The hip prosthesis is a medical device that replaces a damaged hip joint. The hip consists of a convex femoral headacetabulum within the pelvis, cushioned by articular cartilage within a synovial joint capsule.
Nowadays hip joint prostheses are made with metals, ceramics and plastic materials. Most used are titanium alloys, stainless steel, special high-strength alloys, alumina, zirconia, zirconia toughened alumina (ZTA), and UHMWPE.
Hip replacement is an operation to repair a damaged hip joint. The surgeon removes the worn-out parts of the joint and puts in an artificial joint made of metal, ceramic, or plastic. It is one of the most common surgeries done in the U.S., where more than 2.5 million people have had a total hip replacement.
Your doctor might suggest a hip replacement if you have lasting hip pain from arthritis or an injury -- pain that gets in the way of your normal activities and doesn’t go away with medication and other treatments like physical therapy. Arthritis pain is the most common reason to need hip replacement.
The new hip has a metal stem that connects into your thighbone. The stem has a metal or ceramic ball on the end that fits into a metal cup placed in the socket of your hip joint. A plastic or ceramic liner goes between the ball and cup to help the joint glide. Your surgeon may cement the new hip to the bone or use a hip designed to allow your bone to grow onto it and attach itself.
Your new hip is designed to serve you well for a long time, but it won’t last forever. If you’re young and active, you may need the same hip replaced again down the road. 95% of hip replacements last at least 10 years, about 75% last 15 to 20 years, and just over half last 25 years or more. To help keep your artificial hip in good shape longer, stay active but avoid high-impact activities, and stay at a healthy weight.