The Most Frequently Cited 100 Articles in Liver Transplantation Literature

Introduction

We investigated the liver transplantation literature since 1975 and found the most frequently cited 100 articles and assessed the distribution of authors and journals of these articles.

Association of scientific and nonscientific factors to citation rates of articles of renowned orthopedic journals

Purpose

The physician often relies on the prestige of a journal to identify the most relevant articles to be read in his field. This investigation studied associations of scientific and nonscientific criteria with the citation frequency of articles in two top-ranked international orthopedic journals.

Methods

The 100 most (mean, 88 citations/5 years for cases) and 100 least (mean, two citations/5 years for controls) cited articles published between 2000 and 2004 in the Journal of Bone and Joint Surgery and the Bone & Joint Journal (formerly known as JBJS (Br)), two of the most distributed general orthopedic journals, were identified. The association of scientific and nonscientific factors on their citation rate was quantified.

Results

Randomized controlled trials, as well as multicenter studies with large sample sizes, were significantly more frequent in the high citation rate group. The unadjusted odds of a highly cited article to be supported by industry were 2.8 (95 % confidence interval 1.5, 5.6; p?<?0.05) if compared with a lowly cited article.

Conclusion

Beside scientific factors, nonscientific factors such as industrial support seem associated to the citation rate of published articles. This, together with publication bias, questions whether scientific facts reach the readers in a balanced fashion. Level of Evidence 3     

The fifty most cited Latin-American articles in the orthopaedic literature

Purpose

The number of citations of an article is a marker of its academic influence. Several medical specialties, including orthopaedics, have ranked the articles with more citations. We identified the 50 most cited orthopaedic articles from Latin-America and analyzed the characteristics that made them citable.

Methods

Science Citation Index Expanded was searched for citations of articles originated in Latin-America, published in any of the 63 journals in the category “Orthopaedics” from 1988 to 2013. We created a list ranking the 50 most commonly cited articles and determined the citation density (Citations/years since publication). Information noted for each article included authors, year of publication, country of origin, source journal, article type, and field of research.

Results

Latin-American countries were the origin of 1 % of orthopaedic articles. The top 50 most cited articles had between 29 and 150 citations (mean, 44.48); the citation density ranged from 1.43 to 15.5 citations/years (mean, 5.25). The articles were published in 19 of the 63 journals (11 general and eight sub-specialty journals), and all were published in English. Most articles (n = 29) were published in 2000 or later. The majority were clinical articles (n=40), and the most common fields were arthroscopy (n = 15) and hip surgery (n = 13). The top 50 articles originated mainly from Brazil (n = 20) and Argentina (n = 15).

Conclusions

This top 50 list displays articles that have become important references for the orthopaedic scientific community. Researchers may use this work to make their future publications more influential on future investigators.     

Worldwide research productivity in the field of spine surgery: a 10-year bibliometric analysis

Purpose

Bibliometrics is increasingly used to assess the quantity and quality of scientific research output in many research fields worldwide. However, the bibliometric studies in the field of spine surgery are scarce. This study aimed to evaluate the worldwide research productivity in the field of spine surgery using bibliometric methods and to provide an insight into the spine research for surgeons and researchers.

Methods

Articles published between 2004 and 2013 were retrieved using the Scopus database in 5 spine journals, including Spine, European Spine Journal, The Spine Journal, Journal of Neurosurgery: Spine, and Journal of Spinal Disorders and Techniques. The number of articles, trend of publications, countries’ contribution and h-index, authorship, subspecialty, funding source, journal pattern, institutions, and top cited articles were analyzed.

Results

A total of 13,115 publications were identified in the database of Scopus from 2004 to 2013. The time trend of the number of articles showed a significant increase of 1.9-fold between 2004 and 2013 (p = 0.000). The largest number of articles in the field of spine surgery was from United States (39.17 %), followed by Japan (10.74 %) and China (8.62 %). United States also have the highest h-index (106), followed by Canada (60) and United Kingdom (54). China (p = 0.000) and South Korea (p = 0.000) have a significantly increasing trend of contribution proportion to the world spine production over time in years, but h-index was still low (39 and 38, respectively). Spine published the highest number of articles (45.44 %), followed by European Spine Journal (21.43 %) and Journal of Neurosurgery: Spine (13.32 %). The most productive institutions were University of California, San Francisco (1.98 %), followed by Thomas Jefferson University (1.61 %) and University of Toronto (1.41 %).

