What concerns orthopedic surgeons is that because joint replacements have been performed primarily on older patients, there isn't a lot of data to show how these implants hold up in younger people who will have them over longer periods of time. "We use new and better materials and techniques, so we think there is an improvement in the longevity, but we still don't know. The new plastics have only been out there for three years," says Rafael J. Sierra, M.D., an orthopedic surgeon at the Mayo Clinic. The AAOS has announced the creation of the American Joint Replacement Registry to monitor replacement outcomes.
Valley Advocate, Beth Levine, 9/1/11