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TECHNICAL PAPERS

Tribological and Nanomechanical Properties of Unmodified and Crosslinked Ultra-High Molecular Weight Polyethylene for Total Joint Replacements

[+] Author and Article Information
J. Zhou, A. Chakravartula, L. Pruitt

Department of Bioengineering

K. Komvopoulos

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Tribol 126(2), 386-394 (Apr 19, 2004) (9 pages) doi:10.1115/1.1611511 History: Received February 19, 2003; Revised July 21, 2003; Online April 19, 2004
Copyright © 2004 by ASME
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References

Figures

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Coefficient of friction versus sliding distance (cycles) of (a) unmodified (control) and (b) crosslinked (10 Mrad gamma radiation) UHMWPE pins slid against Co-Cr alloy in bovine serum preserved with 0.1 wt% sodium azide
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ESEM images of unmodified UHMWPE surfaces obtained before testing ((a) region I and (b) region II) and after testing ((c) region I and (d) region II). (Regions I and II correspond to the microtomed (smooth) and as-machined (rough) regions, respectively. The arrow in (c) and (d) indicates the sliding direction.)
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ESEM images of crosslinked UHMWPE surfaces obtained before testing ((a) region I and (b) region II) and after testing ((c) region I and (d) region II). (Regions I and II correspond to the microtomed (smooth) and as-machined (rough) regions, respectively. The arrow in (c) and (d) indicates the sliding direction.)
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Delamination particle on the worn surface of unmodified UHMWPE
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Cross-section TEM images of (a) unmodified and (b) crosslinked UHMWPE obtained before testing showing the presence of amorphous and crystalline (lamellae) domains
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Near-surface TEM image of crosslinked UHMWPE obtained after testing showing restricted molecular alignment within nanodomains
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Nanoindentation load versus depth response of (a) unmodified (control) and (b) crosslinked (10 Mrad gamma radiation) UHMWPE
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Elastic stiffness versus depth response of (a) unmodified (control) and (b) crosslinked (10 Mrad gamma radiation) UHMWPE
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Surface images of residual impressions on unmodified (left column) and crosslinked (right column, 10 Mrad gamma radiation) UHMWPE produced with maximurn indentation load equal to (a) and (d) 1 mN, (b) and (e) 5 mN, and (c) and (f) 10 mN
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Change of indentation volume (creep) versus maximum indentation load for unmodified (control) and crosslinked (10 Mrad gamma radiation) UHMWPE
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Variation of adhesion force with maximum indentation load for unmodified (control) and crosslinked (10 Mrad gamma radiation) UHMWPE

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