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Clinical Orthopaedics and Related Research®

Published in:

01-01-2011 | Symposium: Papers Presented at the Annual Meetings of the Knee Society

Wear Damage in Mobile-bearing TKA is as Severe as That in Fixed-bearing TKA

Authors: Natalie H. Kelly, BS, Rose H. Fu, BS, Timothy M. Wright, PhD, Douglas E. Padgett, MD

Published in: Clinical Orthopaedics and Related Research® | Issue 1/2011

Abstract

Background

Mobile-bearing TKAs reportedly have no clinical superiority over fixed-bearing TKAs, but a potential benefit is improved polyethylene wear behavior.

Questions/purposes

We asked whether extent of damage and wear patterns would be less severe on retrieved mobile-bearing TKAs than on fixed-bearing TKAs and if correlations with patient demographics could explain differences in extent or locations of damage.

Methods

We performed damage grading and mapping of 48 mobile-bearing TKAs retrieved due to osteolysis/loosening, infection, stiffness, instability or malpositioning. Visual grading used stereomicroscopy to identify damage, and a grade was assigned based on extent and severity. Each damage mode was then mapped onto a photograph of the implant surface, and the area affected was calculated.

Results

Marked wear damage occurred on both surfaces, with burnishing, scratching, and pitting the dominant modes. Damage occurred over a large portion of both surfaces, exceeding the available articular borders in nearly 30% of implants. Wear of mobile-bearing surfaces included marked third-body debris. Damage on tibiofemoral and mobile-bearing surfaces was not correlated with patient BMI or component alignment. Damage on mobile-bearing surfaces was positively correlated with length of implantation and was greater in implants removed for osteolysis or instability than in those removed for stiffness or infection.

Conclusions

Each bearing surface in mobile-bearing implants was damaged to an extent similar to that in fixed-bearing implants, making the combined damage score higher than that for fixed-bearing implants. Mobile-bearing TKAs did not improve wear damage, providing another argument against the superiority of these implants over fixed-bearing implants.

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Title: Wear Damage in Mobile-bearing TKA is as Severe as That in Fixed-bearing TKA
Authors: Natalie H. Kelly, BS
Rose H. Fu, BS
Timothy M. Wright, PhD
Douglas E. Padgett, MD
Publication date: 01-01-2011
Publisher: Springer-Verlag
Published in: Clinical Orthopaedics and Related Research® / Issue 1/2011
Print ISSN: 0009-921X
Electronic ISSN: 1528-1132
DOI: https://doi.org/10.1007/s11999-010-1557-4

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Wear Damage in Mobile-bearing TKA is as Severe as That in Fixed-bearing TKA

Abstract

Background

Questions/purposes

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Questions/purposes

Methods

Results

Conclusions

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