title: [Recovery of knee function after total knee arthroplasty: different outcomes in patients with osteoarthritis and rheumatoid arthritis].
abstract: BACKGROUND
  Following total knee arthroplasty (TKA), no investigations have been published to assess possible differences between rheumatoid arthritic (RA) and osteoarthritic (OA) patients with respect to patient-reported outcome measures of knee function.
  
  
  METHODS
  A cohort of 128 consecutively operated patients (OA: n = 92, RA: n = 36) treated with bicondylar TKA was included in this prospective, clinical study. Knee function was assessed preoperatively and at 6 and 12 months after TKA, using the Knee Injury and Osteoarthritis Outcome Score (KOOS) and Oxford Knee Score (OKS).
  
  
  RESULTS
  Both OKS and KOOS revealed a statistically significant improvement for OA and RA patients at 6 and 12 months after surgery, as compared to the preoperative status. The results of the OKS at 6 and 12 months did not show a further improvement for either group. The KOOS, however, revealed an additional improvement between 6 and 12 months for the osteoarthritis group, regarding the total score and all subscores, but not for the RA subgroup.
  
  
  CONCLUSIONS
  Functional recovery after TKA improves in the second 6 months after surgery in OA patients, but not in RA patients, when knee function is exclusively assessed with patient-reported outcome measures.
authors.affiliation: Abteilung für Orthopädische Rheumatologie, FAU Erlangen-Nürnberg im Waldkrankenhaus St. Marien, Rathsberger Str. 57, 91054, Erlangen, Deutschland.
authors.forename: L
authors.initials: L
authors.lastname: Reiss
authors.forename: J
authors.initials: J
authors.lastname: Stolle
authors.forename: H-D
authors.initials: HD
authors.lastname: Carl
authors.forename: B
authors.initials: B
authors.lastname: Swoboda
mesh_terms: D000368:Aged; D001172:Arthritis, Rheumatoid / Q000175:diagnosis* / Q000601:surgery*; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000175:diagnosis* / Q000601:surgery*; D011788:Quality of Life; D020127:Recovery of Function; D016896:Treatment Outcome