The Importance of Modeling Press-Fit to Accurately Evaluate Interfacial Micromotion as an Indicator of Primary Stability in Uncemented Arthroplasty

Joshua E Johnson; Nico Verdonschot; Dennis Janssen; Donald D Anderson

doi:10.1002/jor.70081

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The Importance of Modeling Press-Fit to Accurately Evaluate Interfacial Micromotion as an Indicator of Primary Stability in Uncemented Arthroplasty

Journal article

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The Importance of Modeling Press-Fit to Accurately Evaluate Interfacial Micromotion as an Indicator of Primary Stability in Uncemented Arthroplasty

Joshua E Johnson, Nico Verdonschot, Dennis Janssen and Donald D Anderson

Journal of orthopaedic research, Vol.44(2), e70081

02/2026

DOI: 10.1002/jor.70081

PMCID: PMC12862519

PMID: 41063630

Appears in UI Libraries Support Open Access

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Abstract

Arthroplasty is most often performed to alleviate pain and restore function in patients with end-stage degenerative joint disease. Uncemented implant fixation is increasingly used in total knee and total ankle arthroplasty. Implantation using interference press-fit is a manufacturer-recommended guideline for achieving stable primary fixation in uncemented applications, which is important to prevent long-term implant failure due to aseptic loosening. However, when evaluating implant-bone interfacial mechanics, many studies have not modeled press-fit implantation. This can lead to gross underestimation of primary implant fixation stability, limiting the clinical applicability of findings. The goal of this paper is to highlight the importance of simulating press-fit implantation when evaluating primary orthopedic implant stability using finite element analysis in uncemented arthroplasty. Experiences gained in modeling press-fit implantation in total knee and total ankle arthroplasty by two different active research groups are shared in this context.

interfacial micromotions

uncemented arthroplasty

interference press?fit

plastic bone deformation

primary implant stability

UIOWA OA Agreement

Details

Title: Subtitle: The Importance of Modeling Press-Fit to Accurately Evaluate Interfacial Micromotion as an Indicator of Primary Stability in Uncemented Arthroplasty
Creators: Joshua E Johnson - University of Iowa
Nico Verdonschot - Radboud University Nijmegen
Dennis Janssen - Radboud University Nijmegen
Donald D Anderson - University of Iowa
Resource Type: Journal article
Publication Details: Journal of orthopaedic research, Vol.44(2), e70081
DOI: 10.1002/jor.70081
PMID: 41063630
PMCID: PMC12862519
NLM abbreviation: J Orthop Res
ISSN: 1554-527X
eISSN: 1554-527X
Publisher: Wiley
Grant note: Joshua E. Johnson and Donald D. Anderson: funding provided by Paragon 28, as were the patient CT scans and implant geometries.
Language: English
Electronic publication date: 10/09/2025
Date published: 02/2026
Academic Unit: Roy J. Carver Department of Biomedical Engineering; Orthopedics and Rehabilitation; Industrial and Systems Engineering
Record Identifier: 9985014896402771

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