Orthopedics

Feature Article 

Bibliometric Analysis of the Orthopedic Literature

Zhaoyang Hui, MD; Zhongmei Yi, MD; Jun Peng, PhD

Abstract

Bibliometric indicators are used to assess research performance. The goal of this study was to explore publication output to construct a picture of orthopedics that may be beneficial to researchers and orthopedic specialists. All orthopedics articles published in 61 journals from 2000 to 2011 were retrieved from the Science Citation Index Expanded database. The numbers of articles, citations, authors, institutions, and journals were analyzed and subjected to quantitative and qualitative comparisons. The number of published orthopedics articles increased between 2000 and 2011. Articles published by authors from the United States always ranked first in number, although the United States’ share is decreasing in the world literature. Authors from the United States published the most-cited articles and the most articles in journals with top-10 impact factors; moreover, the United States also had the greatest share of experts and highly ranked institutions. The United Kingdom, Germany, and Japan were always within the world’s top 4 in terms of numbers of articles and citations. The shares of Germany, South Korea, and China among total orthopedics articles increased, especially that of China. In 2011, China ranked the fifth in the world, with its world share increasing from 0.64% in 2000 to 5.05% in 2011. However, China lags behind in average citations per article, top research institutions, and most prolific authors. According to the total citations per article, the University of Pittsburgh, Harvard University, and the Hospital for Special Surgery were the most prolific institutions.

The authors are from the Library of the Second Military Medical University, Shanghai, China.

The authors have no relevant financial relationships to disclose.

The Library of the Second Military Medical University provided research support for this study.

Drs Hui and Yi contributed equally to this article.

The authors acknowledge the valuable cooperation of Ellen Detlefsen in preparing this article.

Correspondence should be addressed to: Jun Peng, PhD, Library of the Second Military Medical University, No. 800 Xiangyin Rd, Shanghai 200433, China (pengjun@smmu.edu.cn).

Abstract

Bibliometric indicators are used to assess research performance. The goal of this study was to explore publication output to construct a picture of orthopedics that may be beneficial to researchers and orthopedic specialists. All orthopedics articles published in 61 journals from 2000 to 2011 were retrieved from the Science Citation Index Expanded database. The numbers of articles, citations, authors, institutions, and journals were analyzed and subjected to quantitative and qualitative comparisons. The number of published orthopedics articles increased between 2000 and 2011. Articles published by authors from the United States always ranked first in number, although the United States’ share is decreasing in the world literature. Authors from the United States published the most-cited articles and the most articles in journals with top-10 impact factors; moreover, the United States also had the greatest share of experts and highly ranked institutions. The United Kingdom, Germany, and Japan were always within the world’s top 4 in terms of numbers of articles and citations. The shares of Germany, South Korea, and China among total orthopedics articles increased, especially that of China. In 2011, China ranked the fifth in the world, with its world share increasing from 0.64% in 2000 to 5.05% in 2011. However, China lags behind in average citations per article, top research institutions, and most prolific authors. According to the total citations per article, the University of Pittsburgh, Harvard University, and the Hospital for Special Surgery were the most prolific institutions.

The authors are from the Library of the Second Military Medical University, Shanghai, China.

The authors have no relevant financial relationships to disclose.

The Library of the Second Military Medical University provided research support for this study.

Drs Hui and Yi contributed equally to this article.

The authors acknowledge the valuable cooperation of Ellen Detlefsen in preparing this article.

Correspondence should be addressed to: Jun Peng, PhD, Library of the Second Military Medical University, No. 800 Xiangyin Rd, Shanghai 200433, China (pengjun@smmu.edu.cn).

