Technical Brief

An Investigation of the Geometric and Surface Finish Features of Co–Cr–Mo Hip Taper Junction Designs1

[+] Author and Article Information
Oleg Vesnovsky, Matthew A. Di Prima

U.S. Food and Drug Administration,
Silver Spring, MD 20993

L. D. Timmie Topoleski

U.S. Food and Drug Administration,
Silver Spring, MD 20993;
University of Maryland–Baltimore County,
Baltimore, MD 21250

Paul Kovacs

Electrochemistry/Biocompatibility Consultant,
Santa Claus, IN 47579

DOI: 10.1115/1.4033735Manuscript received March 1, 2016; final manuscript received March 16, 2016; published online August 1, 2016. Editor: William Durfee.

J. Med. Devices 10(3), 030907 (Aug 01, 2016) (3 pages) Paper No: MED-16-1078; doi: 10.1115/1.4033735 History: Received March 01, 2016; Revised March 16, 2016

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Di Prima, M. , Vesnovsky, O. , Kovacs, P. , Hopper, R. , Ho, H. , Engh, C. , and Topoleski, T. , 2015, “ Comparison of Visual Assessment Techniques for Wear/Corrosion in Modular Hip Replacement Systems,” Modularity and Tapers in Total Joint Replacement Devices (STP 1591), ASTM International, West Conshohocken, PA, pp. 147–163.
Richter, H. G. , Willmann, G. , Wimmer, M. , and Osthues, F. , 1997, “ Influence of the Ball/Stem-Interface on the Load Bearing Capability of Modular Total Hip Endoprostheses,” Modularity of Orthopedic Implants (STP 1301), ASTM International, West Conshohocken, PA, pp. 127–136.
Jani, S. , Sauer, W. , McLean, T. , Lambert, R. , and Kovacs, P. , 1997, “ Fretting Corrosion Mechanisms at Modular Implant Interfaces,” Modularity of Orthopedic Implants (STP 1301), ASTM International, West Conshohocken, PA, pp. 211–225.


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Fig. 1

Experimental setups for fatigue tests (a) and displacement measurements (b)

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Fig. 2

Combined use of digital microscopy and optical profilometry to assess surface features of matched taper–trunnion couples post fatigue testing

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Fig. 3

Results of profilometry and optical imaging

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Fig. 4

Results of micromotion measured by the top and bottom extensometers

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Fig. 5

Micromotion—cycle test examples

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Fig. 6

Separation force and ion concentration results



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