title: Patellar resurfacing in total knee arthroplasty: functional outcome differs with different outcome scores: A randomized, double-blind study of 129 knees with 3 years of follow-up.
abstract: OBJECTIVE
  Recent research on outcomes after total knee arthroplasty (TKA) has raised the question of the ability of traditional outcome measures to distinguish between treatments. We compared functional outcomes in patients undergoing TKA with and without patellar resurfacing, using the knee injury and osteoarthritis outcome score (KOOS) as the primary outcome and 3 traditional outcome measures as secondary outcomes.
  
  
  METHODS
  129 knees in 115 patients (mean age 70 (42-82) years; 67 female) were evaluated in this single-center, randomized, double-blind study. Data were recorded preoperatively, at 1 year, and at 3 years, and were assessed using repeated-measures mixed models.
  
  
  RESULTS
  The mean subscores for the KOOS after surgery were statistically significantly in favor of patellar resurfacing: sport/recreation, knee-related quality of life, pain, and symptoms. No statistically significant differences between the groups were observed with the Knee Society clinical rating system, with the Oxford knee score, and with visual analog scale (VAS) for patient satisfaction.
  
  
  CONCLUSIONS
  In the present study, the KOOS--but no other outcome measure used--indicated that patellar resurfacing may be beneficial in TKA.
authors.affiliation: a Department of Surgery , Sykehuset Innlandet , Lillehammer , Norway .
authors.forename: Eirik
authors.initials: E
authors.lastname: Aunan
authors.affiliation: b Department of Physiotherapy , Sykehuset Innlandet , Lillehammer , Norway .
authors.forename: Grethe
authors.initials: G
authors.lastname: Næss
authors.affiliation: c Department of Department of Orthopaedics , Oslo University Hospital , Oslo , Norway .
authors.forename: John
authors.initials: J
authors.lastname: Clarke-Jenssen
authors.affiliation: d Department of Oslo Center for Biostatistics and Epidemiology , Oslo University Hospital , Oslo , Norway.
authors.forename: Leiv
authors.initials: L
authors.lastname: Sandvik
authors.affiliation: c Department of Department of Orthopaedics , Oslo University Hospital , Oslo , Norway .
authors.forename: Thomas Johan
authors.initials: TJ
authors.lastname: Kibsgård
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D004311:Double-Blind Method; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D010147:Pain Measurement; D010329:Patella / Q000601:surgery*; D011788:Quality of Life; D011795:Surveys and Questionnaires; D016896:Treatment Outcome