Publication detail

Enhanced lubricant film formation through micro-dimpled hard-on-hard artificial hip joint: An in-situ observation of dimple shape effects

CHOUDHURY, D. REBENDA, D. SASAKI, S. HEKRLE, P. VRBKA, M. ZOU, M.

Original Title

Enhanced lubricant film formation through micro-dimpled hard-on-hard artificial hip joint: An in-situ observation of dimple shape effects

Type

journal article in Web of Science

Language

English

Original Abstract

This study evaluates the impact of dimple shapes on lubricant film formation in artificial hip joints. Micro-dimples with 20–50 µm lateral size and 1 ± 0.2 µm depths were fabricated on CrCoMo hip joint femoral heads using a picosecond laser. Tribological studies were performed using a pendulum hip joint simulator to apply continuous swing flexion–extension motions. The results revealed a significantly enhanced lubricant film thickness (≥ 500 nm) with micro-dimpled prosthesis heads at equilibrium position after the lubricant film has fully developed. The average lubricant film thickness of dimpled prostheses with square- and triangular-shaped dimple arrays over time is about 3.5 that of the non-dimpled prosthesis (204 nm). Remarkably, the prosthesis with square-shaped dimple arrays showed a very fast lubricant film formation reaching their peak values within 0.5 s of pendulum movement, followed by prosthesis with triangular-shaped dimple arrays with a transition period of 42.4 s. The fully developed lubricant film thicknesses (≥ 700 nm) are significantly higher than the surface roughness (≈ 25 nm) demonstrating a hydrodynamic lubrication. Hardly any scratches appeared on the post-experimental prosthesis with square-shaped dimple array and only a few scratches were found on the post-experimental prosthesis with triangular-shaped dimple arrays. Thus, prostheses with square-shaped dimple arrays could be a potential solution for durable artificial hip joints.

Keywords

Lubricant film formation; Micro-dimple; Artificial hip joints; in-situ; Lubrication

Authors

CHOUDHURY, D.; REBENDA, D.; SASAKI, S.; HEKRLE, P.; VRBKA, M.; ZOU, M.

Released

1. 5. 2018

Publisher

Elsevier B.V.

Location

Radarweg 29, 1043 NX Amsterdam, The Netherlands

ISBN

1751-6161

Periodical

Journal of the mechanical behavior of biomedical materials

Year of study

81

Number

5

State

Kingdom of the Netherlands

Pages from

120

Pages to

129

Pages count

10

URL

https://www.sciencedirect.com/science/article/pii/S1751616118301231?via%3Dihub

BibTex

@article{BUT146334,
  author="CHOUDHURY, D. and REBENDA, D. and SASAKI, S. and HEKRLE, P. and VRBKA, M. and ZOU, M.",
  title="Enhanced lubricant film formation through micro-dimpled hard-on-hard artificial hip joint: An in-situ observation of dimple shape effects",
  journal="Journal of the mechanical behavior of biomedical materials",
  year="2018",
  volume="81",
  number="5",
  pages="120--129",
  doi="10.1016/j.jmbbm.2018.02.014",
  issn="1751-6161",
  url="https://www.sciencedirect.com/science/article/pii/S1751616118301231?via%3Dihub"
}