Những lợi thế của các vật liệu oxit gốm như khớp nối các bề mặt cho tổng arthroplasty đầu gối (TKA) và các thiết bị hemiarthroplasty bao gồm bôi trơn của họ lớn hơn và mài mòn, lợi ích của gốm sứ có thể không thường xuyên được truy cập bởi vì các nhân vật dễ vỡ và khó khăn trong việc chế tạo chúng | Summary The advantages of oxide ceramic materials as articulating surfaces for total knee arthroplasty TKA and hemiarthroplasty devices include their greater lubricity and abrasion resistance. Unfortunately the benefits of ceramics cannot often be accessed because of their brittle character and the difficulty of fabricating them into the necessary prosthetic shapes. There are advantages to a substance that would allow the benefits of ceramic materials to be wedded to the mechanical resiliency of a metallic substrate. With only its metallic surface transformed by oxidation into ceramic oxide oxidized zirconium OxZr alloy is such a substance. The oxidized surface of the zirconium alloy has the characteristics of zirconia ceramic for reducing wear when articulating against UHMWPE or cartilage. In addition the oxide is very durable and adherent to the underlying metal substrate. Based on laboratory investigations and early clinical results it appears that this combination of properties may contribute to the reduction of wear-related complications in arthroplasty. Prior work indicates that OxZr would be an appropriate bearing surface for total joint arthroplasty and for hemiarthroplasty and that it may have meaningful advantages over CoCr alloys. Introduction The materials employed for the fabrication of total knee replacement prostheses need to meet an array of specifications related to their mechanical performance and biocompatibility. Interrelationships among properties further challenge the selection and development of biomaterials for this application. For example all of the materials employed in TKA are biocompatible in bulk form but when present as particular debris can provoke an inflammatory response driven by macrophages that may result in degradation of tissue surrounding the implant including bone osteolysis . The tribological performance . lubrication friction and wear ofbioma-terials used for articulating applications such as TKA is of paramount .