The quantity and quality of scientific literature are measurements of scientific achievement. The contents and quantity of scientific literature can be used to analyze the history and current status of science and technology and to forecast trends. Bibliometric techniques are a useful tool for appraising research output quality.1 The purpose of the current study was to evaluate scientific productivity in orthopedics research using bibliometric methods to provide a general picture of orthopedic research for researchers and clinicians. The study used data from Journal Citation Reports 2010, published by the Institute for Scientific Information since 1975 and considered the most comprehensive citation index of scientific literature, with coverage of 8288 journals in 2011.2 Citation analyses and the calculation of a journal’s impact factor are frequently used to evaluate the achievement of scientists.

Materials and Methods

A total of 61 orthopedics-related journals were selected from the orthopedics category of the Science Citation Index Expanded (SCIE) database.3 A computerized literature search was conducted using the SCIE database on February 20, 2012, and the orthopedics articles published from January 2000 to December 2011 in these journals were retrieved. The full journal titles of the 61 journals were used to perform searches in the SCIE database.

Three methods were used to evaluate the quality of the research articles. First, the impact factor was generated according to Journal Citation Reports 2010. Second, the distribution of articles by authors’ country of origin and the total number of citations were analyzed. Third, the articles published in orthopedics journals with top-10 impact factors were also quantified.

Statistical analyses were performed using SAS version 9.1.3 statistical software (SAS Institute Inc, Cary, North Carolina). The nonparametric test for trends was used to determine significant changes in the total number of articles over the study period. The Kruskal-Wallis test was used to determine the differences in the proportion of yearly world contributions to orthopedics by the United States, the United Kingdom, Germany, Japan, China, and South Korea, and the rank sum test was used to detect the difference in the growth rate between China and the world, if needed. The test for significance was 2-sided, and a P value less than .05 was considered significant.4

Results

A total of 91,216 articles were published in the 61 orthopedics journals from 2000 to 2011. Table 1 shows the year-by-year output. The outputs in 2010 (10,276 articles) and 2011 (10,087 articles) were approximately twice that of 2000 (5161 articles), a growth rate of approximately 40%. In calculating the annual growth rate for each year, 2004 had the fastest growth (14.02%), followed by 2007 (11.39%) and 2006 (11.24%); 2001 had the lowest growth (1.88%), followed by 2009 (2.20%) and 2003 (2.70%).

Number of Articles Per Year and Growth Rate, 2000–2011

Table 1:

Number of Articles Per Year and Growth Rate, 2000–2011

Authors’ Countries of Origin

The contributions of authors from different countries were plotted, with a focus on the top 10 countries according to publication count and those in Asia.

From a total of 91,216 articles, the United States ranked first in output (36,222; 39.71%), followed by the United Kingdom (7745; 8.49%), Germany (6979; 7.65%), and Japan (5686; 6.23%). Japan ranked 1st in Asia, followed by South Korea, which ranked 10th in the world (2262; 2.48%). China ranked 12th in the world (1973; 2.16%) and 3rd in Asia (Table 2).

Top 10 Countries According to Number of Articles Plus China, 2000–2011

Table 2:

Top 10 Countries According to Number of Articles Plus China, 2000–2011

Although authors from the United States contributed the largest number of articles, the proportion of US articles showed a declining trend between 2000 (43.64%) and 2011 (35.07%). Before 2008, little difference existed between Germany and Japan; after 2008, Germany (8.18%) exceeded the United Kingdom (7.99%) and ranked 2nd in the world (Table 3; Figure 1).

Proportion of World Contribution to Orthopedics by Year, 2000–2011

Table 3:

Proportion of World Contribution to Orthopedics by Year, 2000–2011

Line graph showing publication counts between 2000 and 2011.

Figure 1:

Line graph showing publication counts between 2000 and 2011.

China showed an improvement in orthopedics research, with articles published in international journals increasing significantly during the study period. In 2010, China (3.41%) overtook South Korea (3.34%) to become 2nd in Asia. In 2011, China (5.05%) narrowed its gap with Japan (5.58%) to rank 5th in the world (Tables 3 and 4; Figure 1).

