title: Scoliosis: density-equalizing mapping and scientometric analysis.
abstract: BACKGROUND
  Publications related to scoliosis have increased enormously. A differentiation between publications of major and minor importance has become difficult even for experts. Scientometric data on developments and tendencies in scoliosis research has not been available to date. The aim of the current study was to evaluate the scientific efforts of scoliosis research both quantitatively and qualitatively.
  
  
  METHODS
  Large-scale data analysis, density-equalizing algorithms and scientometric methods were used to evaluate both the quantity and quality of research achievements of scientists studying scoliosis. Density-equalizing algorithms were applied to data retrieved from ISI-Web.
  
  
  RESULTS
  From 1904 to 2007, 8,186 items pertaining to scoliosis were published and included in the database. The studies were published in 76 countries: the USA, the U.K. and Canada being the most productive centers. The Washington University (St. Louis, Missouri) was identified as the most prolific institution during that period, and orthopedics represented by far the most productive medical discipline. "BRADFORD, DS" is the most productive author (146 items), and "DANSEREAU, J" is the author with the highest scientific impact (h-index of 27).
  
  
  CONCLUSIONS
  Our results suggest that currently established measures of research output (i.e. impact factor, h-index) should be evaluated critically because phenomena, such as self-citation and co-authorship, distort the results and limit the value of the conclusions that may be drawn from these measures. Qualitative statements are just tractable by the comparison of the parameters with respect to multiple linkages. In order to obtain more objective evaluation tools, new measurements need to be developed.
authors.affiliation: Institute of Occupational Medicine, Charité-Universitätsmedizin Berlin, Free University Berlin and Humboldt-University Berlin, Germany. karin.vitzthum@charite.de
authors.forename: Karin
authors.initials: K
authors.lastname: Vitzthum
authors.forename: Stefanie
authors.initials: S
authors.lastname: Mache
authors.forename: David
authors.initials: D
authors.lastname: Quarcoo
authors.forename: Cristian
authors.initials: C
authors.lastname: Scutaru
authors.forename: David A
authors.initials: DA
authors.lastname: Groneberg
authors.forename: Norman
authors.initials: N
authors.lastname: Schöffel