title: Characteristics and trends of published adult hip research over the last decade.
abstract: OBJECTIVE
  We designed this study to demonstrate recent trends in the proportion of adult hip research in orthopedics, to identify countries leading the adult hip research, and to evaluate the relationship between the economic power of the countries and their contributions.
  
  
  METHODS
  Studies published in seven select orthopedic journals were retrieved from PubMed. Among them, we determined the number of adult hip studies. The countries-of-origin of adult hip studies, and the economic power of the countries were investigated.
  
  
  RESULTS
  A total of 7218 orthopedic publications and 1993 (27.6%) addressed adult hip research were identified. Adult hip studies increased from 313 (23.7%) in 2000 to 555 (27.9%) in 2011. Twenty-five countries accounted for 97.6% of the total number of adult hip studies, and gross domestic product correlated with publication volume (Spearman's rho, 0.723; p=0.000).
  
  
  CONCLUSIONS
  Researchers from a limited number of developed countries have published their studies in the adult hip discipline.
authors.affiliation: Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul, Korea.; Department of Orthopaedic Surgery, SMG-SNU Boramae Medical Center, Seoul, Korea.
authors.forename: Hong Suk
authors.initials: HS
authors.lastname: Kwak
authors.affiliation: Department of Orthopedic Surgery, Asan Medical Center, Seoul, Korea.
authors.forename: Pil Whan
authors.initials: PW
authors.lastname: Yoon
authors.affiliation: Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Moon Seok
authors.initials: MS
authors.lastname: Park
authors.affiliation: Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul, Korea. jjyos@snu.ac.kr.
authors.forename: Jeong Joon
authors.initials: JJ
authors.lastname: Yoo
authors.affiliation: Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul, Korea.; Medical Research Center, Seoul National University, Seoul, Korea.
authors.forename: Hee Joong
authors.initials: HJ
authors.lastname: Kim
mesh_terms: D000328:Adult; D005843:Geography; D006615:Hip / Q000502:physiology*; D006801:Humans; D039781:PubMed; D011642:Publications / Q000639:trends*; D012106:Research / Q000639:trends*
keywords: Hip; PubMed; publishing; research; trends