An artificial joint will eventually develop changes from wear and tear, even under normal use and activity conditions. It may eventually need to be replaced. Artificial joints generally last 10 to 15 years; thus, a person who is younger at the time of the joint replacement surgery may eventually need to have the new joint replaced.

Source: http://resources.purematters.com/healthy-body/joint-tissue-health/is-it-time-for-a-new-joint