Publication detail

The effect of lubricant constituents on lubrication mechanisms in hip joint replacements

NEČAS, D. VRBKA, M. URBAN, F. KŘUPKA, I. HARTL, M.

Original Title

The effect of lubricant constituents on lubrication mechanisms in hip joint replacements

Type

journal article in Web of Science

Language

English

Original Abstract

The aim of the present paper is to provide a novel experimental approach enabling to assess the thickness of lubricant film within hip prostheses in meaning of the contribution of particular proteins. Thin film colorimetric interferometry was combined with fluorescent microscopy finding that a combination of optical methods can help to better understand the interfacial lubrication processes in hip replacements. The contact of metal femoral head against a glass disc was investigated under various operating conditions. As a test lubricant, the saline solution containing the albumin and γ-globulin in a concentration 2:1 was employed. Two different mean speeds were applied, 5.7 and 22 mm/s, respectively. The measurements were carried out under pure rolling, partial negative and partial positive sliding conditions showing that kinematic conditions substantially affects the formation of protein film. Under pure rolling conditions, an increasing tendency of lubricant film independently on rolling speed was detected, while the total thickness of lubricant film can be attributed mainly to albumin. When the ball was faster than the disc (negative sliding), a very thin lubricant film was observed for lower speed with no significant effect of particular proteins. The increase in sliding speed led to the increase of film thickness mainly caused due to the presence of γ-globulin. On the contrary, when the disc was faster than the ball (positive sliding), the film formation was very complex and time dependent while both of the studied proteins have shown any qualitative change during the test, however the effect of albumin seems to be much more important. Since a very good agreement of the results was obtained, it can be concluded that the approach consisting of two optical methods can provide the fundamental information about the lubricant film formation in meaning of particular proteins while the simultaneous presence of other constituents in model synovial fluid.

Keywords

Hip replacement; Fluorescent microscopy; Colorimetric interferometry; Albumin; γ-globulin; Lubricant film thickness

Authors

NEČAS, D.; VRBKA, M.; URBAN, F.; KŘUPKA, I.; HARTL, M.

Released

1. 3. 2016

Publisher

Elsevier Ltd.

Location

United Kingdom

ISBN

1751-6161

Periodical

Journal of the mechanical behavior of biomedical materials

Year of study

55

Number

3

State

Kingdom of the Netherlands

Pages from

295

Pages to

307

Pages count

13

URL

http://www.sciencedirect.com/science/article/pii/S1751616115004245

BibTex

@article{BUT118456,
  author="David {Nečas} and Martin {Vrbka} and Filip {Urban} and Ivan {Křupka} and Martin {Hartl}",
  title="The effect of lubricant constituents on lubrication mechanisms in hip joint replacements",
  journal="Journal of the mechanical behavior of biomedical materials",
  year="2016",
  volume="55",
  number="3",
  pages="295--307",
  doi="10.1016/j.jmbbm.2015.11.006",
  issn="1751-6161",
  url="http://www.sciencedirect.com/science/article/pii/S1751616115004245"
}