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Long-term osseointegration of 3D printed CoCr constructs with an interconnected open-pore architecture prepared by electron beam melting.

Journal article
Authors Furqan A. Shah
Omar Omar
Felicia Suska
Anders Snis
Aleksandar Matic
Lena Emanuelsson
Birgitta Norlindh
Jukka Lausmaa
Peter Thomsen
Anders Palmquist
Published in Acta Biomaterialia
Volume 36
Issue May
Pages 296-309
ISSN 1742-7061
Publication year 2016
Published at Institute of Clinical Sciences, Department of Biomaterials
Pages 296-309
Language en
Links dx.doi.org/10.1016/j.actbio.2016.03...
Keywords 3D printing, Additive manufacturing, Electron beam melting, Osseointegration, Alloy, Cobalt chromium, Titanium
Subject categories Biomaterials

Abstract

In orthopaedic surgery, cobalt chromium (CoCr) based alloys are used extensively for their high strength and wear properties, but with concerns over stress shielding and bone resorption due to the high stiffness of CoCr. The structural stiffness, principally related to the bulk and the elastic modulus of the material, may be lowered by appropriate design modifications, to reduce the stiffness mismatch between metal/alloy implants and the adjacent bone. Here, 3D printed CoCr and Ti6Al4V implants of similar macro-geometry and interconnected open-pore architecture prepared by electron beam melting (EBM) were evaluated following 26week implantation in adult sheep femora. Despite higher total bone-implant contact for Ti6Al4V (39±4%) than CoCr (27±4%), bone formation patterns were similar, e.g., densification around the implant, and gradual ingrowth into the porous network, with more bone in the outer half (periphery) than the inner half (centre). Raman spectroscopy revealed no major differences in mineral crystallinity, the apatite-to-collagen ratio, or the carbonate-to-phosphate ratio. Energy dispersive X-ray spectroscopy showed similar Ca/P ratio of the interfacial tissue adjacent to both materials. Osteocytes made direct contact with CoCr and Ti6Al4V. While osteocyte density and distribution in the new-formed bone were largely similar for the two alloys, higher osteocyte density was observed at the periphery of the porous network for CoCr, attributable to slower remodelling and a different biomechanical environment. The results demonstrate the possibility to achieve bone ingrowth into open-pore CoCr constructs, and attest to the potential for fabricating customised osseointegrated CoCr implants for load-bearing applications.

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