Lattice implants that generate homeostatic and remodeling strains in bone
Author(s)
Munford, Max
Xiao, Dannier
Jeffers, Jonathan
Type
Journal Article
Abstract
Bone remodeling is mediated by several factors including strain. An increase in strain between 1% and 10% compared to homeostasis can trigger bone formation. We aim to create an orthopedic implant using clinically established imaging and manufacturing methods that induces this strain control in human bone. Titanium scaffolds were manufactured with multiaxial apparent modulus tailored to the mechanical properties of bone defined from computed tomography scans of cadaver human tibiae. Five bone cubes were tested with corresponding titanium scaffolds by loading under compression, which is similar to the implanted tibia loading condition. Bone strain was precisely controlled by varying the scaffold modulus, from 0% to 15% bone strain increase. This strain increase is the magnitude reported to invoke bone's positive remodeling. Axial modulus was closely matched between titanium scaffolds and bone, ranging from 48–728 and 81–800 MPa, respectively, whereby scaffold axial modulus was within 2% of nominal target values. Fine control of multiaxial moduli resulted in transverse modulus that matched bone well; ranging from 42–648 and 47–585 MPa in scaffolds and bone respectively. The scaffold manufacturing material and method are already used in the orthopedic industry. This study has significant clinical implications as it enables the design of implants which positively harness bone's natural mechanoresponse and respect bone's mechanical anisotropy and heterogeneity.
Date Issued
2022-04
Date Acceptance
2021-05-31
Citation
Journal of Orthopaedic Research, 2022, 40 (4), pp.871-877
ISSN
0736-0266
Publisher
Wiley
Start Page
871
End Page
877
Journal / Book Title
Journal of Orthopaedic Research
Volume
40
Issue
4
Copyright Statement
© 2021 The Authors. Journal of Orthopaedic Research® published by Wiley Periodicals LLC on behalf of 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.
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 (EPSRC)
Engineering & Physical Science Research Council (E
Wellcome Trust
Engineering & Physical Science Research Council (EPSRC)
National Institute for Health Research
Identifier
https://onlinelibrary.wiley.com/doi/10.1002/jor.25114
Grant Number
EP/K027549/1
EP/R511547/1
208858/Z/17/Z
EP/R042721/1
NIHR300013
Subjects
Science & Technology
Life Sciences & Biomedicine
Orthopedics
bone
mechanobiology
porous scaffold
strain control
MECHANICAL-PROPERTIES
MICROSTRUCTURE
REGENERATION
STIFFNESS
SCAFFOLDS
BEHAVIOR
DENSITY
bone
mechanobiology
porous scaffold
strain control
Orthopedics
0903 Biomedical Engineering
1103 Clinical Sciences
1106 Human Movement and Sports Sciences
Publication Status
Published
Date Publish Online
2021-06-04