Comparative analysis of surface wear from total hip prostheses tested on a mechanical simulator according to standards ISO 14242-1 and ISO 14242-3

Development of a protocol for the performance evaluation of wear machines used in tests of joint prostheses

“…The reader interested in a deeper study on comparative wear rates for prostheses tested on the simulator under several conditions can refer to [32].…”

“…The simulator can be set-up according to the desired ISO patterns and is able to control angular inputs for the X, Y, and Z axes (see Fig. 2 [32]) that follow their respective angular motion history at a rate of 1 Hz. The load history, which is the same for both standards (ISO 14242-1 and ISO 14242-3), is obtained by the motion of the axis A which, through a lever system, applies the loads in the Z-direction coincident with the centroid of the biaxial platform [32].…”

“…The 2.5 L capacity test chamber (where the implants are immersed in the fluid lubricant), is made of stainless steel AISI 316L, and the edges are made of acrylic and sealed by a latex film, as shown in [32] Fig. 3.…”

“…A temperature sensor and an electrical resistance are used by a digital controller to keep the fluid at 37± 2°C [32].…”

Quantitative evaluation of parameters used in wear testing simulators of total hip arthroplasty components

“…Results state that the mean rugosity (R a ) of specimens tested according to ISO 14242-1 was around eight times higher than those of the new parts whereas, for pairs probed under ISO 14242-3 conditions, this value was more than ten times higher. This way, it was possible to conclude that ISO 14242-3 testing conditions were responsible for the severe damage impinged on the rolling surfaces of prosthetic components [15].…”