Longevity of the TKR depends on the multiple factors but as per registry data the survivorship of knee arthroplasty is 95% upto 15 years .
It depand on patient factor like body weight , bone quality , use of implant in daily routine life ,
In surgical prospective how the surgery is done , component placement , surgeon skill and finally implant type .
Today various categories of implants are available like CoCr ,TiNbn , Coated knee , HiFlex design knees
All these are best in quality .
It's patient choice what they want to be replaced.