Cross-linking polyethylene used in artificial hips could extend joint life

. A team of researchers has been granted a third patent to continue development of a wear-resistant cross-linked polyethylene for use in artificial joints. The research team, working at Orthopaedic Hospital (Los Angeles; 800/339-6784), has been credited with discovering the new cross-linking technology. An implant made from the polyethylene received FDA clearance in 1997. The researchers have found that by cross-linking polyethylene in artificial joints, wear resistance can be increased tenfold. In current development is a new polyethylene that is cross-linked using heat and radiation, followed by gas plasma sterilization to assist in preventing oxidation. This technology could potentially produce more-durable joint implants as well as more-effective surgical procedures. According to researchers, the Marathon cross-linked polyethylene, licensed to DePuy Orthopaedics, is being scrutinized for use in other total joint replacement systems.