@article{ATM9697,
author = {Mo Saffarini and Thomas Gregory and Eric Vandenbussche},
title = {Quantification of clearance and creep in acetabular wear measurements},
journal = {Annals of Translational Medicine},
volume = {4},
number = {7},
year = {2016},
keywords = {},
abstract = {Background: This study aimed to measure femoral head penetration before occurrence of real wear, and to quantify the portions attributable respectively to clearance and plastic deformations in various acetabular designs.
Methods: We analyzed CT scans from 15 patients at ‘day five’ after total hip arthroplasty (THA). All patients received Exafit® femoral stems and 28 mm heads: 5 patients had cemented Durasul® all-PE cups, 5 patients had uncemented Allofit® metal-backed cups, and 5 patients had un-cemented Stafit® dual-mobility cups. We also analyzed CT scans of samples of the three head-cup combinations to compare in vivo and in vitro measurements.
Results: The mean femoral head penetration measured on ‘day five’ was lower for all-PE cups (0.196 mm) than for metal-backed cups (0.551 mm) and dual-mobility cups (0.634 mm).
Conclusions: The present study indicates that isolated measurements of femoral head penetration include 0.15–0.46 mm of radial clearance and 0.05–0.27 mm of creep, and confirms that the majority of so-called beddingin observed in the first post-operative months is not entirely due to wear.},
issn = {2305-5847}, url = {https://atm.amegroups.org/article/view/9697}
}