The Journal of Bone and Joint Surgery. British volumeVol. 88-B, No. 2 AnnotationFree AccessThe international rank order of publications in major clinical orthopaedic journals from 2000 to 2004B. H. Bosker, C. C. P. M. VerheyenB. H. BoskerResearch FellowDepartment of Orthopaedic Surgery and Traumatology, Isala Clinics, Weezenlanden Hospital, P. O. Box 10500, 8000 GM Zwolle, The Netherlands.Search for more papers by this author, C. C. P. M. VerheyenConsultant Orthopaedic SurgeonDepartment of Orthopaedic Surgery and Traumatology, Isala Clinics, Weezenlanden Hospital, P. O. Box 10500, 8000 GM Zwolle, The Netherlands.Search for more papers by this authorPublished Online:1 Feb 2006https://doi.org/10.1302/0301-620X.88B2.17018AboutSectionsPDF/EPUB ToolsDownload CitationsTrack CitationsPermissionsAdd to Favourites ShareShare onFacebookTwitterLinked InRedditEmail Publications in peer-reviewed journals are the most important determinant by which research is rated and funding awarded. In this study, the publication rate in orthopaedic surgery of individual countries was scored in selected clinical journals in order to identify those which are making the principal contributions to the development of the orthopaedic discipline.A total of 15 major clinical orthopaedic journals was selected. All articles with abstracts were scored for the country of the corresponding author through a bibliometric search in Medline/PubMed over a period of five years (2000 to 2004). The total number of publications, the number adjusted for size of population and the impact factor of the journal were assessed for each country.A total of 13 311 articles were scored, of which 92% were generated by 15 countries with 47.4% by the United States, followed by Japan (8.0%) and the United Kingdom (7.3%). Corrected for population size, eight smaller European countries led this ranking with Sweden, Switzerland and Finland at the top, with the United States in their midst in sixth place. Japan and Finland scored the highest mean impact factor.This observational study demonstrates that the United States is the most productive country in absolute number of publications in the selected clinical orthopaedic journals, and when normalised for population size, the smaller European countries with a high proficiency in English were most successful.Our objective was to identify the countries which generate knowledge and progress in orthopaedic surgery and consider the factors that enabled them to be major contributors.MethodsThe major clinical orthopaedic journals were selected and ranked by the senior author (CCPMV) from the ‘orthopedics’ category of journals established by the Institute for Scientific Information as searched in April 2005.1 He chose to add the American Journal of Sports Medicine to that list. The 15 journals with the highest impact factor were chosen. The Medline/PubMed Journals Database2 was searched for these journals, and all articles with an abstract, as indicated in the ‘limits’ function in PubMed, were selected. The country of the corresponding author was used as the source nation for the article. Countries with fewer than 50 publications during the period tested were excluded. The mean impact factor for the period of review was calculated, as were the totals for each journal and country. For the calculation of publications per million inhabitants, the 2005 national population data were derived from the UN Population Information Network.3 The domestic expenditure on research as a percentage of the gross domestic product was taken as an indicator for the amount of national research funding.ResultsThere was a total of 13 311 articles with abstracts in the 15 chosen journals during the period of the review. All the selected journals were in English, 11 from the United States and four from Europe. The figures for the top 15 journals and countries are shown in Table I, in which the ranking order is determined by impact factor for the journals and by the total number of publications for the countries. The 15 countries listed account for 92% of the total number of articles, the first five countries for 71.9% and the United States by itself for 47.4%. The contribution from the United States was the highest in Orthopedic Clinics of North America (89.5%) and the American volume of the Journal of Bone and Joint Surgery (69.1%). The United