Publication detail

On the observation of lubrication mechanisms within hip joint replacements. Part II: Hard-on-hard bearing pairs

NEČAS, D. VRBKA, M. GALLO, J. KŘUPKA, I. HARTL, M.

Original Title

On the observation of lubrication mechanisms within hip joint replacements. Part II: Hard-on-hard bearing pairs

Type

journal article in Web of Science

Language

English

Original Abstract

The present paper represents Part II of the extensive study focused on the lubrication of hip joint replacements. The main goal is to assess the fundamentals of lubrication considering both hard-on-soft (Part I) and hard-on-hard (Part II) bearing pairs. In addition, the effect of individual constituents contained in the model fluid is clarified. For this purpose, multiple model fluids of various composition were employed. In this part of the study, metal-on-glass contact representing hard bearing pairs was observed in situ using pendulum hip joint simulator in combination with thin film colorimetric interferometry method. The designed test consists of initial static loading/unloading phase for the determination of adsorption of molecules on rubbing surfaces. This period is followed by swinging of the pendulum and latest static part under constant load. Three groups of measurements were carried out while fourteen different lubricants were tested. Initially, the experiments were performed with albumin-based model fluid. In that case a substantial positive effect of hyaluronic acid was identified. In contrast, the fluids with γ-globulin as a base constituent showed improved lubrication conditions when phospholipids were added to the solution. Finally, considering the complex fluid, a combined effect of hyaluronic acid and phospholipids caused a better endurance of the lubricant film. The latest part of the paper aims on the comparison of film formation considering hard and soft pairs, highlighting some clear differences. In general, hard pairs exhibit clear decreasing tendency of the film during swinging motion while opposite behaviour was observed for soft pairs.

Keywords

Hip joint replacements; Hard-on-hard pairs; Lubrication; Optical interferometry; Synovial fluid

Authors

NEČAS, D.; VRBKA, M.; GALLO, J.; KŘUPKA, I.; HARTL, M.

Released

1. 1. 2019

Publisher

Elsevier

Location

Nizozemsko

ISBN

1751-6161

Periodical

Journal of the mechanical behavior of biomedical materials

Year of study

89

Number

1

State

Kingdom of the Netherlands

Pages from

249

Pages to

259

Pages count

11

URL

https://www.sciencedirect.com/science/article/pii/S1751616118310294

BibTex

@article{BUT150451,
  author="NEČAS, D. and VRBKA, M. and GALLO, J. and KŘUPKA, I. and HARTL, M.",
  title="On the observation of lubrication mechanisms within hip joint replacements. Part II: Hard-on-hard bearing pairs",
  journal="Journal of the mechanical behavior of biomedical materials",
  year="2019",
  volume="89",
  number="1",
  pages="249--259",
  doi="10.1016/j.jmbbm.2018.09.026",
  issn="1751-6161",
  url="https://www.sciencedirect.com/science/article/pii/S1751616118310294"
}