title: Outcomes of primary total knee arthroplasty: the impact of patient-relevant factors on self-reported function and quality of life.
abstract: OBJECTIVE
  To identify factors associated with functional recovery and outcome 1 year after total knee arthroplasty (TKA).
  
  
  METHODS
  In the prospective follow-up study, all the patients (n = 75, aged 60-80 years) underwent primary TKA. Assessments were performed preoperatively and 12 months after surgery. The main measures were the Western Ontario and McMaster Universities OA Index (WOMAC) and the 15D. The clinical examination included analyses of comorbidity and a detailed knee examination. Age-standardised population values of the 15D and the Outcome Measures in Rheumatology-Osteoarthritis Research Society International (OMERACT-OARSI) criteria were used as indices of response.
  
  
  RESULTS
  Osteoporosis, pain, gender, age and preoperative function of the opposite knee accounted for 29.9% of the variance in the change in the WOMAC function score. A preoperative score of the 15D below the age-standardised population level, pain, higher age and pulmonary disease reduced the possibility to reach the HRQOL level of the general population. Osteoporosis decreased the likelihood of achieving responder status according to the OMERACT-OARSI criteria.
  
  
  CONCLUSIONS
  The baseline preoperative score of the 15D strongly associated with the achieved level of HRQOL after TKA. The findings of the present study highlight the multifactorial nature of health status in TKA.
authors.affiliation: Department of Physical Medicine and Rehabilitation, Oulu University Hospital, Oulu, 90029, Finland. anna-maija.kauppila@oulu.fi
authors.forename: Anna-Maija
authors.initials: AM
authors.lastname: Kauppila
authors.forename: Eero
authors.initials: E
authors.lastname: Kyllönen
authors.forename: Pasi
authors.initials: P
authors.lastname: Ohtonen
authors.forename: Juhana
authors.initials: J
authors.lastname: Leppilahti
authors.forename: Harri
authors.initials: H
authors.lastname: Sintonen
authors.forename: Jari P
authors.initials: JP
authors.lastname: Arokoski
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000534:rehabilitation*; D004185:Disability Evaluation; D005260:Female; D005500:Follow-Up Studies; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011446:Prospective Studies; D011788:Quality of Life; D020127:Recovery of Function; D012044:Regression Analysis; D018709:Statistics, Nonparametric