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Changes in surface topography at the TKA backside articulation following in vivo service: a retrieval analysis

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

With the advent of modular total knee arthroplasty (TKA) systems, backside wear at the articulation between the ultra-high-molecular-weight-polyethylene (UHMWPE) component undersurface and the tibial baseplate has received increasing attention as a source of clinically significant polyethylene wear debris. The aim of this study was to investigate the reciprocating interface at the TKA undersurface articulation using profilometry after in vivo service. Our null hypothesis was that there would be no discernible pattern or relationship between the metal tibial baseplate and UHMWPE surface profile.

Methods

A nanoscale analysis of thirty retrieved fixed-bearing TKA explants was performed. Surface roughness (Sa) and skewness (Ssk) were measured on both the UHMWPE component undersurface and the tibial baseplate of explants using a non-contacting profilometer (1 nm resolution). Four pristine unimplanted components of two different designs (Stryker Kinemax and DePuy PFC) were examined for control purposes.

Results

Mean explant baseplate surface roughness was 1.24 μm (0.04–3.01 μm). Mean explant UHMWPE undersurface roughness was 1.16 μm (0.23–2.44 μm). Each explant had an individual roughness pattern with unique baseplate and undersurface UHMWPE surface roughness that was different from, but closely related to, surface topography observed in control implants of the same manufacturer and design. Following in vivo service, UHMWPE undersurface showed changes towards a negative skewness, demonstrating that wear is occurring at the backside interface.

Conclusion

In vivo loading of the TKA prosthesis leads to measurable changes in surface profile at the backside articulation, which appear to be dependent on several factors including implant design and in vivo duration. These findings are consistent with wear occurring at this surface. Findings of this study would support the use of a polished tibial tray over an unpolished design in total knee arthroplasty with the goal of reducing PE wear by means of providing a smoother backside countersurface for the UHMWPE component.

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Acknowledgments

We acknowledge Golara Jalalpour for her assistance in preparing images.

Conflict of interest

Each author certifies that he or she has no commercial associations (e.g. consultancies, stock ownership, equity interest, patent/licensing arrangements, etc.) that might pose a conflict of interest in connection with the submitted article.

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Authors and Affiliations

  1. Newcastle Upon Tyne Hospitals Trust, Royal Victoria Infirmary & Freeman Hospital, Newcastle upon Tyne, NE1 4LP, UK

    Richard J. Holleyman, David Weir, Jim Holland & David J. Deehan

  2. Newcastle University, Newcastle upon Tyne, UK

    Richard J. Holleyman, Susan C. Scholes, Tom J. Joyce & David J. Deehan

  3. University Hospital of North Durham, Durham, UK

    Simon S. Jameson

Authors
  1. Richard J. Holleyman
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  2. Susan C. Scholes
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  3. David Weir
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  4. Simon S. Jameson
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  5. Jim Holland
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  6. Tom J. Joyce
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  7. David J. Deehan
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Correspondence to Richard J. Holleyman.

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Holleyman, R.J., Scholes, S.C., Weir, D. et al. Changes in surface topography at the TKA backside articulation following in vivo service: a retrieval analysis. Knee Surg Sports Traumatol Arthrosc 23, 3523–3531 (2015). https://doi.org/10.1007/s00167-014-3197-9

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  • DOI: https://doi.org/10.1007/s00167-014-3197-9

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