A study published in The Lancet by authors at the University of Bristol Medical School in the United Kingdom shows hip and knee implants “last as long as 25 years,” according to BBC News. Using data from joint replacement registries in six countries, researchers examined 500,000 cases over the last 25 years. Data showed 58% of hip replacements, 82% of total knee replacements and 70% of partial knee replacements lasting 25 years. Full story.