regardless the magnitude of cup protrusion
Ankle surgery: focus on arthroscopy
No full textBackground: The ankle joint can be affected by several diseases, with clinical presentation varying from mild pain or swelling to inability, becoming in some cases a serious problem in daily life activities. Arthroscopy is a widely performed procedure in orthopedic surgery, due to the low invasivity compared to the more traditional open field surgery. The ankle joint presents anatomical specificities, like small space and tangential view that make arthroscopy more difficult. Methods: From 2000 more than 600 ankle arthroscopies were performed at our institution. The treated pathologies were mostly impingement syndrome and osteochondral lesions, and in lower percentage instabilities and ankle fractures. Results: In the impingement, the AOFAS scores at FU showed an increase compared to scores collected preoperatively, with improvement of symptoms in most of the cases, good or excellent results in 80 % of cases. In ligament injuries, AOFAS score significatively improved at the maximum follow-up. In fractures all patients had an excellent AOFAS score at maximum follow-up, with complete return to their pre-injury activities. In osteochondral injuries, the clinical results showed a progressive improvement over time with the different performed procedures. Control MRI and bioptic samples showed a good regeneration of the cartilage and bone tissue in the lesion site. Conclusions: The encouraging obtained clinical results, in line with the literature, show how the arthroscopic technique, after an adequate learning curve, may represent a precious aid for the orthopedic surgeon and for the patient's outcome. Level of evidence: Case series, Level IV. © 2013 Istituto Ortopedico Rizzoli
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