Conclusions

There has a rapid increase of scientific research productivity in the field of spine surgery during the past 10 years. United States has special contributions to the body of spine publications. China and South Korea have increasing contributions to the field of spine surgery.

     

Altmetric Versus Bibliometric Perspective Regarding Publication Impact and Force

Background

Bibliometric and Altmetric analyses highlight key publications, which have been considered to be the most influential in their field. The hypothesis was that highly cited articles would correlate positively with levels of evidence and Altmetric scores (AS) and rank.

Methods

Surgery as a search term was entered into Thomson Reuter’s Web of Science database to identify all English-language full articles. The 100 most cited articles were analysed by topic, journal, author, year, institution, and AS.

Results

By bibliometric criteria, eligible articles numbered 286,122 and the median (range) citation number was 574 (446–5746). The most cited article (Dindo et al.) classified surgical complications by severity score (5746 citations). Annals of Surgery published most articles and received most citations (26,457). The country and year with most publications were the USA (n?=?50) and 1999 (n?=?11). By Altmetric criteria, the article with the highest AS was by Bigelow et al. (AS?=?53, hypothermia’s role in cardiac surgery); Annals of Surgery published most articles, and the country and year with most publications were USA (n?=?4) and 2007 (n?=?3). Level-1-evidence articles numbered 13, but no correlation was found between evidence level and citation number (SCC 0.094, p?=?0.352) or AS (SCC?=?0.149, p?=?0.244). Median AS was 0 (0–53), and in articles published after the year 2000, AS was associated with citation number (r?=?0.461, p?=?0.001) and citation rate index (r?=?0.455, p?=?0.002). AS was not associated with journal impact factor (r?=?0.160, p?=?0.118).

Conclusion

Bibliometric and Altmetric analyses provide important but different perspectives regarding article impact, which are unrelated to evidence level.

     

Classic papers on pelvic floor physiotherapy: the most frequently cited articles in three decades (1983–2013)

Introduction and hypothesis

Pelvic floor physiotherapy has been utilized extensively over the past decades for the treatment of pelvic floor dysfunctions. The aim of this study was to identify and characterize the most frequently cited articles on pelvic floor physiotherapy published in the last 30 years.

Methods

A PubMed search of all articles published between 1983 and 2013 was performed. Articles with more than 100 citations were identified as “classic,” and were further analyzed based on author names, year of publication, journal of publication, subject, study design, country of research, and number of citations. In 2017, a new search for papers on pelvic floor physiotherapy was conducted using the same methods to compare them with the 2013 data.

Results

Of 1,285 articles published between 1983 and 2013, only 20 articles were cited more than 100 times. Among them, we found 12 randomized clinical trials (RCTs) and only 4 reviews. The most common topics among the classic articles were behavior therapy, pelvic floor muscle training (PFMT), biofeedback-assisted PFMT, and neuromuscular electrical stimulation. In 2017, we found 1,745 papers containing the term “pelvic floor physiotherapy,” indicating an increase of around 35% in 4 years.

Conclusions

Although there is a fast-growing number of publications, we still have few classic papers on pelvic floor physiotherapy, concentrated in a few research centers. However, the large number of RCTs shows that these papers have a high scientific level, confirming that they can be classified as classic papers.

     

Assessing the evolution of publications by Brazilian spine surgeons in the last decade

Purpose

To evaluate the scientific contribution of Brazilian Spine Surgeons not only in number of publications but also in their quality between January 2000 to December 2011.

Methods

A literature search of publications by Brazilian spinal surgeons on topics concerning the spine or spinal cord was performed using an online database; Pubmed.gov. The results were limited to articles published from January 2000 to December 2011. A total of 1,778 articles were identified after a Medline search. After exclusion criteria, the study comprised 206 articles. The quality of the Journals was assessed with IF and the article quality using the Oxford classification.