Kingdom was responsible for 7.3% of the total scored articles. Its share in the British volume of the Journal of Bone and Joint Surgery was 37.7% of the 974 publications. Of these 367 articles, England had the highest share with 324 (88.2%), followed by Scotland with 38 (10.4%), Northern Ireland with four and Wales with one. Sweden scored 23.6% of the papers in the Acta Orthopedica Scandinavica, now Acta Orthopaedica. Table II ranks the publications per million inhabitants and establishes the position of each country. The data for domestic expenditure on research are listed as a percentage of the gross domestic product and are from 2002 or the last available year.4–6DiscussionThe United States has traditionally led the rankings in the output of publications in each of the 20 fields of science defined by the Institute for Scientific Information, and consequently also in clinical medicine overall.1 It is therefore not surprising that the same country also tops the ranking for total publications in major clinical orthopaedic journals. In similar recent studies of high-ranked journals in other medical specialties, their mean percentage was 37 (24 to 48).7–14When corrected for the size of population, the smaller western European countries (ranks 1 to 5, 7, 8) outrank the others, with the United States in their midst. The sixth place of the United States with clinical orthopaedic papers is substantially higher than their rank of 13 in the comparable list of publications in clinical medicine (1992 to 2002).15Some major western European countries perform rather poorly. France, Italy, Spain and Germany are low in lists normalised for population size in both clinical medicine and orthopaedics, as is Japan. Germany has some fine orthopaedic journals published in the native language such as Zeitschrift für Orthopädie und ihre Grenzgebiete, Der Unfallchirurg and Der Orthopäde with impact factors of approximately 0.50, but not sufficient to qualify for selection in the present study.We chose 15 major clinical orthopaedic journals since a broader selection would include a larger number of articles which will never be cited and therefore lack scientific impact. Narrowing the selection enhances the scientific quality of the selected papers but this disqualifies mainstream contributions. Many important contributions to orthopaedics are in publications which are not specific to orthopaedics and may be ranked higher than any journal in our list.The number of citations in top journals might be a more sensitive marker of scientific impact than the impact factor and the number of publications. However, it is hard to assess, and there is also a potential selection bias. We, therefore, decided to use the mean impact factor as an autonomous indicator of the prestige of a journal. Its limitations are acknowledged when used to compare large series but it has become an influential tool within the scientific world to evaluate research and award funding.16We originally planned to relate the total of clinical orthopaedic publications to the number of orthopaedic surgeons practising in a country, but it was not possible to construct such a list. It could also be argued that the number of scientists working in musculoskeletal research should also be included.The editorial process differs in the selected journals. Peer-reviewed journals such as both the American and British volumes of the Journal of Bone and Joint Surgery and Acta Orthopaedica are treated identically to those such as Clinical Orthopaedics and Related Research and Orthopedic Clinics of North America which have a relatively large number of invited manuscripts.It may be suggested that our findings are merely a reflection of the preference of editorial boards to select manuscripts written in proper English. Apart from the evident factor of size of population, national funding capacity and proficiency in English may also be important factors in the ranking.17The gross domestic expenditure on research as a percentage of gross domestic product was used as a determinant for the national funding capacity. Norway, Denmark, The Netherlands and Austria do well in clinical orthopaedic publications corrected for population size with relatively modest research funding, particularly when contrasted with Israel, Japan, Germany, Taiwan, South Korea and France. This finding contradicts the