The Nature of the Device: Hip replacements have been common for over two decades. Thousands of Americans have them every year, either because of an accident or because of age-related deterioration. Hip prostheses are made of metal, plastic, or ceramic parts that join the thigh bone to the pelvis. Biomet, Inc., DuPuy Orthopaedics, Inc., Smith & Nephew plc, Stryker Corporation, Wright Medical Group, Inc., and Zimmer, Inc. have made most of the hip replacements sold in the United States.
