Characterization of a Highly Cross-linked Ultrahigh Molecular-Weight Polyethylene in Clinical Use in Total Hip Arthroplasty

Natural History of Squeaking after Total Hip Arthroplasty

“…New or unpredicted complications have recently been identified that are inherent to these new bearing surfaces, such as metal hypersensitivity with MOM bearings [7] and smaller polyethylene debris size with highly crosslinked compared to conventional polyethylene. Despite overall lower wear rates, these complications can ultimately lead to high rates of osteolysis in the long term [15] and squeaking with hard-on-hard bearing surfaces [6,8,12,13,16,20,24,25]. The purposes of our study were to find (1) the incidence of squeaking in COC THA, (2) when it usually begins, (3) associated activities that trigger it, (4) its natural history, and (5) the outcome of revision THA for squeaking.…”

In-vivo degradation of middle-term highly cross-linked and remelted polyethylene cups: Modification induced by creep, wear and oxidation

“…Interestingly, the only short-term retrieval with implantation time close to 1 year (No. 7) showed creep deformation which was not significantly lower than those calculated from the middle term retrievals, confirming that after the initial bedding-in period the head penetration rate due to plastic deformation is low (Geller et al, 2006;Laurent et al, 2008;Manning et al, 2005), but it should be considered in the case-by-case analysis. This argument is strengthened by considering the data of Fig.…”

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

“…The devices tested were either 32 mm Co/Cr femoral heads bearing upon Zimmer ® Longevity ® polyethylene cups [67] or 26 mm Kyocera ® Zirconia heads bearing upon Kyocera polyethylene cups.…”