Modern knee replacements have made a drastic improvement with the invention of highly cross-linked polyethylene. Polyethylene is the plastic component within your knee replacement. Traditionally, these plastic components are expected to last up to 20 years in 90% of people. With newer plastic components, we are hopeful that knee replacements will last even longer.
There are newer knee components including those made from Vitamin E or ceramic, which may reduce the wear of the plastic component.
The length of time that a knee replacement will last is variable. While the current generation of knee implants are expected to last most of our patient’s lifetimes. Orthopedic surgeons worry that high levels of activity, weight, or other complications such as infection or loosening could lead to the need for revision.