Top 10 Countries According to Number of Articles per Year, 2000–2011

Table 4:

Top 10 Countries According to Number of Articles per Year, 2000–2011

Citation analysis for the retrieved articles (Table 5; Figure 2) indicated that US-authored articles were cited the highest number of times (396,797), followed by the United Kingdom (71,129), Germany (52,644), Japan (43,900), South Korea (13,863), and China (9225). Articles by US authors had the highest average per-article citation (10.96), followed by the United Kingdom (9.18), Japan (7.72), Germany (7.54), South Korea (6.13), and China (4.68) (Tables 2 and 5).

Total Citations of Articles per Year, 2000–2011

Table 5:

Total Citations of Articles per Year, 2000–2011

Line graph showing numbers of citations between 2000 and 2011.

Figure 2:

Line graph showing numbers of citations between 2000 and 2011.

Most Prolific Authors

An author analysis was conducted for the retrieved articles to determine the top 100 authors according to publication counts. Researchers were ranked based on their number of articles and citations (Tables 68). Among the top 100 most prolific authors, 43 were American, 19 were Japanese, 6 were Korean, 5 were German, 4 were English, and 23 were from other countries. Table 7 shows that among the top 10 most published authors, 4 were American, 2 were English, 2 were Japanese, 1 was Canadian, and 1 was Korean. The number of publications for the top 10 authors ranged from 258 (1st place) to 185 (10th place). Table 8 shows the citation ranking of the top 10 authors, ranging from 4672 (1st) to 2261 (10th).

Country Distribution of Top Authors According to Number of Articles, 2000–2011

Table 6:

Country Distribution of Top Authors According to Number of Articles, 2000–2011

Top 10 Authors According to Number of Articles, 2000–2011

Table 7:

Top 10 Authors According to Number of Articles, 2000–2011

Top 10 Authors According to Number of Citations, 2000–2011

Table 8:

Top 10 Authors According to Number of Citations, 2000–2011

P.V. Giannoudis, from the United Kingdom, was the most prolific author, publishing 258 articles during the study period; Freddie Fu, from the United States, was the most-cited author (4672 citations). The top 5 prolific authors all had citations within the top 10, including P.V. Giannoudis (United Kingdom), J. Parvizi (United States), A.R. Vaccaro (United States), M. Bhandari (Canada), and L.G. Lenke (United States). Citation rates for authors not in the top 10 were not necessarily low. For example, the 112 articles by R. Ganz (Switzerland) ranked him in 35th place overall, but his articles ranked 3rd in total number of citations (n=4447). K.H. Bridwell (United States) ranked 16th (n=169) in number of articles and 4th (n=3728) in total number of citations.

Most Prolific Institutions

An analysis of academic institutions was conducted for the retrieved articles to determine the top 100 institutions according to publication counts. The institutions were ranked according to the numbers of articles and citations (Tables 911).

Country Distribution of Top Affiliations According to Number of Articles, 2000–2011

Table 9:

Country Distribution of Top Affiliations According to Number of Articles, 2000–2011

Top 10 Institutions According to Number of Articles, 2000–2011

Table 10:

Top 10 Institutions According to Number of Articles, 2000–2011

Ranking of Top 10 Institutions According to Citation, 2000–2011

Table 11:

Ranking of Top 10 Institutions According to Citation, 2000–2011

Among the top 100 most prolific institutions, 59 were in the United States, 5 in Germany, 5 in the United Kingdom, 4 in Japan, 2 in South Korea, and 1 in China (Table 9). Table 10 shows that the 10 most prolific institutions were all in the United States. The number of publications by the top 10 institutions ranged from 1258 (1st place) to 640 (10th place). Table 11 shows the rankings of the top 10 institutions according to their total citations, which ranged from 17,752 to 9107. The Hospital for Special Surgery (United States) was the most prolific institutional source of orthopedic articles, with 1258 articles about orthopedics, whereas the University of Pittsburgh ranked first in total number of citations (n=17,752). Total number of citations for the top 5 most prolific institutions—the Hospital for Special Surgery, Harvard University, the Mayo Clinic, Washington University (St Louis), and the University of Pittsburgh—were all in the top 10.

