1,720,968 research outputs found
Double-Bundle Medial Patellofemoral Ligament Reconstruction With a Single Patellar Tunnel
No full textMedial patellofemoral ligament (MPFL) reconstruction is an established method to prevent patellofemoral instability. Nevertheless, the anatomy and the biomechanical behavior of native MPFL are still under investigation, but in recent years they have become more defined. We propose a technique for MPFL reconstruction based on the results of recent anatomic studies regarding the patellar insertion of the MPFL. A double-bundle MPFL is reconstructed by use of the semitendinosus tendon passed through a single patellar tunnel, which crosses the patella from the midpoint of its medial border until its superolateral corner is reached. This method permits a strong patellar fixation, potentially reducing the risk of patellar fracture compared with double-patellar tunnel techniques. Moreover, it requires no fixation devices at the patella and only a single interference screw on the femoral side. © 2013 Arthroscopy Association of North America
Supraspinatus rupture at the musculotendinous junction in a young woman
No full textThe vast majority of rotator cuff tears occur within the tendon or as an avulsion from the greater tuberosity. Supraspinatus injury at the musculotendinous junction is a very uncommon event. We describe a case of supraspinatus rupture at the musculotendinous junction, with successful conservative treatment. It occurred in a 23-year-old woman, the youngest patient with this uncommon type of injury. To our knowledge, this is the first case of rupture of the supraspinatus muscle at the musculotendinous junction in a young woman and the second in a woman
Lateral ankle instability in high-demand athletes: reconstruction with fibular periosteal flap
No full textPurpose: Fibular periosteal flaps have been used to address chronic lateral ankle instability, but there are no studies in the literature reporting functional outcomes after this particular procedure in high-demand athletes. We postulated that for chronic instability, nonanatomical reconstruction of the lateral ankle ligament with a fibular periosteal flap will return high-demand athletes to their previous levels of activity. Methods: Forty patients who had grade III ankle sprain and experienced no success after a course of supervised conservative management lasting at least six months and who had a preinjury Tegner score of ≥6 underwent a lateral compartment reconstruction with a fibular periosteal flap. Each patient was given the Tegner and Karlsson questionnaire and was evaluated by the Zwipp method, Foot and Ankle Outcome Score (FAOS) and the American Orthopaedic Foot and Ankle Society (AOFAS) score at the six-month, one, two and three-year time points. Range of motion (ROM) of the affected ankle was assessed, and stress X-rays were performed. Mean patient age was 24.5 (range17-30) years, and no patient was lost to follow-up. Results: Mean follow-up was 36 (minimum 18) months, mean Tegner scores at the one, two and three-year time points were 8.8, 8.9 and 8.9, respectively, and mean Karlsson scores were 93 ± 5.2, 95 ± 3.1 and 94.9, respectively. AOFAS and FAOS scores improved from a mean of 69.4 and 71.4, respectively, in the preoperative group to a mean of 97.2 and 94.4, respectively, at the last follow-up. The ROM was equal to the contralateral ankle in all but two patients at the two-year follow-up. No major complications were found. Conclusion: Nonanatomical ligament reconstruction with a fibular periosteal flap for chronic lateral ankle instability was effective in returning high-demand athletes to their preinjury functional levels
Surgical management of chronic proximal hamstring tendinopathy in athletes: a 2 to 11 years of follow-up
No full textAbstract: BACKGROUND: Proximal hamstring tendinopathy typically afflicts athletes. The poor knowledge of this pathology can lead to late diagnosis and late treatment, which in chronic cases could be challenging. Surgical treatment could resolve the symptoms and could permit the return to full sport activity also in chronic cases.
MATERIALS AND METHODS: We retrospectively evaluated 17 high-level athletes surgically treated for proximal hamstring tendinopathy. Symptoms lasted for an average of 23months and were resistive to conservative treatment.
RESULTS: The follow-up period averaged 71months. Return to run without pain occurred at a mean of 2.4months (range 1-4) after surgery. All patients returned to sports at their pre-symptom level at a mean of 4.4months after surgery. Results were excellent in 15 patients (88%) and good in two patients (12%). No results were fair or poor.
CONCLUSIONS: Surgical treatment to manage chronic proximal hamstring tendinopathy in high-level athletes showed excellent results in terms of relief from symptoms and return to previous sport level
Giant Intraosseous Schwannoma of the Ileopubic Ramus
No full textSchwannomas are the most common tumors of the peripheral nerves. Intraosseous schwannoma is a rare entity; approximately 200 cases are described in the world literature, with only 1 involving the ileopubic ramus. To the authors' knowledge, this article is the first to describe a giant intraosseous schwannoma of the ileopubic ramus, its clinical presentation and radiographic aspect, its histological findings, its biological behavior, and the differential diagnosis. It is also the first to describe surgical treatment of this entity. A 63-year-old woman presented with paroxysmal pain at the right groin. Radiographs showed a multilocular lytic lesion of the right ileopubic ramus, extending from the acetabulum to the pubic symphysis. Magnetic resonance imaging revealed extraosseous extension in the pelvis and in the anteromedial region of the right thigh. An incisional biopsy revealed fibroconnective tissue with sparse spindle cells in a myxoid stroma; diffuse expression of S100 protein was observed by immunohistochemistry. Intraosseous neurofibroma was the first histopathologic diagnosis. The 123834-cm lesion was entirely removed via a Letournel ileoinguinal approach. Reconstruction of the ileopubic ramus was performed with an autologous bone graft taken from the omolateral iliac crest and fixed by a pelvic reconstruction plate. Histopathological examination revealed Antoni A and B patterns with Verocay bodies, no mitosis or cellular atypia, and diffuse expression of S100 protein by immunohistochemistry, all features indicative of a benign schwannoma. The patient returned to activities of daily living with no limitations. No recurrence had occurred 24 months postoperatively
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
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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