Knee arthroplasty in XXXX . A report from the Swedish Knee Arthroplasty Register on 4,381 primary operations 1985-1995.

@entity1 @entity281 @entity309
The Swedish Knee Arthroplasty Register has data on 4,381 primary operations performed 1985-1995 for @entity309 . Of these, 192 were performed with unicompartmental prostheses and 4143 with tricompartmental. 77% were @entity1 and the mean age was 66 years. There were 126 first, 20 second, and 1 third revision in tricompartmental arthroplasties, mainly for loosening, @entity281 . There were 38 first, 3 second, and 1 third revision in unicompartmental arthroplasties, mainly for progression of @entity309 and loosening. Cumulative revision rates (Kaplan-Meier) were calculated. Tricompartmental knees had a 10-year cumulative revision rate of 5% and uni-knees 25%. @entity1 treated before 1990, @entity1 and @entity1 younger than 55 had higher revision rates than @entity1 treated after 1990, @entity1 and older @entity1 , respectively. Cemented tibial components resulted in lower revision rates than uncemented ones. There was no significant difference in revision rates between patellar replaced and unreplaced knees or between the 9 commonest implant types.