However, the total citations for institutions outside of the top 10 were not necessarily low. For example, the University of Bern (Switzerland) ranked 25th in number of articles (n=453) and 8th in total number of citations (n=9737).

Journal Distribution: Most Popular Orthopedic Journals

A source publication analysis was conducted for the retrieved articles to determine the top 10 most popular journals according to publication counts (Table 12). Spine ranked the first in number of articles (n=7902; impact factor, 2.51), Clinical Orthopedics and Related Research ranked second (n=6243; impact factor, 2.116), and the Journal of Bone and Joint Surgery, British Volume ranked third (n=5662; impact factor, 2.967).

Top 10 Journals According to Number of Articles, 2000–2011

Table 12:

Top 10 Journals According to Number of Articles, 2000–2011

High-impact Orthopedic Journals

The 61 journals were ranked according to their impact factor, and the number of articles published in the top 10 journals was analyzed according to the authors’ country of origin (Table 13). Osteoarthritis and Cartilage had the highest impact factor (3.953), the American Journal of Sports Medicine ranked 2nd (3.821), and Arthroscopy ranked 3rd (3.317). As shown in Table 13, authors from the United States published the most articles (n=15,835) in the journals with a top 10 impact factor, followed by those from Japan (n=1928) and the United Kingdom (n=1359).

Top 10 Journals According to Impact Factor and Number of Articles, 2000–2011

Table 13:

Top 10 Journals According to Impact Factor and Number of Articles, 2000–2011

Discussion

According to classical bibliometric theory, an increase or decrease in the publication of scientific literature indicates the speed of progress of science and technology, and the period needed for the doubling of scientific literature can be used to measure scientific development. An acute change in the number of published articles likely reflects a turning point in the development of the science.5 The current study found that the number of orthopedics articles published dramatically increased between 2000 and 2011, when the number doubled, indicating an important turning point for the rapid development of orthopedics and the achievements that have been made. Another reason for the increase is the increase of orthopedics journals found in the SCIE database.

The geographic and language distributions of scientific literature can mirror the research capabilities and technological developments of different countries.5 This study found that the top 10 countries’ authors published 81.39% of the total orthopedics articles, indicating that the worldwide research efforts in orthopedics were actually concentrated, with the United States publishing the most articles and making the greatest contribution, followed by the United Kingdom and Germany.

The contribution rankings of countries underwent variation in the past decade, but the variation was mild. The United States still ranked first but showed a declining trend year by year, a trend that was also true for other traditionally strong countries, such as the United Kingdom and Japan. However, Germany, Korea, and China showed an increase in orthopedics publishing. In 2011, China ranked 5th in the world, with the proportion increasing from 0.64% in 2000 to 5.05% in 2011.

Researchers believe that the total citation rate for an article can reflect the quality and value of the research it reports. Citation analysis can thus be used to evaluate and compare the academic position of different countries and research institutions.5 An investigation of the citation rates for the orthopedic articles under analysis showed that the United States ranked first in terms of total citations and average citations per article. Although the number of articles published by Japanese authors was lower than those published by German authors, their total citations and average citations per article were both higher than those of German authors, indicating a stronger influence for Japanese articles. China also witnessed a rapid increase in the number of published orthopedics articles, but its total citations and average citations per article were small.

An analysis of prolific authors in orthopedics showed that the United States and Japan had the most prolific authors because these 2 countries had the most-cited orthopedics researchers. Analysis of the top research institutions found that the United States had the greatest number of top research institutions for orthopedics, demonstrating that the United States is currently the strongest power in orthopedics research. If the impact factor is the most important quality indicator for scientific journals, then US authors published the most articles in the top 10 orthopedics journals.