Results

An increasing number of publications by Brazilian spine surgeons was observed in recent years: 45.1 % of those papers were published during the last 4 years (2008–2011). Clinical studies and case reports were the most frequent types of article published (37.5 vs 31.1 %). An increasing number of Brazilian publications in non-Brazilian journals has been observed in recent years (linear-by-linear association: 5.449, P = 0.020). The Arquivos de Neuro-Psiquiatria was the most frequent journal in which the papers were published (N = 67, 32 %). The IF of the publications varied from 0.021 to 8.017. The analysis of quality of the articles using the Oxford classification demonstrated that most of them provided LOE 4 (N = 113, 54.9 %) or 5 (N = 45, 21.8 %).

Conclusions

There have been an increasing number of publications by Brazilian spine surgeons in recent years and the quality of the articles published has improved. Also the number of publications by Brazilians in non-Brazilian journals has increased in recent years.     

Publikationsleistungen der Universitätskliniken für Anästhesiologie

Aim

This study assessed the publication performance of university departments of anesthesiology in Austria, Germany and Switzerland. The number of publications, original articles, impact factors and citations were evaluated.

Material and methods

A search was performed in PubMed to identify publications related to anesthesiology from 2001 to 2010. All articles from anesthesiology journals listed in the fields of anesthesia/pain therapy, critical care and emergency medicine by the “journal citation report 2013” in Thomson Reuters ISI web of knowledge were included. Articles from non-anaesthesiology journals, where the stem of the word anesthesia (anes*, anaes*, anäst*, anast*) appears in the affiliation field of PubMed, were included as well. The time periods 2001–2005 and 2006–2010 were compared. Articles were allocated to university departments in Austria, Germany and Switzerland via the affiliation field.

Results

A total of 45 university departments in Austria, Germany and Switzerland and 125,979 publications from 2,863 journals (65 anesthesiology journals, 2,798 non-anesthesiology journals) were analyzed. Of the publications 23?% could not be allocated to a given university department of anesthesiology. In the observation period the university department of anesthesiology in Berlin achieved most publications (n?=?479) and impact points (1,384), whereas Vienna accumulated most original articles (n?=?156). Austria had the most publications per million inhabitants in 2006-2010 (n=50) followed by Switzerland (n=49) and Germany (n=35). The number of publications during the observation period decreased in Germany (0.5?%), Austria (7?%) and Switzerland (8?%). Tables 2 and 4–8 of this article are available at Springer Link under Supplemental.

Conclusions

The research performance varied among the university departments of anesthesiology in Germany, Austria and Switzerland whereby larger university departments, such as Berlin or Vienna published most. Publication output in Germany, Austria and Switzerland has decreased. Data processing in PubMed should be improved.     

Los top 100. Revisión de los artículos más citados en cirugía

Introduction

We performed a study of the top 100 most cited articles in the five general surgery journals with the highest impact according to Journal Citation Report.

High-impact articles in hand surgery

Background

There have been few attempts to identify classic papers within the hand surgery literature. This study used citation analysis to identify and characterize the top 50 highly cited hand surgery articles published in six peer-reviewed journals.

Methods

The 50 most highly cited hand surgery articles were identified in the Journal of Bone and Joint Surgery (JBJS) American, JBJS British, Plastic and Reconstructive Surgery, Journal of Hand Surgery (JHS) American, JHS British/European, and Hand. Articles were evaluated for citations per year, surgical/anatomical topic, and type of study. Clinical studies were further sub-categorized by level of evidence. The distribution of topics was compared with all indexed hand surgery articles. The educational relevance was assessed via comparison with lists of “classic” papers.

Results

The most common subjects were distal radius fracture, carpal tunnel syndrome, and flexor tendon repair. There was moderate correlation between the distribution of these topics and all indexed hand surgery articles (rho = 0.71). There were 31 clinical studies, of which 16 were therapeutic, ten were prognostic, and five were diagnostic. These articles assessed the outcomes of an intervention, described an anatomical/functional observation, introduced an innovation, presented a discovery/classification, or validated a questionnaire. There were only three randomized trials. Using citations per year to control for the influence of time since publication, 36 articles were consistently highly cited. Twenty-three articles were on Stern’s Selected Readings in Hand Surgery, considered important in education.

