Evaluation of Two Total Hip Bearing Materials for Resistance to Wear Using a Hip Simulator

Abstract

Electron beam crosslinked ultra high molecular weight polyethylene (UHMWPE) 32 mm cups with cobalt alloy femoral heads were compared with gamma-irradiation sterilized 26 mm cups and zirconia ceramic heads in a hip wear simulator. The testing was performed for a total of ten million cycles with frequent stops for cleaning and measurement of mass losses due to wear. The results showed that the ceramic on UHMWPE bearing design exhibited higher early wear than the metal on highly crosslinked samples. Once a steady state wear rate was reached, the wear rates of the two types of hip bearing systems were similar with the ceramic on UHMPWE samples continuing to show a slightly higher rate of wear than the highly crosslinked samples. The wear rates of each of the tested systems appear to be consistent with the expectations for low rates of wear in improved hip replacement systems.

Adopted walking condition for computational simulation approach on bearing of hip joint prosthesis: review over the past 30 years

“…Unfortunately, without active participation from patients during conducted study, research with this approach could not provide meaningful results. The second approach is achieved by experimental tools, such as hip joint simulator [ 23 ], pin-on-disc [ 24 ], pin-on-plane [ 25 ], ball-on-disc [ 26 ], and ball-on-plane [ 27 ]. Experimental testing requires sophisticated and high-cost equipment becomes major obstacle for many researchers.…”