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.

English title

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

Type

WoS Article

Language

en

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 in English

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

Released

2018-05-01

Publisher

Elsevier B.V.

Location

Radarweg 29, 1043 NX Amsterdam, The Netherlands

ISSN

1751-6161

Journal

Journal of the Mechanical Behavior of Biomedical Materials

Volume

81

Number

5

Pages from–to

120–129

Pages count

10

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"
}