Metal Ball and Polyethylene Liners Choice
Hip Replacement Implant Material
Because of its durability and performance, Metal-on-Polyethylene has been the leading artificial hip component material chosen by surgeons since FDA approval 30 years ago. The metal ball is cobalt chrome molybdenum alloy and the liner is polyethylene. Polyethylene is the most understood and used of all the liner materials, offering the surgeon a range of options to obtain stability in the body while the operation is underway.
This ability to adapt and customize during the surgical procedure is an important attribute of polyethylene. It is also the least expensive bearing.
All implants shed wear debris. The most active patients shed the most debris, and with polyethylene this may show up after 10 to 15 years, resulting in joint inflammation and bone loss. As a result, new wear resistant polyethylene liners have been introduced, called “highly crosslinked polyethylene.” During the manufacturing process the plastic is treated with a short burst of radiation to help the cup resist wear.
Wear rates: Metal-on-Polyethylene implants wear at a rate of about 0.1 millimeters each year.
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