title: Relationship between patient-based outcome score and conventional objective outcome scales in post-operative total knee arthroplasty patients.
abstract: OBJECTIVE
  Evaluations for knee osteoarthritis (OA) or post-operative total knee arthroplasty (TKA) have mainly been assessed by objective scales. Though the Knee injury and Osteoarthritis Outcome Score (KOOS) is attracting attention as a patient-based outcome score, the relationship with conventional objective scales after TKA remains controversial. The purpose of this study was to investigate the relationship between KOOS and conventional objective scales and evaluate the features of patient-based outcome scores.
  
  
  METHODS
  Subjects were 130 post-operative patients involving 186 knees treated with TKA. Their mean age was 74.0 ± 8.0 years, and the follow-up period was 43 months. Japanese Orthopaedic Association (JOA) score, original Knee Society Score (KSS) and surgeon's satisfaction score were scored as conventional objective scales besides KOOS. Spearman's correlation coefficient was estimated between these scales. Comparisons between OA and rheumatoid arthritis (RA) as well as primary and revision surgery were performed by the Mann-Whitney U test.
  
  
  RESULTS
  There were strong correlations between KOOS activities of daily living (ADL) and JOA score (r = 0.806), KSS function score (r = 0.803) and between KOOS pain and KSS knee score (r = 0.689). However, there was a poor correlation between KOOS and surgeon's satisfaction score (r = 0.188-0.321). TKA for RA showed poorer results only in KOOS pain (p = 0.003), and revision surgery showed poorer results in KSS function, KOOS symptoms and KOOS quality of life (QOL).
  
  
  CONCLUSIONS
  This study suggested that conventional objective scales reflected mainly ADL disturbances in post-operative TKA patients. Furthermore, patient-based outcome scores made it possible to evaluate and detect a minute change of knee pain and QOL in TKA patients. The Japanese KOOS was a useful tool to evaluate conditions after TKA.
authors: Department of Orthopaedic Surgery, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki, 036-8562, Aomori, Japan, e_sasaki@cc.hirosaki-u.ac.jp.
authors: Eiji
authors: E
authors: Sasaki
authors: Eiichi
authors: E
authors: Tsuda
authors: Yuji
authors: Y
authors: Yamamoto
authors: Shugo
authors: S
authors: Meada
authors: Hironori
authors: H
authors: Otsuka
authors: Yasuyuki
authors: Y
authors: Ishibashi
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D018771:Arthralgia / Q000453:epidemiology; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D006801:Humans; D015994:Incidence; D007564:Japan; D007719:Knee Joint / Q000000981:diagnostic imaging; D008297:Male; D020370:Osteoarthritis, Knee / Q000601:surgery*; D017063:Outcome Assessment, Health Care / Q000379:methods*; D063868:Patient Outcome Assessment; D011184:Postoperative Period; D011788:Quality of Life; D011859:Radiography; D012189:Retrospective Studies; D057566:Self Report; D011795:Surveys and Questionnaires; D016896:Treatment Outcome
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