Conclusions

The top 50 highly cited articles in hand surgery reflect the most common clinical, scientific, and educational efforts of the field.     

A systematic review of spinal research conducted using the National Surgical Quality Improvement Program

Background Context

Over the course of the last decade, interest in the use of large data repositories for clinical research in orthopedic and spine surgery has grown substantially. Detractors maintain that the clinical relevance of research conducted using large registries is limited, and that the academic influence of such studies is minimal. Such contentions have not been empirically evaluated.

The top 100 cited articles in urology

Background

We identified and analyzed the characteristics of the 100 most frequently cited articles published between 1965 and 2007 in journals pertaining to urology and related fields.

Methods

We selected 69 of the highest impact urology and sub-specialty journals and 22 of the highest impact general medical and medical research journals from the 2006 edition of Journal Citation Reports: Science edition. We identified the 100 most frequently cited urological articles published in these 91 journals using the Science Citation Index Expanded (1965–present). We reviewed and analyzed the articles.

Results

The top 100 articles were cited a mean of 629 times (range 418–1435) and published between 1965 and 2003, with 89% published after 1979 and 54% published in the 1990s. Fifteen journals were represented, led by The New England Journal of Medicine (30), The Journal of Urology (22) and Lancet (11). Ninety publications originated from North America (81) or the United Kingdom (9). Johns Hopkins University (13), Harvard University (5), Stanford University (5) and University of California, Los Angeles (5) published the most articles. Five urologists were first authors of 2 or more of the articles. Fifty-six articles reported observational studies. Oncology (51) and transplantation (20) were the most commonly represented urological subfields.

Conclusion

These top-cited articles in urology identify topics and authors that contributed to major advances in urology. Observational studies and randomized controlled trials in oncology published in high-impact urological or medical journals constitute the most common type of highly cited publications.     

Authorship,institutional and citation metrics for publications on postmenopausal osteoporosis

Introduction

Osteoporosis is the most common metabolic bone condition that does not often become clinically clear until a fracture occurs. The objective of the current study was to analyze all publications whose titles included the term “postmenopausal osteoporosis” published during the past decade by journals indexed in the database of SCI-E.

Methods

This paper analyzes two sets of data: in the first, all papers with “postmenopausal osteoporosis” in their titles indexed in the database of SCI-E in the period 2001-2011; the second, all papers published by Osteoporosis International that were indexed in SCI-E during 2001-2011. The Science of Science Tool was used to map the co-authorship networks of papers published by Osteoporosis International in 2007-2011. Only papers cited more than 100 times in the Web of Science were considered for mapping the co-authorship network.

Results

A total number of 2,056 papers with “postmenopausal osteoporosis” in their titles were indexed in SCI-E between 2001 and 2011. The annual number of publications increased during the study period. The majority of publications came from Western Europe and North America. The number of papers published by authors based in Western Europe was about 75% greater than for North America.

Conclusion

More papers on postmenopausal osteoporosis were published in Western Europe than in North America. The networks of co-authorship pointed to the strategic positions of highly cited authors from Western Europe. The top eight authors contributing the majority of papers were from Western Europe. Consequently Western Europe had greater impact than North America.     

Worldwide arthroplasty research productivity and contribution of Turkey

Purpose

Bibliometrics is increasingly used to assess the quantity and quality of scientific research output in many research fields worldwide. However, to the best of our knowledge, no studies have documented the main characteristics of arthroplasty publications from different countries. This study aimed to evaluate the worldwide research productivity and status of Turkey in the field of arthroplasty using bibliometric methods and to provide an insight into the arthroplasty research for surgeons and researchers.

Basic Science Research Trends in Orthopedic Surgery: An Analysis of the Top 100 Cited Articles

Background

Much of current clinical orthopedics traces its origin to basic science investigation of cellular and biochemical pathways, tissue engineering, and biomechanics of bone and joint physiology in animal and cadaveric models.

