Total knee arthroplasty for primary XXXX : changing pattern over the past 10 years.

@entity1 @entity626 @entity571 @entity348 @entity85
OBJECTIVE: To review the epidemiology of @entity348 for @entity571 and the change of @entity1 characteristics over the last decade. DESIGN: Retrospective review. SETTING: A tertiary referral centre for joint replacement surgery in a teaching hospital in Hong Kong. @entity1 : All @entity1 who underwent primary @entity348 for primary @entity626 from January 2000 to December 2009. RESULTS: In all, 1157 total knee arthroplasties (589 left and 568 right) were performed on 588 females and 162 males. The annual number of total knee arthroplasties increased from 91 in 2000 to 181 in 2009. The annual number of @entity1 increased from 58 (46 female, 12 male) in 2000 to 159 (117 female, 42 male) in 2009. When compared yearly results, there were no significant changes in the preoperative Knee Society Knee Score, Knee Society Functional Assessment, and passive range of motion of these @entity1 . However, there was a significant decreasing trend with regard to lower limb mechanical axis mal-alignment, from 15.1   deviation from the neutral axis in 2000, to 14.8   deviation in 2004, and then 12.9   deviation in 2009 (mostly @entity85 ). There was no difference between left knees and right knees, and between females and males. The mean age of the @entity1 did not show significant change over the past decade, but the number and proportion of @entity1 over 80 years old showed an increase from 4.8% (2000 to 2004) to 13.8% (2005 to 2009). On the other hand, the number and proportion of @entity1 under the age of 60 years did not change. CONCLUSIONS: There was an increasing trend towards total knee arthroplasties, both in terms of number of operations and @entity1 . The number of younger @entity1 having @entity348 did not increase over the last 10 years, whereas the number of those older than 80 years increased significantly over that period.
