How long so total knee replacements last?

>10 yrs many +20: Depends on many variables but the above statement is i think true.

A long time: The materials that are used today can last a very long time. 20, 30, 40 years or more. The most common cause of failure today is infection of the tkr or fracture around the components. Having a bmi >40, underlying medical conditions like diabetes, being young, being male, and many other issues can potentially shorten the life of a total knee.

More than 20 years: There are multiple reasons why knee replacements have to be revised: wear of the plastic insert, instability, loosening, fracture of the bone, infection, technical errors at surgery, and others. Considering all reasons, there is a 1% chance per year after surgery that the knee will need to be revised (e.g. 20% chance at 20 yrs). The plastics we use now should withstand 20 years or more of wear.

15-25 years: Tka implants can last a long time in the body, with over 90% of well done tka devices still working well at 15 years. A few may fail for various reasons each year and may need to be revised. Reasons for failure can include, infection, loosening, wear, or traumatic injury. Regular followup should be maintained with your surgeon to monitor the implant and knee function.