Since 2006 over 12,000 hip replacement patients in the United States have been implanted with a Zimmer Durom Cup Replacement component. The one-piece design of these implants makes them radically different from the popular replacement devices of previous decades which were made in three parts. Doctors were impressed by the high success rate enjoyed by the cups in the European market in the three years prior to their approval in the United States. However, when the devices started failing in many American patients, physicians rapidly became alarmed.