Performance of thin Vivacit-E hip liners: no relevant wear during ex vivo testing at high acetabular inclination angle

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022
Major/Subject
Mcode
Degree programme
Language
en
Pages
5
901-905
Series
Acta Orthopaedica, Volume 93
Abstract
Background and purpose — There is concern among clinicians regarding the performance of thin, highly cross-linked polyethylene acetabular liners at high inclination angles that cause edge contact and high contact stresses. We studied ex vivo wear performance of thin, vitamin-E grafted, highly cross-linked polyethylene (Vivacit-E) liners in rela-tion to high acetabular inclination angle. Materials and methods — Wear of Vivacit-E acetabu-lar liners (thickness 4.0–5.7 mm) was studied with a vali-dated hip joint simulator at 2 different acetabular inclination angles, 40° (optimal) and 65° (high). The test simulated walking. Wear was evaluated gravimetrically and dimen-sionally. Results — At the optimal inclination angle, slight weight gain occurred. At the high angle, the liners lost weight slightly. Due to the minimal weight loss, gravimetric wear rates were difficult to determine. Linear wear was below the detection limit of 0.01 mm. Conclusion — Even with the high acetabular inclination angle, the prostheses performed well in the present test conditions. The wear rates of the liners were estimated to be clearly below the osteolysis threshold of 0.05 mm/year, below which osteolysis is absent. Since the present hip joint simulator has been shown to produce clinically relevant wear, these ex vivo results are likely to reflect the in vivo behavior of the design.
Description
Funding Information: cal approval by an ethical review board was not needed. Data produced in the present study is available by request from VS. The study was funded by Aalto University. The authors declare that they have no conflicts of interest related to the present study. Publisher Copyright: © 2022 The Author(s). Published by Medical Journals Sweden, on behalf of the Nordic Orthopedic Federation.
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Citation
Saikko , V , Neuvonen , P & Reito , A 2022 , ' Performance of thin Vivacit-E hip liners: no relevant wear during ex vivo testing at high acetabular inclination angle ' , Acta Orthopaedica , vol. 93 , pp. 901-905 . https://doi.org/10.2340/17453674.2022.5359