title: Changing trends in total knee replacement.
abstract: BACKGROUND
  This study evaluates a possible change in the demographics and surgical practice observed in a large cohort of patients undergoing total knee replacement (TKR).
  
  
  METHODS
  We performed a retrospective analysis of a prospectively collected data on two groups of consecutive patients undergoing primary TKR. Group one consisted of patients who underwent surgery between 1994 and 1998. Group two consisted of patients who had surgery between 2009 and 2012.
  
  
  RESULTS
  The mean age of group two was significantly greater than that of group one: 68.9 years (68.1-69.7 years) for group one versus 70.1 years (69.6-70.6 years) for group two (p = 0.009). The mean BMI of group two was significantly greater than that of group one: 29.5 kg/m2(29.0-29.9 kg/m2) for group one versus 32.0 kg/m2(31.7-32.3 kg/m2) for group two (p < 0.001). The mean pain component of the AKSS was significantly worse in group one than in group two: 28.6 (27.2-30.0) for group one versus 35.5 (34.6-36.4) for group two (p < 0.001). The mean function component of the AKSS was significantly worse in group one than in group two: 48.6 (47.3-49.9) for group one versus 51.5 (50.7-52.3) for group two (p < 0.001).
  
  
  CONCLUSIONS
  This study describes the change in demographics of patients undergoing TKR in our institution over the last two decades.
authors.affiliation: Victoria Hospital, Hayfield Road, Kirkcaldy, KY2 5AH, UK. ewangoudie@gmail.com.
authors.forename: Ewan B
authors.initials: EB
authors.lastname: Goudie
authors.affiliation: Victoria Hospital, Hayfield Road, Kirkcaldy, KY2 5AH, UK.
authors.forename: Cal
authors.initials: C
authors.lastname: Robinson
authors.affiliation: Victoria Hospital, Hayfield Road, Kirkcaldy, KY2 5AH, UK.
authors.forename: Phil
authors.initials: P
authors.lastname: Walmsley
authors.affiliation: Victoria Hospital, Hayfield Road, Kirkcaldy, KY2 5AH, UK.
authors.forename: Ivan
authors.initials: I
authors.lastname: Brenkel
mesh_terms: D000367:Age Factors; D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods* / Q000639:trends*; D015992:Body Mass Index; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D005544:Forecasting; D006801:Humans; D007902:Length of Stay; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000601:surgery*; D011237:Predictive Value of Tests; D011475:Prosthesis Failure; D016059:Range of Motion, Articular / Q000502:physiology*; D020127:Recovery of Function; D012189:Retrospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D013997:Time Factors; D016896:Treatment Outcome; D006113:United Kingdom
keywords: BMI; Demographics; Osteoarthritis; Total knee replacement