It's a finding researchers say raises concerns about the procedures. The procedures are usually preferred because recovery time can be shorter as only part of the joint is replaced.
Joint replacements need improvement
The study found about one in 75 people needed to have their hip and knee replacements redone in the three years following the original procedure. Researchers say that figure is low but it was higher for people who had new surgical techniques called hip resurfacing and unicondylar knee replacements.