Micromotion and Push‐Out Evaluation of an Additive Manufactured Implant for Above‐the‐Knee Amputees
Author(s)
Barnes, Spencer
Clasper, Jon
Bull, Anthony
Jeffers, Jonathan
Type
Journal Article
Abstract
In comparison to through knee amputees the outcomes for above‐the‐knee amputees are relatively poor; based on this novel techniques have been developed. Most current percutaneous implant based solutions for transfemoral amputees make use of high stiffness intramedullary rods for skeletal fixation which can have risks including infection, femoral fractures and bone resorption due to stress shielding. This work details the cadaveric testing of a short, cortical bone stiffness matched subcutaneous implant, produced using additive manufacture, to determine bone implant micromotion and push out load. The results for the micromotions were all less than 20 microns and the mean push out load was 2099 Newtons. In comparison to a solid control, the stiffness matched implant exhibited significantly higher micromotion distributions and no significant difference in terms of push out load. These results suggest that, for the stiffness matched implant at time zero, osseointegration would be facilitated and that the implant would be securely anchored. For these metrics, this provides justification for the use of a short stem implant for transfemoral amputees in this subcutaneous application.
Date Issued
2019-10
Date Acceptance
2019-05-28
Citation
Journal of Orthopaedic Research, 2019, 37 (10), pp.2104-2111
ISSN
0736-0266
Publisher
Wiley
Start Page
2104
End Page
2111
Journal / Book Title
Journal of Orthopaedic Research
Volume
37
Issue
10
Copyright Statement
This article is protected by copyright. All rights reserved. This is the post-peer reviewed version of the following article: Barnes, S. C., Clasper, J. C., Bull, A. M. and Jeffers, J. R. (2019), Micromotion and Push Out Evaluation of an Additive Manufactured Implant for Above‐the‐Knee Amputees. J. Orthop. Res. Accepted Author Manuscript. doi:10.1002/jor.24389, which has been published in final form at https://dx.doi.org/10.1002/jor.24389
Sponsor
The Royal British Legion
Engineering & Physical Science Research Council (EPSRC)
National Institute for Health Research
Wellcome Trust
Engineering & Physical Science Research Council (EPSRC)
The Royal British Legion
Grant Number
Centre for Blast Injury Studie
EP/K027549/1
GHR Project: 16/137/45
208858/Z/17/Z
EP/R042721/1
BMPF_P60304
Subjects
Science & Technology
Life Sciences & Biomedicine
Orthopedics
above-the-knee amputation
implant
additive manufacture
micromotion
osseointegration
QUALITY-OF-LIFE
TRANSFEMORAL AMPUTATION
SCANNING STRATEGIES
LASER PARAMETERS
FEMORAL STEM
BONE
SYSTEM
STIFFNESS
FIXATION
TITANIUM
above-the-knee amputation
additive manufacture
implant
micromotion
osseointegration
0903 Biomedical Engineering
1103 Clinical Sciences
1106 Human Movement and Sports Sciences
Orthopedics
Publication Status
Published
Date Publish Online
2019-06-21