<qa>  What is the name of the acetabular cup liner made out of?In spite of the improvements in THA, little change has occurred for the acetabular cup liner, which is usually made out of Ultra High Molecular Weight Polyethylene plastic UHMWPe. Because it is plastic and inherently soft and somewhat pliable under load, the cups articular surface must inevitability wear and produce debris. This biologic response is now thought to be a significant contributor to prosthetic component loosening, a primary failure mode of THR. UHMWPe also degrades with time in the body. As concerns about polyethylene wear and the associated untoward effects of the generated wear debris, and as THA continues to be used in younger and higher-demand patients with increasing life expectancies, interest in ceramic on ceramic total hip prosthesis has been renewed. 