The results of the analyses of number of articles, citation status, top researchers, and top institutions all showed that the United States is the strongest country in orthopedics research, and the United Kingdom, Germany, and Japan were always within the world’s top 4 in terms of number of articles and citation status. China has shown a rapid increase and is now ranked fifth in terms of number of articles. However, China is lagging behind in terms of citations per article, top research institutions, and most prolific authors.

Current changes in Chinese orthopedic research are due to several factors. First, the number of research institutions has grown and clinical orthopedic practice and research capabilities have improved with recent advances in China’s economy. Chinese orthopedic researchers now have more chances to communicate with their international partners.6 Second, the Chinese government and various academic and research institutions now regard the number of articles indexed in the SCIE database as an important indicator of the research ability and achievements of a researcher or an institution, and these evaluation outcomes are now typically related to an author’s technical title, salary, bonus, and other important benefits, which stimulates an interest in research. However, these changes seem to have resulted only in an increase in number of articles and not in their quality, as indicated by the current citation rates for Chinese-authored articles.

One of the limitations of this study is that only the 61 orthopedics journals covered by the SCIE database were analyzed; some orthopedics articles are also published in multispecialty medical journals.

Conclusion

This bibliometric analysis showed that orthopedics research witnessed rapid development between 2000 and 2011. The United States is the strongest country in terms of orthopedic research: US authors published the greatest number of orthopedics articles, and those articles have the highest total number of citations and average citations per article. Moreover, the United States has the most prolific authors and the most top research institutions. Japan is the strongest country in Asia in terms of published orthopedic research. China demonstrates rapid progress in orthopedic research thanks to its rapid economic development and growth in research funding.

The purpose of this study was to evaluate the scientific productivity of orthopedics research by bibliometric methods. Among the benefits of this study is the potential for the professional orthopedics community to discover a new perspective on their own discipline and its subfields. The authors’ work in this area is ongoing.

References

  1. Middleton A. An attempt to quantify the quality of student bibliographies. Perform Meas Metr. 2005; 6(1):7–18. doi:10.1108/14678040510588553 [CrossRef]
  2. Journal Citation Reports 2010. Institute for Scientific Information Web site. http://isiknowl-edge.com. Accessed February 20, 2012.
  3. Orthopedics journals. Journal Citation Reports 2010. Institute for Scientific Information Web site. http://www.isinet.com/cgi-bin/jrnlst/jlsub-catg.cgi?PC=D. Accessed February 20, 2012.
  4. May WL, Johnson WD. A SASR macro for the multivariate extension of the Kruskal-Wallis test including multiple comparisons: randomization and 2 criteria. Comput Stat Data Anal. 1997; 26(2):239–250. doi:10.1016/S0167-9473(97)82107-X [CrossRef]
  5. Qiu JP. Informetrics: application of informetrics in science of science and management of science and technology. Inf Stud Theory Appl. 2001; 24(6):474–478.
  6. 30th Anniversary of the Chinese Orthopedic Association (COA). Chinese Orthopedic Assocation Web site. http://www.orthonline.com.cn/html/folder/2208222-1.htm. Accessed February 20, 2012.

Number of Articles Per Year and Growth Rate, 2000–2011

Year No. of Articles Growth Rate, % No. of Journals
2000 5161 39
2001 5258 1.88 42
2002 5750 9.36 42
2003 5905 2.70 41
2004 6733 14.02 42
2005 6977 3.62 41
2006 7761 11.24 43
2007 8645 11.39 48
2008 9230 6.77 49
2009 9433 2.20 56
2010 10,276 8.94 61
2011 10,087 21.84 61

Top 10 Countries According to Number of Articles Plus China, 2000–2011

Rank No. of Articles Country World Share, %
1 36,222 United States 39.71
2 7745 United Kingdom 8.49
3 6979 Germany 7.65
4 5686 Japan 6.23
5 4352 Canada 4.77
6 3315 France 3.63
7 2732 Austria 3.00
8 2491 Switzerland 2.73
9 2457 Netherlands 2.69
10 2262 South Korea 2.48
12 1973 China 2.16