Questions/Purposes

We sought to describe research trends in highly cited basic science studies in orthopedics.

Methods

By searching Web of Science, we identified the 100 most cited basic science orthopedics articles and focused on author position and degree (PhD, MD, or MD/PhD), topic, type of study, country, institution, and citation trends.

Results

These articles were published from 1970 to 2008 (citation range, 330 to 2111), with the majority from the USA (78). While there was no correlation between years since publication and total citations, more recent articles had higher citation rates. There were 38 unique first authors represented, with Caplan, Harris, Mankin, Noyes, and Warren as primary authors or co-authors of four articles each. Twelve journals published these 100 articles, with the majority in Journal of Bone and Joint Surgery (46) and Clinical Orthopaedics and Related Research (18). Frequent topics included biomechanics (31), healing/regeneration (21), and cellular/molecular biology (13). The Hospital for Special Surgery/Cornell University (10) published the most, followed by the Hospital for Joint Diseases/New York University (6), and University of Pittsburgh (6). No difference was observed in total citations and average citation rate by author degree. Eight articles were contributed from privately owned institutions or industry, with the rest from academic hospitals.

Conclusion

This review may aid those seeking insight into landmark studies and future direction of basic science research in orthopedics.

     

Bibliometric Analysis of the Top-Cited Articles on Unicompartmental Knee Arthroplasty

BackgroundUnicompartmental knee arthroplasty (UKA) has been proven to be an effective surgical technique for unilateral compartment osteoarthritis. The purpose of this study is to identify and analyze the top 100 cited articles in the field of UKA research.MethodsPublications on UKA from 1980 to 2020 in the Web of Science database were retrieved. The characteristics of the top 100 cited articles were analyzed, including information of publications and citations, level of evidence, and research interests.ResultsThe number of publications and citations increased over time. The majority of the highly cited articles were from the Nuffield Orthopedic Centre (Oxford, England) and the Brigham and Women’s Hospital (Boston, USA). Long-term outcome of UKA and comparison between UKA and TKA gathered most research interests. The most frequently occurring keywords were “survival” and “revision.” Since 2012, “life quality” and “robotics” have been used. There was no level I evidence, and most studies provided level IV evidence.ConclusionThere was a rising trend in publications and citations in the field of UKA research, the majority of them were from a few centers, and were low-level evidence. Most studies focused on the long-term outcomes of UKA; in recent years, patient satisfaction and navigation surgery have become new research trends.     

Changes in the Number of Resident Publications after Inception of the 80-hour Work Week

Background

Since the inception of resident work-hour regulations, there has been considerable concern regarding the influence of decreased work hours on graduate medical education. In particular, it is unclear whether implementation of work-hour restrictions has influenced resident academic performance as defined by quantity of peer-reviewed publications while participating in graduate medical education.

Questions/purposes

We determined the impact of work-hour changes on resident involvement in the number of published clinical studies, laboratory research, case reports, and review articles.

Methods

We conducted a PubMed literature search of 139 consecutive orthopaedic surgery residents (789 total resident-years) at one institution from academic years 1995–1996 to 2008–2009. This represented a continuous timeline before and after implementation of work-hour restrictions. The number of resident publications before and after implementation of work-hour changes was compared.

Results

There was a greater probability of peer review authorship in any given resident-year after work-hour changes than before. Average publications per resident-year increased for total articles, clinical articles, case reports, and reviews. There was an increased rate of publications in which the resident was the first author.

Conclusions

Since implementation of work-hour changes, total resident publications and publications per resident-year have increased.     

Endotrachealtuben bei Kindern

Background

Estimating the endotracheal tube size with the optimal internal diameter (ID) is of outstanding importance for airway management in pediatric patients. For many years different weight, height, and/or age-based formulas have been published. The aim of the present study was to identify and to compare published formulas to estimate optimal tube size in pediatric patients.

