UNDATED (AP) — Doctors say nearly 2 percent of Americans now have an artificial hip, knee or some other joint.

Orthopedic surgeon Daniel Berry of the Mayo Clinic says, "They are remarkable numbers."

Roughly 7 million people in the United States are living with a total hip or knee replacement.

Berry led the first major study to estimate how prevalent those procedures have become.

Results will be reported today at an American Academy of Orthopedic Surgeons conference in New Orleans.