Publication detail

Mechanical Wear and Oxidative Degradation Analysis of Retrieved Ultra High Molecular Weight Polyethylene Acetabular Cups

CHOUDHURY, D. RANUŠA, M. FLEMING, R. A. VRBKA, M. KŘUPKA, I. TEETER M. G. GOSS, J. ZOU, M.

English title

Mechanical Wear and Oxidative Degradation Analysis of Retrieved Ultra High Molecular Weight Polyethylene Acetabular Cups

Type

journal article in Web of Science

Language

en

Original abstract

The number of revision joint replacements has been increasing substantially over the last few years. Understanding their failure mechanism is extremely important for improving the design and material selection of current implants. This study includes ten retrieved and four new mildly cross-linked ultra-high molecular weight polyethylene (UHMWPE) acetabular liners. Among them, most of the prostheses (n=5) were reported to be revised and replaced due to aseptic loosening, followed by painful joint (n=2), dislocation (n=1), and intra articular ossification (n=1) and combination of wear (liner) and osteolysis (stem). Surface deviations (wear, material inflation and roughness), oxidative degradation and change of material properties were measured using micro-computer topography (micro-CT) scan, 3D laser scanning microscopy, Raman spectroscopy and nanoindentation, respectively. Prostheses having eccentric worn areas had much higher linear wear rates (228.011 ± 35.51 µm/year) compared to that of centrically worn prostheses (96.706 ± 10.83 µm/year). Oxidation index (OI) showed similar trends to the surface penetration depth. Among them, sample 10 exhibited the highest OI across the contact area and the rim of the cup liners. It also had the lowest hardness/elasticity ratio. Overall, wear and creep, oxidative degradation and reduced hardness/elasticity ratio all contributed to the premature failure of the UHMWPE acetabular cup liners.

English abstract

The number of revision joint replacements has been increasing substantially over the last few years. Understanding their failure mechanism is extremely important for improving the design and material selection of current implants. This study includes ten retrieved and four new mildly cross-linked ultra-high molecular weight polyethylene (UHMWPE) acetabular liners. Among them, most of the prostheses (n=5) were reported to be revised and replaced due to aseptic loosening, followed by painful joint (n=2), dislocation (n=1), and intra articular ossification (n=1) and combination of wear (liner) and osteolysis (stem). Surface deviations (wear, material inflation and roughness), oxidative degradation and change of material properties were measured using micro-computer topography (micro-CT) scan, 3D laser scanning microscopy, Raman spectroscopy and nanoindentation, respectively. Prostheses having eccentric worn areas had much higher linear wear rates (228.011 ± 35.51 µm/year) compared to that of centrically worn prostheses (96.706 ± 10.83 µm/year). Oxidation index (OI) showed similar trends to the surface penetration depth. Among them, sample 10 exhibited the highest OI across the contact area and the rim of the cup liners. It also had the lowest hardness/elasticity ratio. Overall, wear and creep, oxidative degradation and reduced hardness/elasticity ratio all contributed to the premature failure of the UHMWPE acetabular cup liners.

Keywords in English

Retrieved prosthesis, Wear, Oxidative degradation, plasticity index, micro-CT, Raman spectroscopy, nanoindentation

Released

06.01.2018

Publisher

Elsevier

Location

Nizozemsko

ISSN

1751-6161

Volume

79

Number

1

Pages from–to

314–323

Pages count

10

BIBTEX


@article{BUT144870,
  author="Matúš {Ranuša} and Martin {Vrbka} and Ivan {Křupka},
  title="Mechanical Wear and Oxidative Degradation Analysis of Retrieved Ultra High Molecular Weight Polyethylene Acetabular Cups",
  year="2018",
  volume="79",
  number="1",
  month="January",
  pages="314--323",
  publisher="Elsevier",
  address="Nizozemsko",
  issn="1751-6161"
}