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Correction to: Surgical correction of double major adolescent idiopathic scoliosis
No full textUnfortunately, the affiliation of the author group has been incorrectly published in original version. The complete correct affiliation of all authors should read as follows
Correction to: Spino-pelvic balance and surgical treatment of L5-S1 isthmic spondylolisthesis
No full textUnfortunately, the affiliation of the author group has been incorrectly published in original version. The complete correct affiliation of all authors should read as follows
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
Spino-pelvic balance and surgical treatment of L5–S1 isthmic spondylolisthesis
No full textLearning objectives
• To explain the principles of spino-pelvic balance;
• To show the clinical appearance, physical examination
and indication for surgery in high-grade L5–S1 isthmic
spondylolisthesis;
• To learn anatomy and technique related to severe high
dysplastic isthmic spondylolisthesis;
• To explain technical tricks when performing a surgical
reduction and fusion of a high-grade and high dysplastic
isthmic spondylolisthesi
Preoperative valgus deformity has twice the risk of failure as compared to varus deformity after total knee arthroplasty
No full textPurpose: The aim of this study was to assess whether preoperative valgus or varus deformity affected survivorship after total knee arthroplasty (TKA) and to quantify the risk factors for implant failure in a registry-based population. Methods: The Emilia-Romagna Registry of Prosthetic Orthopedic Implants was examined regarding TKAs performed on patients with a preoperative diagnosis of valgus or varus deformity. Demographics, implant characteristic and survivorships were investigated and compared. A total of 2327 TKA procedures performed from 2000 to 2016 were included in the study. Six hundred and forty primary TKAs with a diagnosis of valgus deformity were evaluated with a median follow-up of 3.3 years; 1687 primary TKAs with a diagnosis of varus deformity were evaluated with a median follow-up of 2.5 years. Results: Bi-compartmental, cemented posterior stabilised fixed-bearing implants were preferred. For both diagnoses, the implant survivorship rate was greater than 98% in the first year. However, the survival curve of the TKAs implanted for valgus deformity showed a greater slope in the first 3 years as compared to the survival curve of those implanted for varus deformity. Valgus deformity had a 2.1-fold higher risk for revision as compared with varus deformity. Infection was a major cause of implant failure in TKAs for varus deformity, 9/24 (37.5%), while its incidence was lower for valgus deformity, 1/21 (4.8%). Conclusions: Preoperative valgus alignment showed a twofold risk of failure as compared to varus alignment after TKA. This should be considered in daily practice, and surgeons are called on to pay more attention when performing TKAs on such patients. Prospective randomised controlled trials are, therefore, necessary to better understand the role of preoperative coronal knee deformity in implant failure. Level of evidence: Prognostic study, level III
Wilhelm Schulthess, Pioneer in the Treatment of Spinal Deformities: The Testimony of the Rizzoli Orthopedic Institute
No full textThe manuscript describes the testimony of the Rizzoli Orthopedic Institute about Wilhelm Schulthess, a pioneer in the treatment of spinal deformities
Surgical correction of double major adolescent idiopathic scoliosis
No full textLearning objectives
• To explain basic principles of adolescent idiopathic scoliosis management.
• To show how to place pedicle screws in the thoracic and
lumbar spine in case of adolescent idiopathic scoliosis.
• To show how to properly bend rods in case of double
major scoliosis curve.
• To explain how to perform correction maneuvers by rotation and translation simultaneously on two rods.
• To explain how to perform en-bloc direct vertebral rotation
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