Proportion of World Contribution to Orthopedics by Year, 2000–2011

Year %
United States United Kingdom Germany Japan China Korea
2000 43.64 8.89 7.25 6.14 0.64 0.95
2001 42.49 8.55 7.24 6.67 0.87 1.18
2002 44.14 8.38 7.58 6.59 0.63 1.04
2003 45.86 8.99 7.40 6.35 1.25 1.74
2004 44.44 8.79 7.55 7.25 1.04 1.38
2005 42.01 10.06 6.74 7.38 1.46 1.99
2006 41.98 8.81 6.83 6.70 1.51 1.95
2007 38.39 9.03 7.53 6.02 1.82 2.68
2008 36.96 7.99 8.18 5.71 2.25 2.98
2009 35.87 8.45 8.44 5.83 2.79 3.52
2010 35.47 7.40 8.20 5.64 3.41 3.34
2011 35.07 7.61 7.98 5.58 5.05 4.13

Top 10 Countries According to Number of Articles per Year, 2000–2011

Year 1 2 3 4 5 6 7 8 9 10
2000 US UK GER JPN CAN FRA SUI SWE AUS NED
2001 US UK GER JPN CAN FRA SWE AUS SUI NED
2002 US UK GER JPN CAN FRA SUI AUS NED SWE
2003 US UK GER JPN CAN FRA AUS SUI NED TUR
2004 US UK GER JPN CAN FRA AUS SUI TUR NED
2005 US UK GER JPN CAN FRA AUS NED TUR SUI
2006 US UK GER JPN CAN FRA SUI SWE AUS NED
2007 US UK GER JPN CAN FRA AUS NED KOR TUR
2008 US GER UK JPN CAN FRA TUR KOR NED AUS
2009 US UK GER JPN CAN FRA KOR TUR NED CHN
2010 US GER UK JPN CAN FRA NED AUS CHN KOR
2011 US GER UK JPN CHN CAN KOR AUS FRA SUI

Total Citations of Articles per Year, 2000–2011

Year No. of Citations
United States United Kingdom Germany Japan Korea China
2000 288 62 57 31 1 0
2001 2096 354 267 217 25 18
2002 5490 841 720 609 118 62
2003 10,034 1547 1348 1109 221 136
2004 16,518 2563 2111 1774 406 221
2005 24,129 3761 2984 2577 563 350
2006 33,062 5433 4110 3518 858 500
2007 42,243 7222 5522 4767 1288 710
2008 51,662 9186 6778 5929 1727 1176
2009 61,534 11,251 8147 6833 2275 1425
2010 73,000 13,588 9945 7952 2823 1998
2011 76,741 15,321 10,655 8584 3558 2629
Total 396,797 71,129 52,644 43,900 13,863 9225

Country Distribution of Top Authors According to Number of Articles, 2000–2011

Rank No. of Authors Country
1 43 US
2 19 Japan
3 6 South Korea
4 5 Germany
5 4 UK
0 China

Top 10 Authors According to Number of Articles, 2000–2011

Rank Author No. of Articles No. of Citations H-index Average Citations per Article Country
1 Giannoudis 258 2817 27 10.92 UK
2 Parvizi 237 3538 30 14.93 US
3 Vaccaro 234 2812 29 12.02 US
4 Bhandari 227 2672 27 11.77 Canada
5 Lenke 208 4492 37 21.60 US
6 Lee 205 1192 18 5.81 South Korea
7 Fu 202 4672 37 23.13 US
8 Nakamura 191 1365 20 7.15 Japan
9 Yoshikawa 191 2009 24 10.52 Japan
10 Maffulli 185 2128 24 11.50 UK

