How accis originated The application of a ceramic surface finish articulating against itself in orthopaedic implants is relatievely new, but the application of ceramic to 
reduce wear and corrosion has been applied for longer time. Ceramic coatings are used to improve the performance, and durability and are known to reduce wear in the automotive industry. Pistons, bearings,cylinder blocks, valves and transmission components are now offered with ceramic coating.(Google "ceramic coating automotive " renders 1.4 million hits)
In the airplane industry often, both the combustion chamber and the turbine receive special ceramic coatings to improve the preformance. (Google "ceramic coating airplane" gives over 700.00 hits)
Ceramic Coated orthopaedic components articulating against polyethylene were showing increase longivity and reduced wear, have been clincially applied already for many years. Would it be possible to articulate Ceramic Coated Metal against Ceramic Coated Metal ? Since 1997 a full range of preclinical testing was performed (see the Design Rationale) untill the implant become clincally available in 2000 as a Total Hip and in 2004 as a Resurfacing Hip.