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The Journal of Hip Surgery 2020; 4(04): 158-165
DOI: 10.1055/s-0040-1716576
Original Article

Are the Wear and Osteolysis Outcomes Different between Annealed and Remelted First-Generation Highly Crosslinked Polyethylene after Long-Term Implantation?

Autor*innen

  • Jaclyn T. Schachtner

    1   Department of Biomedical Engineering, Exponent Inc., Philadelphia, Pennsylvania

  • Daniel W. MacDonald 

    2   Implant Research Core, Drexel University School of Biomedical Engineering Science and Health Systems, Philadelphia, Pennsylvania

  • Gregg R. Klein

    3   Department of Orthopaedic Surgery, Rothman Institute, Montvale, New Jersey

  • Arthur L. Malkani 

    4   Department of Orthopedics, University of Louisville, Louisville, Kentucky

  • Matthew Kraay

    5   Department of Orthopaedics, University Hospitals Cleveland Medical Center, Cleveland, Ohio

  • Clare M. Rimnac

    6   Center for the Evaluation of Implant Performance, Case Western Reserve University Case School of Engineering, Cleveland, Ohio

  • Michael A. Mont

    7   Department of Orthopaedic Surgery, Lenox Hill Hospital at Northwell Health, New York City, New York

  • Gwo-Chin Lee

    8   Department of Orthopaedic Surgery, Penn Presbyterian Medical Center, Philadelphia, Pennsylvania

  • Steven Michael Kurtz

    1   Department of Biomedical Engineering, Exponent Inc., Philadelphia, Pennsylvania
    2   Implant Research Core, Drexel University School of Biomedical Engineering Science and Health Systems, Philadelphia, Pennsylvania

Funding This study was supported by the U.S. Department of Health and Human Services, National Institutes of Health, National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01 AR47904).
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Abstract

First-generation highly crosslinked polyethylene (HXLPE) was developed to reduce polyethylene wear debris and subsequent osteolysis. Two thermal stabilization strategies were developed, annealing and remelting, to remove free radicals remaining in the polymer. Both types of HXLPEs have demonstrated better wear resistance to conventional polyethylene in hip arthroplasty. However, few studies have directly compared the mid- to long-term clinical outcomes of first-generation HXLPEs. We sought to address the following research questions: (1) is there a difference between the revision reasons for HXLPE formulations (annealed and remelted), (2) is there a difference in oxidation between annealed and remelted HXLPEs, (3) is there a difference in the linear penetration rate of annealed and remelted HXLPEs, and (4) does the formulation of first-generation HXLPEs affect the prevalence of osteolysis? A total of 129 first-generation HXLPE acetabular liners were collected in a multicenter retrieval program. These components were implanted for 5 or more years and were fabricated from annealed or remelted HXLPE. Reasons for revision, body mass index, age, sex, and activity levels were collected from medical records. Oxidation was measured at four regions of interest: bearing surface, backside surface, locking mechanism, and rim. Liner penetration was directly measured from retrievals using a micrometer. Osteolysis was reported in the operative notes by the revising surgeon and a thorough review of the operative notes and radiographs. Revision reasons included infection, instability, pain, and loosening. The annealed liners had higher oxidation indices than remelted liners. There was no difference in linear penetration rates between cohorts. There was no difference in osteolysis prevalence between cohorts. We found remelted HXLPE to be more oxidatively stable than annealed HXLPE but did not find a significant difference in the linear penetration rates or the prevalence of osteolysis. Our findings demonstrate sustained long-term wear resistance of both cohorts of HXLPE. We did not find evidence to support a long-term clinical difference between the formulations of HXLPE.

Keywords

first-generation HXLPE - osteolysis - wear - total hip arthroplasty - oxidation


Publikationsverlauf

Eingereicht: 15. Mai 2020

Angenommen: 21. Juli 2020

Artikel online veröffentlicht:
17. September 2020

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