title: What predicts 36-item health survey version 2 after total hip arthroplasty.
abstract: OBJECTIVE
  To identify the factors having the greatest effect on the Medical Outcomes Study 36-Item Short-Form Health Survey, version 2 (SF-36v2) score after total hip arthroplasty (THA).
  
  
  METHODS
  Retrospective review.
  
  
  METHODS
  Private 150-bed hospital.
  
  
  METHODS
  Patients (N=659) who underwent initial THA for osteoarthritis (OA) of the hip between April 2007 and January 2009. A total of 138 patients who fulfilled the inclusion criteria were seen at the first follow-up, while 108 patients were included in the second follow-up; all 30 patients excluded at the second follow-up underwent contralateral THA between follow-ups. The average time ± SD from surgery to first follow-up was 195.1±67.7 days, and that to second follow-up was 443.0±108.5 days. Patients' average age ± SD was 61.1±9.9 years at first follow-up and 61.3±10.3 years at second follow-up. Women accounted for 85.5% of patients at first follow-up and 85.2% at second follow-up.
  
  
  METHODS
  Not applicable.
  
  
  METHODS
  Eight subscales of the SF-36v2, age, sex, body mass index, complications, living alone, contralateral hip OA, range of hip joint motion, walking aids, and preoperative mental health (MH) values from the SF-36v2.
  
  
  RESULTS
  Canonical correlation analysis showed that contralateral hip OA had a major effect on the SF-36v2 score at the first follow-up. At the second follow-up, excluding the 30 patients who had undergone contralateral THA, physical function measured by the SF-36v2 was strongly affected by age, and other items were strongly affected by preoperative MH.
  
  
  CONCLUSIONS
  When using the SF-36v2 as an assessment scale after THA, adjustments should be made for contralateral hip OA. Moreover, age and preoperative MH should also be considered.
authors.affiliation: Department of Rehabilitation, Eniwa Hospital, Eniwa City, Hokkaido, Japan. ieiri.home@wit.ocn.ne.jp
authors.forename: Akira
authors.initials: A
authors.lastname: Ieiri
authors.forename: Eiki
authors.initials: E
authors.lastname: Tushima
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Ishida
authors.forename: Satomi
authors.initials: S
authors.lastname: Abe
authors.forename: Masahiro
authors.initials: M
authors.lastname: Inoue
authors.forename: Takeshi
authors.initials: T
authors.lastname: Masuda
mesh_terms: D000367:Age Factors; D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D006801:Humans; D008297:Male; D008603:Mental Health; D008875:Middle Aged; D015999:Multivariate Analysis; D015207:Osteoarthritis, Hip / Q000523:psychology* / Q000601:surgery; D017060:Patient Satisfaction; D011788:Quality of Life; D012189:Retrospective Studies; D011795:Surveys and Questionnaires; D013997:Time Factors; D016896:Treatment Outcome