Multiscale analyses reveal native-like lamellar bone repair and near perfect bone-contact with porous strontium-loaded bioactive glass

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Title: Multiscale analyses reveal native-like lamellar bone repair and near perfect bone-contact with porous strontium-loaded bioactive glass
Authors: Autefage, H
Allen, F
Tang, HM
Kallepitis, C
Gentleman, E
Reznikov, N
Nitiputri, K
Nommeots-Nomm, A
Young, G
Lee, PD
Pierce, BF
Wagermaier, W
Fratzl, P
Goodship, A
Jones, JR
Blunn, G
Stevens, M
Item Type: Journal Article
Abstract: The efficient healing of critical-sized bone defects using synthetic biomaterial-based strategies is promising but remains challenging as it requires the development of biomaterials that combine a 3D porous architecture and a robust biological activity. Bioactive glasses (BGs) are attractive candidates as they stimulate a biological response that favors osteogenesis and vascularization, but amorphous 3D porous BGs are difficult to produce because conventional compositions crystallize during processing. Here, we rationally designed a porous, strontium-releasing, bioactive glass-based scaffold (pSrBG) whose composition was tailored to deliver strontium and whose properties were optimized to retain an amorphous phase, induce tissue infiltration and encourage bone formation. The hypothesis was that it would allow the repair of a critical-sized defect in an ovine model with newly-formed bone exhibiting physiological matrix composition and structural architecture. Histological and histomorphometric analyses combined with indentation testing showed pSrBG encouraged near perfect bone-to-material contact and the formation of well-organized lamellar bone. Analysis of bone quality by a combination of Raman spectral imaging, small-angle X-ray scattering, X-ray fluorescence and focused ion beam-scanning electron microscopy demonstrated that the repaired tissue was akin to that of normal, healthy bone, and incorporated small amounts of strontium in the newly formed bone mineral. These data show the potential of pSrBG to induce an efficient repair of critical-sized bone defects and establish the importance of thorough multi-scale characterization in assessing biomaterial outcomes in large animal models.
Issue Date: 1-Jul-2019
Date of Acceptance: 22-Mar-2019
ISSN: 0142-9612
Publisher: Elsevier
Start Page: 152
End Page: 162
Journal / Book Title: Biomaterials
Volume: 209
Copyright Statement: © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (
Sponsor/Funder: Wellcome Trust
Wellcome Trust
Funder's Grant Number: 204834/Z/16/Z
Keywords: 3D porous bioactive glass
Critical-sized bone repair
Raman spectroscopy
Strontium-releasing materials
MD Multidisciplinary
Biomedical Engineering
Publication Status: Published
Online Publication Date: 2019-03-25
Appears in Collections:Faculty of Engineering
Faculty of Natural Sciences

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