But doctors say don't be alarmed. The squeaks are more of a nuisance than a serious problem.
Authors of the study to be released at the American Academy if Orthopedic Surgeons say it's more likely to occur in patients who are usually taller, heavier and younger.
The average time the squeaking fire begins is about 14 months after the operation.
Doctors say some people do have a second operation to silence their artificial hip if the problem is extreme.