study from Man et al,17 who stated that publication output in major medical journals is linked to research funding at a national level. Their paper also suggested that proficiency in English may be an important determinant for publication in English-language medical journals. It is remarkable that five European countries where English is not the native language outrank all five where it is. The poor proficiency in English of the Mediterranean countries, as well as Japan, may partly explain their lower scores in publications corrected for population size.We are aware of only one other article that focuses on the ranking of countries with respect to publications in orthopaedic literature (1991 to 2001) which, in particular analysed the share of Japan.18 The selection of journals and articles was different from ours in that the top seven orthopaedic journals from the Institute for Scientific Information list were picked and it was not limited to articles with an abstract on Medline/PubMed. It therefore included editorials, letters to the editor and case reports. It focused on total production only, not taking population size into account.The conclusions from our study cannot be strict or definitive. However, it is obvious that, as in all other fields of science, the United States is the most productive country in terms of absolute number of publications (47.4%) in the selected clinical orthopaedic journals. When corrected for population size, the smaller European countries with a high proficiency in the English language were most successful.Table I. Top 15 countries ranked according to total of publications in clinical orthopedic journals (2000 to 2004)15 countries*IF†meanPublications totalUSJPUKGECASENLCHTRKOAUFRITFIAT* US, United States; JP, Japan; UK, United Kingdom; GE, Germany; CA, Canada; SE, Sweden; NL, Netherlands; CH, Switzerland; TR, Turkey; KO, South Korea; AU, Australia; FR, France; IT, Italy; FI, Finland; AT, Austria† mean impact factor between 2000 and 2004Spine2.20240910493371249714458812357485852255515Am J Sports Med2.1871344342173614241320-42348223J Bone Joint Surg [Am]2.061040719423224551015213199189810Arthroscopy1.5110124721094064211314133164101640520J Bone Joint Surg [Br]1.479747311936755293130351030342913627Eur Spine J1.30537572146803247514223492613127Clin Orthop1.262188140816451818028314514391934271333Knee Surg Sp Tr Arthrosc1.114074221316543413176251283064Orthop Clin North Am1.01257230-1281----7----Acta Orthop Scand1.0048321382247411434111277682410J Arthroplasty0.971019523681272164302020215231114613J Shoulder Elbow Surg0.93435206432925147618212117564J Orthop Trauma0.93541306242331326921141113322J Pediatric Orthop0.756453811933634-4323231916773Foot Ankle Int0.6665138523313413411182810271175Total publications (Ranking)133116315 (1)1070 (2)974 (3)668 (4)548 (5)407 (6)332 (7)307 (8)281 (9)280 (10)279 (11)241 (12)213 (13)179 (14)156 (15)Publ/10E6 inhabitants (Ranking)21.2 (6)8.4 (16)16.2 (11)8.1 (17)17.0 (9)45.0 (1)20.4 (7)41.3 (2)3.8 (21)5.9 (19)13.8 (13)4.0 (20)3.7 (22)34.1 (3)19.0 (8)Table II. Country ranking according to publications, impact factor and research spendingCountryPublications/10E6 (Ranking)Total publications (Ranking)Mean impact factor (Ranking)Research spending (% GDP*) (Ranking)* GDP, gross domestic productSweden45.0 (1)407 (6)1.36 (17)4.27 (2)Switzerland41.3 (2)307 (8)1.35 (18)2.63 (7)Finland34.1 (3)179 (14)1.58 (1)3.40 (3)Norway23.6 (4)109 (20)1.54 (3)1.62 (16)Denmark21.7 (5)118 (18)1.33 (19)2.19 (11)United States21.2 (6)6315 (1)1.44 (9)2.82 (6)Netherlands20.4 (7)332 (7)1.49 (5)1.94 (13)Austria19.0 (8)156 (15)1.39 (13)1.34 (18)Canada17.0 (9)548 (5)1.50 (4)1.85 (15)Israel16.8 (10)113 (19)1.25 (22)4.90 (1)United Kingdom16.2 (11)974 (3)1.41 (11)1.90 (14)Ireland14.5 (12)60 (23)1.24 (23)1.17 (19)Australia13.8 (13)279 (11)1.42 (10)1.53 (17)Greece9.2 (14)102 (21)1.38 (14)0.67 (22)Belgium9.0 (15)94 (22)1.33 (20)1.96 (12)Japan8.4 (16)1070 (2)1.58 (1)3.09 (4)Germany8.1 (17)668 (4)1.40 (12)2.50 (8)Taiwan6.2 (18)142 (16)1.46 (7)2.45 (9)South Korea5.9 (19)280 (10)1.45 (8)2.96 (5)France4.0 (20)241 (12)1.48 (6)2.20 (10)Turkey3.8 (21)281 (9)1.31 (21)0.64 (23)Italy3.7 (22)213 (13)1.38 (15)1.07 (20)Spain2.9 (23)125 (17)1.36 (16)0.96 (21)References1 Institute for Scientific Information. http://www.isinet.com (accessed 17/03/05). 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