title: The relationship between ASSH membership and the treatment of distal radius fracture in the United States Medicare population.
abstract: OBJECTIVE
  Internal fixation for distal radius fractures (DRFs) in the elderly has increased from 3% in 1997 to 17% in 2007. This increase has been uneven across regions of the United States. There is some evidence that patients treated by hand surgeons receive internal fixation at an increased rate and that hand surgeons might be driving the increased usage in regions where their presence is greatest. The specific aim of this study was to explore this relationship by analyzing Medicare beneficiaries treated by members of the American Society for Surgery of the Hand (ASSH).
  
  
  METHODS
  Surgeons who were members of ASSH in 2007 were matched with surgeons treating Medicare beneficiaries for DRFs in the same year. We then fit a series of multilevel models to estimate the proportion of total variance in internal fixation usage explained by ASSH membership status, patient demographic data, patient comorbidity, and/or type of fracture diagnosed.
  
  
  RESULTS
  Beneficiaries treated by ASSH members received internal fixation significantly more often than beneficiaries who were treated by surgeons who were not ASSH members. ASSH member status accounts for 12% of the total variance in internal fixation utilization.
  
  
  CONCLUSIONS
  Medicare beneficiaries who were treated by ASSH member surgeons receive internal fixation at a significantly higher rate than do patients of other physicians. When there is uncertainty about the optimal treatment for a condition, there is the possibility for specialty-related disparities. This specialty effect contributes to the national variations in the treatment of DRFs in the Medicare population.
authors.affiliation: Department of Surgery, The University of Michigan Health System, Ann Arbor, MI 48109-0340, USA. kecchung@umich.edu
authors.forename: Kevin C
authors.initials: KC
authors.lastname: Chung
authors.forename: Melissa J
authors.initials: MJ
authors.lastname: Shauver
authors.forename: Huiying
authors.initials: H
authors.lastname: Yin
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005593:Fracture Fixation, Internal / Q000379:methods*; D006801:Humans; D008297:Male; D006278:Medicare; D008511:Medicine; D015233:Models, Statistical; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data*; D011885:Radius Fractures / Q000453:epidemiology / Q000601:surgery*; D012955:Societies, Medical; D014481:United States / Q000453:epidemiology