Wear test
Regarding wear resistance, it has been widely demonstrated that crosslinked UHMWPE wear is not measurable using normal test parameters. For this reason, Medacta^® performed wear tests, simulating critical conditions, matching HIGHCROSS^® with CoCrMo heads abraded with hydroxyapatite powder to increase their roughness. The results show that HIGHCROSS^® treated liners have significantly greater wear resistance than standard UHMWPE liners.
Optical microphotographs of the worn surface after 10 million cycles show that standard UHMWPE liners have no machining marks left (due to the wear process). On the contrary HIGHCROSS^® liners still show the lathe machining marks¹.

Mechanical tests
Regarding the mechanical properties, after artificial aging, HIGHCROSS^® better maintains its mechanical properties compared to a 25 kGy gamma ray sterilised UHMWPE.