✦ LIBER ✦

Histological and mechanical comparison of hydroxyapatite-coated cobalt-chrome and titanium implants in the rabbit femur

✍ Scribed by Richard J. Friedman; Thomas W. Bauer; Kamil Garg; Ming Jiang; Yuehuei H. An; Robert A. Draughn

Publisher: Wiley (John Wiley & Sons)
Year: 1995
Tongue: English
Weight: 779 KB
Volume: 6
Category: Article
ISSN: 1045-4861
DOI: 10.1002/jab.770060403

No coin nor oath required. For personal study only.

✦ Synopsis

The purpose of this study was to compare hydroxyapatite (HA)-coated titanium (Ti) and HAcoated cobalt-chrome (CoCr) implants in the distal femur of the rabbit by evaluating bone apposition and interfacial shear strength. Bilateral cylindrical implants with a plasma sprayed 50-jm thick HA coating were press-fit into the metaphyseal cancellous bone of the lateral femoral condyles in a transverse fashion, and the animals were sacrificed at 2,4, and 8 weeks postimplantation. Mechanical strength of the interface between HA and bone was measured using the pushout method. For histologic analysis, the fractional linear extent of bone apposition was quantitated. No differences were found in the interfacial shear strength between the Ti and CoCr at any time period. The amount of bone apposition increased significantly at each time interval for both substrate metals, but there were no significant differences between the two substrates at any of the time periods studied. The HA-coated CoCr implants performed in a similar manner to the HA-coated Ti implants, both mechanically and histologically, suggesting that HA-coated CoCr implants deserve further study as a viable alternative to Ti for the biological fixation of total joint components in orthopaedic surgery. 0 1995 John Wiley & Sons, Inc.

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