First, a little history is in order to see how a medical device like a Depuy ASR artificial hip gets to the market (and ultimately, into your body).
What is a total hip replacement?
A “total hip replacement” replaces the body’s hip joint with an artificial one, and these artificial hips are usually made out of metal or plastics. A total hip replacement typically consists of four separate parts: (1) a stem, (2) a head, (3) a liner, and (4) a cup (called an “acetabular cup” or shell). After the surgeon hollows out the patient’s femur bone, the stem is implanted. The head is a metal ball that is fixed on top of the stem. The femoral head forms the hip joint when it is placed inside the liner and the cup (the “acetabular shell”).