title: Impact of osteoarthritis on rehabilitation for persons with hip fracture.
abstract: OBJECTIVE
  To determine the impact of osteoarthritis (OA) on length of rehabilitation stay, Functional Independence Measure (FIM Instrument) ratings at discharge and followup, functional gain, and percentage of patients discharged home.
  
  
  METHODS
  We conducted a retrospective cohort analysis using a national registry of US medical rehabilitation inpatients. We obtained standardized data for all patients admitted after a hip fracture between 1994 and 2001. Our primary analytical method was multiple regression analysis. Outcome variables were length of stay, FIM Instrument ratings at discharge and followup, functional gain, and percentage of patients discharged home. The predictor variable was the presence of OA. Covariates were age, sex, race/ethnicity, other comorbidity, admission FIM ratings, total hip replacement, and time to followup.
  
  
  RESULTS
  We studied 1,953 patients with OA and 11,441 patients without OA admitted to inpatient rehabilitation facilities after hip fracture. Mean +/- SD length of stay for patients with OA was 18.1 +/- 10.0 days versus 16.5 +/- 8.9 days for those without OA (P < 0.01). After adjusting for age, sex, race/ethnicity, comorbidity, admission FIM ratings, and total hip replacement, OA was associated with a longer rehabilitation stay (1.4 days; P < 0.01) and slightly higher discharge FIM ratings; however, OA was not associated with lower weekly rehabilitation gain, followup FIM ratings, and percentage discharged home.
  
  
  CONCLUSIONS
  Persons with hip fracture and OA had longer inpatient rehabilitation length of stay than persons without OA, but there were similarities in weekly rehabilitation gain and percentage discharged home.
authors.affiliation: Division of Rheumatology, Department of Medicine, University of Texas Medical Branch, Galveston, TX 77555-1165, USA. tranguye@utmb.edu
authors.forename: Tracy U
authors.initials: TU
authors.lastname: Nguyen-Oghalai
authors.forename: Kenneth J
authors.initials: KJ
authors.lastname: Ottenbacher
authors.forename: Carl V
authors.initials: CV
authors.lastname: Granger
authors.forename: Sarah Toombs
authors.initials: ST
authors.lastname: Smith
authors.forename: James S
authors.initials: JS
authors.lastname: Goodwin
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D015897:Comorbidity; D004185:Disability Evaluation; D005260:Female; D005500:Follow-Up Studies; D006620:Hip Fractures / Q000453:epidemiology* / Q000534:rehabilitation*; D006801:Humans; D008297:Male; D010003:Osteoarthritis / Q000453:epidemiology* / Q000534:rehabilitation*; D017063:Outcome Assessment, Health Care; D011640:Public Policy; D012042:Registries; D012044:Regression Analysis; D040841:Resource Allocation / Q000706:statistics & numerical data; D012189:Retrospective Studies