RPWB is also investigating defective knee implant claims against a variety of manufacturers, including Johnson & Johnson and DePuy. Many people who obtain knee implants find that they later need revision surgery to correct a host of problems that have arisen with the implanted devices. In particular, some knee systems contain polyethylene components that are sterilized with gamma radiation in air. This process weakens and degrades the polyethylene components, thus rendering the system defective. Even after implantation, the system is subject to further degradation. It is not uncommon for the system breakdowns to create debris in the human body, such as bone chips or particles of bone cement and metal.
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