SYMPOSIA PAPER Published: 01 January 1998

Clinical Wear Performance of Metal-on-Metal Hip Arthroplasties


Thirty old (1st generation) Cobalt-Chromium metal-on-metal (Müller design) hip components and 83 new (2nd generation) Cobalt-Chromium metal-on-metal (METASUL™ design) hip components were examined for their in-vivo wear behaviour. The in-vivo wear behaviour of these retrievals was compared with their in-vitro wear behaviour. A running-in period of about one year is observed where the in-vivo wear rate for the whole bearing is approximately 25 μm/year. After this running-in period, the measured in-vivo wear rate of the whole bearing decreases to about 5 μm/year. A very good consistency is found between the in-vitro and in-vivo wear rate. The examination of the wear pattern shows abrasive wear for all the prostheses and some adhesive-fatigue wear areas for 10 per cent of the prostheses. The observed wear rate is independent of the wear mechanisms.

The metal-on-metal bearing can be considered as a very low wear articulation system.

Author Information

Rieker, CB
Sulzer Orthopedics, Winterthur, Switzerland
Köttig, P
Sulzer Orthopedics, Winterthur, Switzerland
Schön, R
Sulzer Orthopedics, Winterthur, Switzerland
Windler, M
Sulzer Orthopedics, Winterthur, Switzerland
Wyss, UP
Sulzer Orthopedics, Winterthur, Switzerland
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Developed by Committee: F04
Pages: 144–156
DOI: 10.1520/STP12836S
ISBN-EB: 978-0-8031-5391-2
ISBN-13: 978-0-8031-2490-5