Top 10 Authors According to Number of Citations, 2000–2011

Rank Author No. of Articles No. of Citations H-index Average Citations per Article Country
1 Fu 202 4672 37 23.13 US
2 Lenke 208 4492 37 21.60 US
3 Ganz 112 4447 31 39.71 Switzerland
4 Bridwell 169 3728 33 22.06 US
5 Parvizi 237 3538 30 14.93 US
6 Giannoudis 258 2817 27 10.92 UK
7 Vaccaro 234 2812 29 12.02 US
8 Bhandari 227 2672 27 11.77 Canada
9 Warren 134 2382 28 17.78 US
10 Berry 105 2261 28 21.53 US

Country Distribution of Top Affiliations According to Number of Articles, 2000–2011

Rank No. of Affiliations Country
1 59 United States
2 5 Germany
3 5 United Kingdom
4 4 Japan
5 2 South Korea
6 1 China

Top 10 Institutions According to Number of Articles, 2000–2011

Rank Institution No. of Articles No. of Citations H-index Average Citations per Article Country
1 Hospital for Special Surgery 1258 15,312 52 12.17 US
2 Harvard U 1134 17,198 56 15.17 US
3 Mayo Clinic 1100 9874 40 8.99 US
4 Washington U 1097 14,882 50 13.57 US
5 U of Pittsburgh 1065 17,752 62 16.67 US
6 U of Toronto 763 11,587 53 15.19 US
7 U of Washington 742 11,243 49 15.15 US
8 Massachusetts General Hospital 688 9176 42 13.34 US
9 U of California San Francisco 686 9094 45 13.26 US
10 U of Pennsylvania 640 7665 41 11.98 US

Ranking of Top 10 Institutions According to Citation, 2000–2011

Rank Institution No. of Articles No. of Citations H-index Average Citations per Article Country
1 U of Pittsburgh 1065 17,752 62 16.67 US
2 Harvard U 1134 17,198 56 15.17 US
3 Hospital for Special Surgery 1258 15,312 52 12.17 US
4 Washington U 1097 14,882 50 13.57 US
5 U of Toronto 763 11,587 53 15.19 US
6 U of Washington 742 11243 49 15.15 US
7 Mayo Clinic 1100 9874 40 8.98 US
8 U of Bern 453 9737 47 21.49 SUI
9 Massachusetts General Hospital 688 9176 42 13.34 US
10 U of Texas 482 9107 44 18.89 US

Top 10 Journals According to Number of Articles, 2000–2011

Rank Journal IF No. of Articles
1 Spine 2.51 7902
2 Clinical Orthopedics and Related Research 2.116 6243
3 Journal of Bone and Joint Surgery, American Volume 2.967 5662
4 Journal of Bone and Joint Surgery, British Volume 2.351 3928
5 Injury: International Journal of the Care of the Injured 2.269 3388
6 American Journal of Sports Medicine 3.821 3032
7 Journal of Hand Surgery, American Volume 1.439 3001
8 Journal of Arthroplasty 2.207 2996
9 Orthopedics 1.098 2913
10 Osteoarthritis and Cartilage 3.953 2906

Top 10 Journals According to Impact Factor and Number of Articles, 2000–2011

Rank Journal IF No. of Articles
US UK Germany Japan South Korea China
1 Osteoarthritis and Cartilage 3.953 1183 332 243 212 37 49
2 American Journal of Sports Medicine 3.821 1599 108 190 172 97 23
3 Arthroscopy 3.317 1264 94 168 212 175 73
4 Spine 3.024 489 16 14 28 34 29
5 Journal of Orthopedic Research 2.976 1345 103 208 258 42 91
6 Journal of Bone and Joint Surgery American 2.967 3716 244 129 168 126 40
7 Physical Therapy 2.645 1031 45 22 9 3 13
8 Journal of the American Academy of Orthopedic Surgery 2.547 604 6 2 3 0 0
9 Journal of Orthopedics and Sports Physical Therapy 2.538 890 31 13 14 3 10
10 Spine 2.51 3714 380 319 852 284 352
Total 15,835 1359 1308 1928 801 680

10.3928/01477447-20130920-11

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