Volume 102, Issue 8 pp. 1627-1638
Original Research Report

Edge loading does not increase wear rates of ceramic-on-ceramic and metal-on-polyethylene articulations

Jelle J. Halma

Corresponding Author

Jelle J. Halma

Department of Orthopedics, Clinical Orthopedic Research Center (CORC-mN), Diakonessenhuis Utrecht/Zeist, Bosboomstraat 1, 3582 KE, Utrecht, The Netherlands

Correspondence to: J. J. Halma (e-mail: [email protected])Search for more papers by this author
Jose Señaris

Jose Señaris

Complexo Hospitalario Universitario de Santiago de Compostela, Spain

Search for more papers by this author
Daniel Delfosse

Daniel Delfosse

Innovation Group, Mathys Ltd Bettlach, Bettlach, Switzerland

Search for more papers by this author
Reto Lerf

Reto Lerf

Innovation Group, Mathys Ltd Bettlach, Bettlach, Switzerland

Search for more papers by this author
Thomas Oberbach

Thomas Oberbach

Mathys Orthopädie GmbH, Mörsdorf, Germany

Search for more papers by this author
Steven M. van Gaalen

Steven M. van Gaalen

Department of Orthopedics, Clinical Orthopedic Research Center (CORC-mN), Diakonessenhuis Utrecht/Zeist, Bosboomstraat 1, 3582 KE, Utrecht, The Netherlands

Search for more papers by this author
Arthur de Gast

Arthur de Gast

Department of Orthopedics, Clinical Orthopedic Research Center (CORC-mN), Diakonessenhuis Utrecht/Zeist, Bosboomstraat 1, 3582 KE, Utrecht, The Netherlands

Search for more papers by this author
First published: 21 March 2014
Citations: 25

Abstract

The mal-positioning of total hip arthroplasty components can result in edge loading conditions. Purpose of this study was to determine if the wear rate of ceramic-on-ceramic and metal-on-polyethylene increases under edge loading conditions. The literature was reviewed to determine which of the commonly used hip bearings is the most forgiving to implant mal-orientation. Two 28-mm ceramic-on-ceramic articulations were tested in vitro: pure alumina (PAL) ceramic versus the new alumina-toughened zirconia (ATZ). Two 28-mm metal-on-polyethylene articulations were tested in vitro: conventional ultrahigh molecular weight polyethylene (UHMWPE) versus highly crosslinked polyethylene (HXLPE) stabilized with vitamin E. All bearings were tested at standard and at highest possible inclination angles. Hip simulator tests were run for five million cycles based on N = 3 tests per condition. The average wear rate of ATZ-on-ATZ is 0.024 mm3/Mcycles at 45° and 0.018 mm3/Mcycles at 65°. Wear rate of PAL-on-PAL is between 0.02 and 0.03 mm3/Mcycles at 45°, as well as 65°. The wear rate of UHMWPE was 31 ± 1 mm3/Mcycles at an inclination angle of 45° and 26 ± 1 mm3/Mcycles at 80°. The wear rate of vitamin E stabilized HXLPE was 5.9 ± 0.2 mm3/Mcycles at 45° and 5.8 ± 0.2 mm3/Mcycles at 80°. Edge loading does not increase the wear rate of ceramic-on-ceramic and metal-on-polyethylene articulations. The newest biomaterials showed markedly lower wear rates compared with their conventional counterparts. ATZ-on-ATZ showed the lowest wear rate of all tested pairings, but the vitamin E stabilized HXLPE seems to be the most forgiving material when it comes to implant mal-orientation. © 2014 Wiley Periodicals, Inc. J Biomed Mater Res Part B, 102B: 1627–1638, 2014.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.