Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Biomaterials
Abstract number: 25392
WEAR BEHAVIOR OF AMC CERAMICS ON PE IN HIP PROSTHESES
Bernard MASSON
CeramTec, Vieille Toulouse (FRANCE)
The introduction of ceramics in total hip arthroplasty contributed significantly to the
wear reduction of polyethylene. This great benefit has been demonstrated by Dahl,
showing that the wear of a 28mm alumina is considerably reduced compare to a
CrCo ball head against Ultra High Molecular Weight Polyethylene (UHMWPE) after
10 years. A first prospective, randomized study with a 15 years follow up compare
the wear of polyethylene between alumina and metal ball head. A reduction of 44%
penetration (linear wear) with the alumina-polyethylene bearing surface is
demonstrated. In order to improve mechanical resistance, a new generation of
alumina matrix composite (BIOLOX®delta) has been used in Orthopaedics since
2001.The topic of this study is to demonstrate the excellent wear performance of the
alumina ceramic composite against polyethylene, compared to alumina/PE in vivo.
The BIOLOX®delta-PE bearing has been tested on a six station hip simulator. After 5
million cycles, the wear rates calculated by linear interpolation were 13,52 mg per
million cycles. When comparing the results for BIOLOX®forte on polyethylene with
the same 28mm diameter and same testing parameter, we observed 26,57 mg/Mc.
The BIOLOX®delta on UHMWPE bearing shows improved wear behavior with a
much lower wear rate. Based on this results and the clinical performance of the
alumina-UHMPE bearing from the literature, we can expect a further reduction of
wear for the BIOLOX®delta on UHMWPE in vivo that will increase the survival rate of
the total hip arthroplasty.
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