期刊
WEAR
卷 315, 期 1-2, 页码 51-57出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2014.04.001
关键词
Prosthetic hip joint; Friction; Polyethylene; Microtexture; Laser surface texturing
资金
- NSF [1227869]
- NIH [1R41AR064095-01]
- University of Utah Technology Commercialization grant
- Undergraduate Research Opportunity (UROP) award from the University of Utah
- Society of Tribologists and Lubrication Engineers (STLE) E.R. Booser Presidential Award
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1227869] Funding Source: National Science Foundation
More than 285,000 total hip replacement surgeries are performed in the US each year. Most prosthetic hip joints consist of a cobalt-chromium (CoCr) femoral head that articulates with a polyethylene acetabular component, lubricated with synovial fluid. The statistical survivorship of these metal-on-polyethylene prosthetic hip joints declines significantly after 10-15 years of use, primarily as a result of polyethylene wear and wear debris incited disease. The current engineering paradigm to increase the longevity of prosthetic hip joints is to improve the mechanical properties of the polyethylene component, and to manufacture ultra-smooth articulating surfaces. In contrast, we show that adding a patterned microtexture to the ultra-smooth CoCr femoral head reduces friction when articulating with the polyethylene acetabular liner. The microtexture increases the load-carrying capacity and the thickness of the joint lubricant film, which reduces contact between the articulating surfaces. As a result, friction and wear is reduced. We have used a lubrication model to design the geometry of the patterned microtexture, and experimentally demonstrate reduced friction for the microtextured compared to conventional smooth surrogate prosthetic hip joints. (C) 2014 Elsevier B.V. All rights reserved.
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