Short-term Wear Evaluation of Thin Acetabular Liners on 36-mm Femoral Heads View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2014-02

AUTHORS

Aaron J. Johnson, LaQuawn Loving, Lizeth Herrera, Ronald E. Delanois, Aiguo Wang, Michael A. Mont

ABSTRACT

BACKGROUND: Dislocation remains the leading cause of revision THA. One approach to decreasing prosthetic dislocation risk has been the use of larger femoral head component sizes. The upper limit of head size in metal-on-polyethylene hip arthroplasty has historically been limited because of concerns about increased wear on thin polyethylene components. It is not known to what degree this concern should apply to more wear-resistant polyethylene components. QUESTIONS/PURPOSES: We therefore determined (1) in vitro wear rates of polyethylene liners of varying thicknesses, (2) whether there were differences in the microscopic wear characteristics as a function of polyethylene thickness, and (3) whether thin polyethylene components resulted in early catastrophic failures. METHODS: We used a hip wear simulator to compare the wear performance of 12 highly crosslinked polyethylene acetabular inserts. The internal diameter of all components was 36 mm, and there were three samples tested of each thickness (1.9, 3.9, 5.9, or 7.9 mm). Testing was conducted for 2.4 million cycles. Gravimetric mass loss was converted to volumetric loss, which was subsequently converted to theoretical linear penetration rates. RESULTS: Wear rates decreased with increasing polyethylene thickness. Mean ± SD wear rates for the 1.9-, 3.9-, 5.9-, and 7.9-mm groups were 5.0 ± 0.5, 3.2 ± 0.3, 2.5 ± 1.1, and 2.2 ± 1.3 mm(3)/million cycles, respectively (p < 0.016). Calculated penetration rates were 0.015, 0.012, 0.011, and 0.010 mm/million cycles, respectively (p < 0.016). There were no catastrophic failures in any group. CONCLUSIONS: Thinner polyethylene components demonstrated higher wear rates, although even the highest wear rate observed in the thinnest polyethylene specimen was lower than that commonly reported for noncrosslinked polyethylene components. While encouraging, these findings should be validated in vivo before clinical recommendations can be made. More... »

PAGES

624-629

References to SciGraph publications

  • 2012-06. Second-generation Annealed Highly Cross-linked Polyethylene Exhibits Low Wear in CLINICAL ORTHOPAEDICS AND RELATED RESEARCH®
  • 2010-12. Highly Crosslinked Polyethylene Reduces Wear in Total Hip Arthroplasty at 5 Years in CLINICAL ORTHOPAEDICS AND RELATED RESEARCH®
  • 2010-10. Second-generation Highly Cross-linked X3™ Polyethylene Wear: A Preliminary Radiostereometric Analysis Study in CLINICAL ORTHOPAEDICS AND RELATED RESEARCH®
  • 2011-03. Continued Improved Wear with an Annealed Highly Cross-linked Polyethylene in CLINICAL ORTHOPAEDICS AND RELATED RESEARCH®
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s11999-013-3153-x

    DOI

    http://dx.doi.org/10.1007/s11999-013-3153-x

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1020880923

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/23861047


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