Materials and methods

A PubMed search was performed to identify published formulas for tube diameter in pediatric patients. The keywords ??pediatric?? or ??paediatric??, ??anesthesia?? or ??anaesthesia??, ??anaesthesiology?? or ??anesthesiology??, ??size??, ??formula??, ??diameter??, ??tube?? or ??endotracheal tube?? were used. Analysis was limited to articles published between 01.01.1951 and 30.06.2009. Additionally, similar publications retrieved from PubMed (related articles) and cited references were identified. Publications and formulas were assessed and classified by two independent colleagues.

Results

In the specified time-frame, 13 publications (11 original contributions and 2 letters to the editor) were identified with PubMed and 3 more formulas with the extended search. Altogether 22 formulas to estimate appropriate endotracheal tube size for pediatric patients (age 0?C18 years) were identified: 12 age-based formulas for tubes without a cuff, 4 height-based formulas for tubes without a cuff, 2 weight-based formulas for tubes without a cuff and one multivariate formula for tubes without a cuff as well as 3 age-based formulas for cuffed endotracheal tubes.

Conclusions

The identified formulas were comparatively simple to apply but were validated only for pediatric patients older than 1 year. Using tubes with a cuff can minimize the problem of optimal tube size. If a tube without a cuff is intended to be used other sizes should also be available.     

Von Bergmann, Kocher, and Krönlein—a triumvirate of pioneers with a common neurosurgical concept

Background

The rise of a neurosurgical subspecialisation in general surgery was strongly influenced by some key surgeons. In the German-speaking regions of Europe, Ernst von Bergmann, Emil Theodor Kocher and Rudolf Ulrich Krönlein have to be especially highlighted.

Methods

This article describes their contributions to the neurosurgical field and their personal interactions. For this, the numerous publications on cranial neurosurgery of von Bergmann were reviewed. They are presented in chronological order. Kocher’s and Krönlein’s contributions to early neurosurgery have been valued recently by the authors and are briefly summarized.

Results

All three developed early interest in the neurosurgical field and conducted clinical and experimental research at the turn of the twentieth century. It becomes evident that von Bergmann, Kocher and Krönlein provided a basis for a transnational neurosurgical school.

Conclusion

This triumvirate developed a common neurosurgical concept that was grounded in the physiological experiments and scientific evidence.     

The 50 Most-cited Articles in Orthopaedic Surgery From Mainland China

Background

Citation analysis has been widely used to evaluate the impact of articles in medical and surgical specialties. Although China is the most populous country in the world, and although more than 50,000 orthopaedic surgeons practice there, to our knowledge no formal citation analysis of Chinese orthopaedic articles has been performed.

Questions/purposes

We identified the 50 most-cited orthopaedic articles from mainland China and evaluated these articles in terms of their language of publication, source journals, and topics.

Methods

Science Citation Index Expanded was searched in July 31, 2014 for citations of articles published in 70 selected journals since the inception of the database. The 50 most-cited orthopaedic articles originating in mainland China were identified. Basic information, including title, authors, year of publication, article type, journal in which the work was published, city, institution, number of citations, decade published, and topic or subspecialty of the research were recorded.

Results

The number of citations for the top 50 papers ranged from 181 to 31 (mean, 52). These articles were published between 1981 and 2010. The decade of 2000 to 2009 was the most prolific, with 36 of the top 50 articles published during this time. All articles were written in English and they were published in a total of 16 journals. The journal Spine published the largest number of articles (12), followed by Clinical Orthopaedics and Related Research^® (seven). The journal Lancet had the highest impact factor (39.207 for 2013) among any of the journals that published articles we identified. The top 50 articles originated mainly from Beijing (16) and Shanghai (12), with basic research being the focus of the majority (27 of 50; 54%); the remaining were clinical studies. Bone was the most-investigated topic in basic research; the spine was the most-common topic among the identified clinical studies.

Conclusions

The 50 most-cited articles that we identified should be considered influential, although a large gap remains between mainland China and the global orthopaedic community in terms of citations per article. Nevertheless, insofar as the most-recent decade of our survey generated the most articles in this top-50 list, we would characterize mainland China’s effect on musculoskeletal research as increasing, and as funding increases to programs in mainland China, we anticipate this trend will continue in the future.