Additive manufactured push-fit implant fixation with screw-strength pull out
File(s)
Published version
Author(s)
van Arkel, R
Ghouse, S
Milner, P
Jeffers, J
Type
Journal Article
Abstract
Additive manufacturing offers exciting new possibilities for improving long-term metallic implant fixation in bone through enabling open porous structures for bony ingrowth. The aim of this research was to investigate how the technology could also improve initial fixation, a precursor to successful long-term fixation. A new barbed fixation mechanism, relying on flexible struts was proposed and manufactured as a push-fit peg. The technology was optimized using a synthetic bone model and compared with conventional press-fit peg controls tested over a range of interference fits. Optimum designs, achieving maximum pull-out force, were subsequently tested in a cadaveric femoral condyle model. The barbed fixation surface provided more than double the pull-out force for less than a third of the insertion force compared to the best performing conventional press-fit peg (p < 0.001). Indeed, it provided screw-strength pull out from a push-fit device (1,124 ± 146 N). This step change in implant fixation potential offers new capabilities for low profile, minimally invasive implant design, while providing new options to simplify surgery, allowing for one-piece push-fit components with high levels of initial stability.
Date Issued
2018-05-01
Date Acceptance
2017-10-01
Citation
Journal of Orthopaedic Research, 2018, 36 (5), pp.1508-1518
ISSN
0736-0266
Publisher
Wiley
Start Page
1508
End Page
1518
Journal / Book Title
Journal of Orthopaedic Research
Volume
36
Issue
5
Copyright Statement
© 2017 The Authors. Journal of Orthopaedic Research Published by WileyPeriodicals, Inc. on behalf of the Orthopaedic Research Society. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
Sponsor
Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Imperial College London
Identifier
https://onlinelibrary.wiley.com/doi/full/10.1002/jor.23771
Grant Number
EP/K503733/1
EP/K027549/1
Additive Manufacturing Network
Subjects
Science & Technology
Life Sciences & Biomedicine
Orthopedics
initial implant stability
press-fit
minimally invasive implants
porous implants
3D printing
CEMENTLESS ORTHOPEDIC IMPLANTS
CANCELLOUS BONE SCREWS
MECHANICAL-PROPERTIES
SURFACE ARCHITECTURE
POROUS BIOMATERIALS
TITANIUM IMPLANTS
HIP-ARTHROPLASTY
TISSUE-RESPONSE
TRABECULAR BONE
IN-VIVO
3D printing
initial implant stability
minimally invasive implants
porous implants
press-fit
Adult
Bone Screws
Humans
Male
Middle Aged
Orthopedic Procedures
Porosity
Prostheses and Implants
Humans
Orthopedic Procedures
Prostheses and Implants
Bone Screws
Porosity
Adult
Middle Aged
Male
0903 Biomedical Engineering
1103 Clinical Sciences
1106 Human Movement and Sports Sciences
Orthopedics
Publication Status
Published
Date Publish Online
2017-10-11